Re: [Emc-users] Reverse Pulse Control on Dust Collectors

[N. Christopher Perry]

I think that would be an excellent use for an Arduino.  

N. Christopher Perry

> On Aug 22, 2023, at 1:01 PM, John Dammeyer  wrote:
> 
> I tried to send some python source code, an xml and text file as
> attachments, both as the files and in a zip and got the attachment
> blacklisted reply.  Is there another way so everyone on the list can get the
> attachment.  I can put it on my web site but eventually it will disappear
> rather than end up in archives.
> 
> John Dammeyer
> 
>> -Original Message-
>> From: Earl Weaver [mailto:weaverst...@frontier.com]
>> Sent: August 22, 2023 8:41 AM
>> To: emc-users@lists.sourceforge.net
>> Subject: [Emc-users] Reverse Pulse Control on Dust Collectors
>> 
>> Hi everyone,
>> 
>> Does anyone have suggestions what would be a good option
>> for reverse pulse control on my dust collectors?
>> 
>> I have 3 separate dust collectors that use (two each) air solenoid valves
>> to give the filters an alternating 100 millisecond (1/10 second) pulse
>> to remove the dust from the filters.
>> I have solid state switch relays (triac) to pulse the 120 volt AC
>> solenoid valves.
>> 
>> I already have this setup on my LinuxCNC Plasma cutter and have it
>> working with ClassicLadder in LinuxCNC.
>> It seems somewhat overkill to use a full LinuxCNC setup to control these
>> other three dust collectors.
>> 
>> Would a micro-controller like Arduino be a better solution?
>> I have no experience with Arduino.
>> 
>> What about a PLC?
>> 
>> Any input, or suggestions?
>> 
>> Thanks,
>> Earl
>> --
>> 
>> 
>> 
>> 
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Re: [Emc-users] R2E3 retrofit

[N. Christopher Perry]

That’s great to hear Gene.  I’ve daughter thats on the spectrum, which 
constantly worries me.  You’re son’s story strengthens my hope for her.

N. Christopher Perry

> On Jul 2, 2022, at 8:32 AM, gene heskett  wrote:
> 
> On 7/1/22 23:53, Stuart Stevenson wrote:
>> Before - way before - My parents were told by the school I couldn't hear
>> when I was in the 4th grade.
>> No one knew I couldn't hear well. I have learned to cope pretty well.
>> Sometimes, when I 'hear' something I will realize I felt the vibrations on
>> my skin.
> My youngest boy was born deaf. Our clue was that when he was about
> crawling age, he would sit and scream on a concrete floor while playing
> happily on a wood floor. We knew is stomach wasn't right as he lived
> for about the first 5 years on a predigested formula called Neutramagen.
> We hauled him to Mayo and were told his deafness wasn't fixable.
> 
> But time was on our side, and one day when he was about 5 he looked
> up at a piper J3, and said "airplane" as he pointed up.  He finally started
> tolerating normal food in another year.  Mayo said he is a miracle. Today
> he's about 42, and the very well paid head of the maintenance dept at
> a packing plant in south eastern Nebraska, eats anything put in front of
> him and hears better than I do at 87. And I give thanks for that miracle.
> 
> My boys, the 4 that survive, are all doing well.
>>> On Fri, Jul 1, 2022 at 8:06 PM andy pugh  wrote:
>>> 
>>> On Sat, 2 Jul 2022 at 01:46, Stuart Stevenson  wrote:
>>>> oh yeah? with being totally deaf in my left ear and 60% loss in my right
>>>> ear I never heard anything like that!
>>> Before or after the Dah-Lih?
>>> 
>>> --
>>> atp
>>> "A motorcycle is a bicycle with a pandemonium attachment and is
>>> designed for the especial use of mechanical geniuses, daredevils and
>>> lunatics."
>>> — George Fitch, Atlanta Constitution Newspaper, 1912
>>> 
>>> 
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>> 
> 
> 
> Cheers, Gene Heskett.
> -- 
> "There are four boxes to be used in defense of liberty:
> soap, ballot, jury, and ammo. Please use in that order."
> -Ed Howdershelt (Author, 1940)
> If we desire respect for the law, we must first make the law respectable.
> - Louis D. Brandeis
> Genes Web page <http://geneslinuxbox.net:6309/>
> 
> 
> 
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Re: [Emc-users] Something went wrong.

[N. Christopher Perry]

I’d try the operations in the opposite order and see what happens…. 

I’ve seen more subtle things like this before and chocked it up to part flex, 
but what you’ve got there is too extreme to believe it could be simply flex.

N. Christopher Perry

> On Aug 2, 2021, at 1:10 PM, John Dammeyer  wrote:
> 
> Same tool for both inner hole and outer profile.  
> Same feeds and speeds and conventional, not climb milling.
> G40  -- No compensation.
> Only I,J in the file with a G17 preceding them.
> 
> I could hide it considering what it's for and that no one will see it.  But 
> that's not really the point.  I'd know. 
> 
> Will try it again today this time with entry exit for each pass rather than 
> just the first and last.
> 
> John
> 
>> -Original Message-
>> From: Ralph Stirling [mailto:ralph.stirl...@wallawalla.edu]
>> Sent: August-02-21 8:12 AM
>> To: Enhanced Machine Controller (EMC)
>> Subject: Re: [Emc-users] Something went wrong.
>> 
>> To elaborate a little more, your description sounds a bit like G42 cutter 
>> compensation, described in
>> https://linuxcnc.org/docs/2.8/html/gcode/tool-compensation.html .
>> 
>> -- Ralph
>> 
>> On Aug 2, 2021 6:12 AM, Ralph Stirling  wrote:
>> CAUTION: This email originated from outside the Walla Walla University email 
>> system.
>> 
>> 
>> Cutter compensation enabled?
>> 
>> On Aug 1, 2021 7:26 PM, John Dammeyer  wrote:
>> CAUTION: This email originated from outside the Walla Walla University email 
>> system.
>> 
>> 
>> The milling operation was set up to always be climb milling. Zero point for 
>> the center hole and the outside perimeter was the same.
>> And yet it milled more away on the LH side.
>> 
>> The piece was tightly clamped and did not move.  The width of the perimeter 
>> on the RHS is correct with the outer diameter at 45mm
>> and the inner hole at 32.5mm.
>> 
>> ie. At the RHS it's 6.25mm wide and on the LHS it's 4mm so it's the milling 
>> of the outer that shifted.  The inner circle is pretty well
>> round.  Not as good as a boring tool but still round.
>> 
>> The inner hole was done after the outer perimeter.
>> 
>> Very odd and I don't understand why.  LinuxCNC and the motor drives did not 
>> throw up any faults.
>> S1100
>> Feed was 307mm/min with 1/4" 2 flute cutter.
>> Total depth was 3.2mm and depth per pass 0.9mm.
>> WD-40 and compressed air.
>> 
>> John
>> 
>> 
>> 
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Re: [Emc-users] Die guide post insertion/removal force

[N. Christopher Perry]

Nick,

You’re going to want to purchase new posts.  The are actually hardened and 
ground to two different diameters, undersize by a couple of tens for the 
bushings and 2-3 thou oversized for pressing into the stationary plate of the 
set.

I got mine here:  https://www.janesvilletool.com/C/156/StraightGuidePosts

N. Christopher Perry

> On Mar 24, 2021, at 3:26 PM, andy pugh  wrote:
> 
> On Wed, 24 Mar 2021 at 19:10, Nicklas SB Karlsson  wrote:
> 
>> for sheet metal bending tool but should work for the few parts I expect
>> to need. ...  bending tool will be used to make boxes
>> for my driver cards,
> 
> If I was making a sheet metal bender I would make an electromagnetic one.
> 
> http://aaybee.com.au/Magnabend/Magnabend_Homepage.html
> 
> (Note section 6 which tells you how to make one, if you don't want to
> buy a commercial one)
> 
> -- 
> atp
> "A motorcycle is a bicycle with a pandemonium attachment and is
> designed for the especial use of mechanical geniuses, daredevils and
> lunatics."
> — George Fitch, Atlanta Constitution Newspaper, 1912
> 
> 
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Re: [Emc-users] Die guide post insertion/removal force

[N. Christopher Perry]

I recently replaced the 1” diameter posts in a die set with a Harbor Freight 20 
ton press.  I used most of its grunt, but it worked fine! 

N. Christopher Perry

> On Mar 24, 2021, at 6:31 AM, andy pugh  wrote:
> 
> On Wed, 24 Mar 2021 at 05:13, Nicklas SB Karlsson  wrote:
>> 
>> Anybody have any idea about the insertion/removal force of die guide posts?
> 
> No.
> 
> Trying to work out what you are asking, it sounds like you might be
> planning to buy a hydraulic press, but do not know what force you
> need?
> 
> But if they are interference fit then it will depend on the degree of
> interference, so might be quite varied.
> You might be able to find rules of thumb for general interference fits
> and infer your requirements from that.
> 
> -- 
> atp
> "A motorcycle is a bicycle with a pandemonium attachment and is
> designed for the especial use of mechanical geniuses, daredevils and
> lunatics."
> — George Fitch, Atlanta Constitution Newspaper, 1912
> 
> 
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Re: [Emc-users] OT: pcb milling

[N. Christopher Perry]

I use this tape and live it: 
Polyken 108/NAT225 108

When you’re done machining it with alcohol and it lets go.

N. Christopher Perry

> On Mar 2, 2021, at 3:44 PM, Greg Bernard  wrote:
> 
> Looks interesting. I've used double sided tape to hold circuit boards and
> sheet aluminum but dealing with the adhesive residue can be a nuisance.
> 
> On Tue, Mar 2, 2021, 10:23 AM Roland Jollivet 
> wrote:
> 
>> Has anyone tried this for holding down PCB's when milling?
>> 
>> https://www.materialsampleshop.com/products/micro-suction-tape
>> 
>> Roland
>> 
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Re: [Emc-users] LinuxCNC 2.8.0 is released

[N. Christopher Perry]

You guys are awesome!  Thank you all!

N. Christopher Perry

> On Sep 8, 2020, at 9:34 PM, Gene Heskett  wrote:
> 
>> On Tuesday 08 September 2020 19:28:13 andy pugh wrote:
>> 
>> I am pleased (and a little relieved) to announce the release of
>> LinuxCNC v2.8.0
>> 
>> This release has been a long time in development. The main new
>> feature, the separation of joints (actuators) and (cartesian) axes has
>> been in development since around 2010.
>> 
>> This is one of the biggest updates to LinuxCNC ever. The changelog can
>> be viewed here:
>> https://github.com/LinuxCNC/linuxcnc/blob/2.8/debian/changelog
>> 
> Andy, we don't say it often enough.  Thank you.
> 
>> Highlights include:
>> 
>> * Joints-axes separation - mainly obvious as much better support for
>> gantries and their homing but also for robots and any other
>> non-cartesian system
>> * Reverse-run - negative feed-overide will now reverse along the
>> previous path - introduced for wire spark eroders, but I am sure you
>> will find other uses.
>> * Multiple spindle support - up to 9 spindles
>> * Tool table expanded to 1000 tools
>> * Packages available for Raspberry Pi 4.
>> * External offsets and Extra (not controlled by G-code) joints. -
>> G-code is not the only way to move things.
>> * QTvcp: New QT-based VCP framework
>> * QTdragon, QTlathe, QTtouchy, QTscreen - new GUIs based on QTVP
>> * Silverdragon: New gscreen based GUI
>> * plasmac: New full-featured Plasma cutter controller - with
>> integrated THC and a whole lot more.
>> * Massively expanded and improved Spanish translations of
>> documentation and manpages
>> * New Chinese translation of the "入门" (Getting Started) documentation.
>> 
>> Installable packages are available for Ubuntu Precise and Debians
>> Wheezy, Stretch, Jessie and Buster (including Raspbian). Support for
>> Ubuntu Lucid has ended.
>> At the moment most supported platforms only work with the preempt-rt
>> kernels. There is an experimental 64-bit RTAI kernel for those needing
>> it. We hope to mainline this soon, but help would be appreciated.
>> 
>> More details of how to update here:
>> http://linuxcnc.org/docs/2.8/html/getting-started/updating-linuxcnc.ht
>> ml
>> 
>> For new installations, or to test-run the new version and OS on your
>> existing hardware without committing to an OS upgrade use the ISO
>> images and process described here:
>> http://linuxcnc.org/docs/2.8/html/getting-started/getting-linuxcnc.htm
>> l
>> 
>> 
>> Many thanks to the following contributors, and to anyone else who has
>> submitted work or code to the project.
>> Alec Ari
>> Alexander Brock
>> Alex Joni
>> Alex Wigen
>> Al Smart
>> Andrea Ricchi
>> Andrew Kyrychenko
>> andypugh
>> Anthony Barney
>> Anton Midyukov
>> ascurtis
>> Balestrino
>> bebro
>> Bence Kovacs
>> Benjamin Brockhaus
>> Benjamin Weis
>> Bernhard M. Wiedemann
>> Bertho Stultiens
>> blazini36
>> Boris Skegin
>> Brian Hicks
>> cascade256
>> Chris Edwards
>> Chris Morley
>> Chris Radek
>> Colten Edwards
>> Curtis Dutton
>> Daniel Rogge
>> david
>> David Shore
>> Dewey Garrett
>> Eduard Kachur
>> Edward Tomasz Napierala
>> Ernesto Lo Valvo
>> Florian Kerle
>> Gergely Nagymate
>> Hannah Lau
>> Håvard Flaget Aasen
>> itai
>> itaib
>> James Waples
>> Jan Mrázek
>> jasen
>> Jeff Epler
>> Jim Craig
>> Jin
>> j.m. garcia
>> Joe Hildreth
>> John
>> John Kasunich
>> John Morris
>> John Thornton
>> Jon Elson
>> Kim Kirwan
>> Kurt Jacobson
>> Lars Bensmann
>> Les Newell
>> loopsun
>> Lorenz Neureuter
>> Lubomir Rintel
>> Luke Peterson
>> Mark Andrew Gerads
>> Markus
>> Mateusz Konieczny
>> Matsche
>> Michael Geszkiewicz
>> Michael Haberler
>> Mick
>> Moses McKnight
>> MrFouFou
>> Nicola Quargentan
>> Norbert Schechner
>> Oleg Pryadko
>> peter wallace
>> Phillip A Carter
>> Phillip Carter
>> pippin88
>> Rene Hopf
>> Rick M
>> Robert W. Ellenberg
>> rolf
>> Rudy du Preez
>> Ruoxi Wang
>> Rushabh Loladia
>> sam sokolik
>> Sam Sokolik
>> Sebastian Kuzminsky
>> Sergey Alirzaev
>> Solitarily
>> sphasse
>> Stephen Wille Padnos
>> Sync
>> Tero Kaarlela
>> Thomas Burkhard
>> To

Re: [Emc-users] missing feature of openscad

[N. Christopher Perry]

It’s common practice to have a fan on the ‘cold end’ of the print head to keep 
the heater and motor from prematurely softening the filament.

N. Christopher Perry

> On May 31, 2020, at 1:29 PM, Chris Albertson  
> wrote:
> 
> Use a metal hub on the gear, especially if it connects directly to a motor
> that gets hot.   The other thing is to use ABS plastic or maybe PET
> plastic.  PLA is easy to print but has the lowest melt temperature.
> 
> I had the idea the other day to make the metal gear hub extend well past
> the end of the motor shaft and then cut some groves so it might act as a
> heat sink.
> 
> You really have to measure the shaft temperature after an hour of warm-up.
> "Can't touch it" covers a wide range of temperatures.   it is had to keep
> your hand on an object that is just 60C but the PLA works well enough at
> 60C.  But 120C is to warm for PLA.
> 
> As I said earlier, with a gear r pulley, all the stress is on the hub, not
> the teeth so make the metal.  Tell you cad system you want (1) a 24mm hole
> and (2) a hub width about 2X the gear's face width.   This gives lots of
> plastic the metal surface area.   PLA is about 1/3rd as strong as metal so
> so a large diameter and wide design is correct.
> 
> As for dimensional accuracy.   Print a hockey puck that is about the size
> of the parts you want to make and measure the puck.  YOu only have to do
> this once for each plastic and print temperature. NOTE:  Write which
> way is X and which is Y on the puck before you remove it from the printer.
> Measure both X and Y and Z with calipers.
> 
> If the puck is monimally 100mm diameter when you drew it n the CAD system
> and prints are 99.5, you know then you have to make them 0.5% larger
> 
> The percent will change with size.   I assume no one prints solid plastic
> and we all use 15 to 50 percent infill.3D printed parts are not uniform
> material but a shell and infill.
> 
> 
> All that said, just ignore all this untill you can make everything work
> Pulleys and gears have teeth ad keep their ratio even if printed 2% wrong
> size.
> 
> 
> 
> 
>> On Sun, May 31, 2020 at 9:11 AM Martin Dobbins  wrote:
>> 
>> Caveats:
>> 
>> 1:I'm not a 3d printer user, but I may become one after reading this
>> thread: Thanks (I think)
>> 
>> 2:I have very little experience with Openscad.
>> 
>> Serve the required grains of salt with the following as required
>> 
>> Gene Heskett wrote:
>> 
>>> 1; Which is a measure of the OD of the rendered pulley, those areas of
>>> the preview gfx are blank, although the scale marks are there, they are
>>> drawn behind the sprocket image. so one could get a very rough idea of
>>> the total radius of the finished gear in mm.  Am I missing a font, or is
>>> this a more serious concern that will need me to make the gear before I
>>> can determine how it fits?
>> 
>> Melted plastic contracts as it cools, so getting something on size is an
>> iterative process
>> 
>> Print, measure, calculate percentage shrinkage and reprint that percentage
>> oversize.  I understand that most slicer
>> 
>> software includes an easy way of doing this (at least I hope so). Rinse
>> and repeat to get something that meets
>> 
>> tolerances.  I don't know the answer to the openscad rendering question,
>> but don't you have the parameter values
>> 
>> for everything drawn?
>> 
>> 
>>> 2; This motor runs uncomfortably hot, and I've not found anything to
>>> indicate the controller goes into a low current mode at balance, I left
>>> it running at about 1500 revs for half an hour and cannot lay a hand on
>>> it to pick it up, and an extended stop didn't seem to cool it any, and
>>> since that heat will telegraph up the  motors 8mm shaft to the PLA, is
>>> this going to be a life of the sprocket limiting factor because the PLA
>>> will soften and eventually cold flow to a loose and likely out of
>>> concentricity warpage?
>> 
>> That's something that you can figure out now, melt temperature and (I just
>> found out from the link below)
>> 
>> glass transition temperature 111 to 145F.  Can you squeeze a metallic hub
>> in? Or maybe an aluminum heat sink
>> 
>> on the shaft between the motor and where the gear will sit?
>> 
>> 
>> https://www.creativemechanisms.com/blog/learn-about-polylactic-acid-pla-prototypes
>> 
>> 
>>> 3; I have the pi3b I took off the Sheldon, and another of those 5v5a
>>> supplies, and I've downloaded the octo-pi image that includes that
>

Re: [Emc-users] Timing belts?

[N. Christopher Perry]

The GT3 is a great profile to use.

N. Christopher Perry

> On May 11, 2020, at 2:07 PM, Chris Albertson  
> wrote:
> 
> I'm doing a new design CNC build.   I will be using timing belts and
> medium-size (NEMA 23 and 34) stepper motors.
> 
> Question: What tooth profile is the best to use?   The goal would be
> minimum backlash then things like noise and belt wear.   I can choose
> anything I want because this is for a new machine.
> 
> From my reading, I think the Gates GT3 profile, with 3mm pitch is the
> current best belt type.   Yes I know many mills work fine with HTD or
> XL or even v-belts.
> -- 
> 
> Chris Albertson
> Redondo Beach, California
> 
> 
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Re: [Emc-users] Spindle Speed Control.

[N. Christopher Perry]

>> 
>>> If you are controlling the speed of your spindle with LinuxCNC instead of
>>> just ON/OFF/DIR, how are you doing this?
>>> 
>>> Step/Dir?
>>> 
>>> 0V-10V PWM?

I’m using PWM with a direct signal and enable.My drive accepts 0-10V, so I 
created a little board that converts the PWN to a 0-10V analog signal and 
isolates all the signals.

N. Christopher Perry

>>> 
>>> ModBus?
>>> If ModBus RS232 or RS485?
>>> 
>>> Some other way?
>>> 
>>> Thanks
>>> John
>>> 
>>> 
>>> "ELS! Nothing else works as well for your Lathe"
>>> Automation Artisans Inc.
>>> www dot autoartisans dot com
>>> 
>>> 
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Re: [Emc-users] Dropbox

[N. Christopher Perry]

On Mar 9, 2019, at 3:13 PM, Chris Albertson  wrote:
> 
> I think Iceweasel is the default web browser. 

Iceweasel chokes when I got to the Dropbox sight.

> When using older OS
> on low powered hardware, stick with defaults.  But I think you can get
> Firefox to work but why?
> 
> 
> On Sat, Mar 9, 2019 at 11:40 AM N. Christopher Perry
>  wrote:
>> 
>> 
>>> On Mar 9, 2019, at 2:16 PM, Chris Albertson  
>>> wrote:
>>> 
>>> Use the web interface to DropBox.  Then no software needs to be installed
>> 
>> What browser do you recommend?  Chrome doesn’t seem to like Wheezy.
>>> 
>>> If you aretrying to move files to the machine, use an NFS mount as it is
>>> very reliable and 100X faster.
>>> 
>>> 
>>> On Sat, Mar 9, 2019 at 10:50 AM N. Christopher Perry 
>>> wrote:
>>> 
>>>> I finally upgraded to 2.7 / Debian Wheezy and am trying to get Dropbox to
>>>> work on it.  When I install any of the packages from the Dropbox sight I
>>>> ether get dependency problems or after starting it the task crashes.
>>>> Anybody got suggestions?
>>>> 
>>>> N. Christopher Perry
>>>> 
>>>> 
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>>> 
>>> 
>>> --
>>> 
>>> Chris Albertson
>>> Redondo Beach, California
>>> 
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> 
> 
> -- 
> 
> Chris Albertson
> Redondo Beach, California
> 
> 
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Re: [Emc-users] Dropbox

[N. Christopher Perry]

> On Mar 9, 2019, at 2:16 PM, Chris Albertson  wrote:
> 
> Use the web interface to DropBox.  Then no software needs to be installed

What browser do you recommend?  Chrome doesn’t seem to like Wheezy.
> 
> If you aretrying to move files to the machine, use an NFS mount as it is
> very reliable and 100X faster.
> 
> 
> On Sat, Mar 9, 2019 at 10:50 AM N. Christopher Perry 
> wrote:
> 
>> I finally upgraded to 2.7 / Debian Wheezy and am trying to get Dropbox to
>> work on it.  When I install any of the packages from the Dropbox sight I
>> ether get dependency problems or after starting it the task crashes.
>> Anybody got suggestions?
>> 
>> N. Christopher Perry
>> 
>> 
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> 
> -- 
> 
> Chris Albertson
> Redondo Beach, California
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[Emc-users] Dropbox

[N. Christopher Perry]

I finally upgraded to 2.7 / Debian Wheezy and am trying to get Dropbox to work 
on it.  When I install any of the packages from the Dropbox sight I ether get 
dependency problems or after starting it the task crashes.  Anybody got 
suggestions?

N. Christopher Perry


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Re: [Emc-users] Just in case anyone is interested in my tool changer...

[N. Christopher Perry]

Very neat!

N. Christopher Perry

> On Aug 28, 2018, at 2:06 AM, Marcus Bowman 
>  wrote:
> 
> 
>> On 27 Aug 2018, at 21:44, Les Newell wrote:
>> 
>> I uploaded a quick video of it in action <https://youtu.be/XI90PuKW6Mw>
>> 
> Nice action, and I like the logic for the tool length setting/not setting.
> 
> Marcus
> 
> 
> 
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Re: [Emc-users] How does this work?

[N. Christopher Perry]

> On May 20, 2018, at 7:44 AM, Ed  wrote:
> 
>> On 05/19/2018 08:58 PM, Dan Bloomquist wrote:
>> 
>> My son is looking at CNC mills. I cam across this one, and no, I don't think 
>> it suitable for him. He will really need a Haas class machine.
>> 
>> But I'm looking at the photos and I don't see any 'glass', feedback, like my 
>> mill. How does it work? I know those have to be servos, not steppers. Do 
>> they just encode on the drive shaft and consider that accurate enough?
>> 
>> 
>>  
>> 
>> Thanks, Dan. 
> 
> 
> Over priced by at least 4 times.
> 
>   That is a direct drive stepper motor machine with a completely obsolete 
> control and drivers and a "Dupont overhaul".
> 
> Ed.

I tend to agree.  I picked up BOSS 5 Bridgeport, pretty much the exact same 
config, with <1000 h on it for $500.

Way too much money for what you’d get.

N.C.
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Re: [Emc-users] Getting a burned up polygroove belt out of a motor pulley. Need chemist expert

[N. Christopher Perry]

> On Mar 21, 2018, at 9:13 PM, Gene Heskett <ghesk...@shentel.net> wrote:
> 
>> On Wednesday 21 March 2018 19:03:28 N. Christopher Perry wrote:
>> 
>> I’d pull the pulley off and through it into an over set to 450F for a
>> couple of hours.
>> 
>> N. Christopher Perry
> 
> So as not to stink up the house, would a $20 toaster oven do?  It goes up 
> to about 425F. It would stink up the garage instead that way.
> 
425 F might do it.  Alternately you could burn the crud off with a propane 
torch, then brush off the reside with a wire brush.

> But not till warmer weather as the saw is in an almost unheated shed and 
> it will take a bit of time as the lower drive wheel will need to come 
> off to gain good access to the motor pulley. The shed is not well 
> insulated, so I keep the heat set to just above the dew point to 
> discourage rust on the machinery in the winter. We're on the inside edge 
> of the current four-easter, and its a bit chilly out, and still snowing.
> 
> Thanks.
>> 
>>> On Mar 21, 2018, at 6:45 PM, Gene Heskett <ghesk...@shentel.net>
>>> wrote:
>>> 
>>> Greetings all;
>>> 
>>> I have a Rikon 10-325 bandsaw. Trying to cut a block of alu with a
>>> blade thats had one side of it dulled, the blade turned and bound in
>>> the cut, and burned the drive belt, a 240J into the motor pulley.
>>> Rather thoroughly welding the kevlar backing into the pulley.
>>> 
>>> Does anyone have a recipe for some panther piss that will clean it
>>> out, or am I stuck buying another pulley from Rikon's parts dept?
>>> 
>>> Thanks.
>>> 
>>> --
>>> Cheers, Gene Heskett
>>> --
>>> "There are four boxes to be used in defense of liberty:
>>> soap, ballot, jury, and ammo. Please use in that order."
>>> -Ed Howdershelt (Author)
>>> Genes Web page <http://geneslinuxbox.net:6309/gene>
>>> 
>>> 
>>> -- Check out the vibrant tech community on one of the world's
>>> most engaging tech sites, Slashdot.org! http://sdm.link/slashdot
>>> 
N. Christopher Perry

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Re: [Emc-users] Getting a burned up polygroove belt out of a motor pulley. Need chemist expert

[N. Christopher Perry]

I’d pull the pulley off and through it into an over set to 450F for a couple of 
hours.

N. Christopher Perry

> On Mar 21, 2018, at 6:45 PM, Gene Heskett <ghesk...@shentel.net> wrote:
> 
> Greetings all;
> 
> I have a Rikon 10-325 bandsaw. Trying to cut a block of alu with a blade 
> thats had one side of it dulled, the blade turned and bound in the cut, 
> and burned the drive belt, a 240J into the motor pulley. Rather 
> thoroughly welding the kevlar backing into the pulley.
> 
> Does anyone have a recipe for some panther piss that will clean it out, 
> or am I stuck buying another pulley from Rikon's parts dept?
> 
> Thanks.
> 
> -- 
> Cheers, Gene Heskett
> --
> "There are four boxes to be used in defense of liberty:
> soap, ballot, jury, and ammo. Please use in that order."
> -Ed Howdershelt (Author)
> Genes Web page <http://geneslinuxbox.net:6309/gene>
> 
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Re: [Emc-users] Need to select a timing belt type and size

[N. Christopher Perry]

> On Feb 22, 2018, at 12:27 PM, Chris Albertson <albertson.ch...@gmail.com> 
> wrote:
> 
> Andy,
> 
> That is what I'm making too.  A rotating ball nut.   I looked at all the
> ways there are to lift the head of a Siege X2 mini mill and I think the
> question comes down to the location of the screw.  I think I will use the
> space occupied by the factory installed column mounted rack.   The screw
> will be fixed to the head and lifted straight up by the rotating ball nut
> I'm using a 16mm dil x 2mm pitch screw.All other designs place a
> twisting force on the Z-axis dovetail
> 
> This belt will connect to a nut that looks like yours.But I read the
> belt literature and far and away the GT2 profiles seems best.   They are
> now calling it GT3 and say it interchanges with GT2 parts  The belt teeth
> are little semi circles.

The GT series all have effectively the same profile, just progressively better 
life / fatigue resistance.
> 
> My question was about pitch.  Should the belt pitch be 2mm, 3mm or 5mm.
> 
Any pitch that provide at least 7 teeth on the motor sprocket is acceptable, 
from a torque transmission / belt life stand point. On the other hand, the 
larger the pitch the higher the peak torque you can transmit.  I should think 3 
mm is the right compromise.

> So I look up technical data for the belts and each pitch has a minimum size
> pulley and different maximum RPMs.   Using 3mm pitch allows the motor to
> spin up to 5,000 RPM. I doubt I will run the stepper motor that fast
> 
>> 
N. Christopher Perry

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Re: [Emc-users] Need to select a timing belt type and size

[N. Christopher Perry]

> On Feb 18, 2018, at 6:53 PM, Chris Albertson  
> wrote:
> 
> Question:  What would be the preferred timing belt for a new design?
> 
> Here is the application.  I'm making a z-axis control for a Harbor Freight
> mini mill (Sieg X2).   In this design a 5/8 diameter, 0.200 pitch ball
> screw is fixed and the nut spins.  The nut is driven by a timing belt
> "about" 50 teeth and the motor has an about 25 tooth pulley.   I'm thinking
> a 400 in/oz. NEMA 23 stepper should work.Assuming the 2:1 reduction
> each 1.8 degree step lifts the head 0.0005 inches.  By 1/4 stepping I get
> 0.000125 per pulse.
> 
> When looking for a good design for the mini mill I was looking for a good
> place to put the ball screw.  This design places it very close to the dove
> tail, almost touching it.  Maybe 0.1 inch in front of the dovetail.  The
> ball screw goes right where the current rack it the original design.  I
> will have to remove the rack to fit the screw.
> 
> So I need to select a belt type and size.   My initial guess at this a the
> GT2, 3mm pitch and 9mm wide.
> 
I’ve used almost the same configuration on my scratch built mini-mill and it 
has worked fine for 8 years.  The GT2 belts are superior in most respects, 
particularly because they have an involute profile.  This reduces noise and 
increases effective stiffness.

> Some one else used a XL type 3/8 wide and 0.2 pitch but I'm reading that XL
> is not the best for new designs as GT2 has a much improved both profile
> that eliminates backlash.

The XL doesn’t really have backlash, but does have more compliance for a given 
belt tension, as the profile allows the teeth to generate higher separation 
loads which allow them to ‘ride up’ some under high loads.  As such, you end up 
needing higher tensions to transmit a given torque.

> 
> I started to calculate torque and load on the belt then thought "Why
> bother?" the actual force is going to be whatever the motor can do as I'll
> set the acceleration limits until it start skipping steps then back up by
> about 30% or so.   

The real reason to calculate the forces is to make sure you have sufficient 
static tension so that under max load the ‘slack’ side of the belt never 
actually goes slack.  If that happens the belt will unwrap from the slack side 
of the drive sprocket and might skip a tooth.  According to the literature, 
this represents a belt drive failure and will rapidly destroy a belt by 
overload the cords and breaking strands in them.  Broken strands lead to lose 
of tension, and the cycle rapidly repeats until the belt either looses sections 
of teeth or falls apart.

> I might go with a NEMA 34 1100 in/oz motor if I need
> to.  So I might choose a belt that can handle whatever the 1100 in/oz motor
> can do.   Just looking to double check GT2, 3mm pitch and 9mm wide is
> reasonable.
> 
> So I guess the best way to ask the question is what kind of belts are
> working well with motors in the 400 to 1100 in/oz. range.
> 
> If there is any interest I'm modeling this in Fusion 360.  and can share
> the CAD files
> 
> -- 
> 
> Chris Albertson
> Redondo Beach, California
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Re: [Emc-users] Tech Shop goes out of business

[N. Christopher Perry]

> On Nov 16, 2017, at 12:45 PM, John Kasunich <jmkasun...@fastmail.fm> wrote:

> 
>> On Thu, Nov 16, 2017, at 12:39 PM, John Kasunich wrote:
>> 
>>> On Thu, Nov 16, 2017, at 11:58 AM, Gene Heskett wrote:
>>>> On Wednesday 15 November 2017 23:38:46 Jon Elson wrote:
>>>> 
>>>> It seems that Tech Shop has gone out of business nationally.
>>>> 
>>>> Jon
>>> 
>>> That doesn't ring any bells here, Jon,  What sort of stuff did they sell?
>>> 
>> 
>> I think they didn't sell things.  They are/were a shop space where people 
>> would 
>> pay a membership fee for access to space, tools, etc.  Makerspace kind of 
>> thing.
>> 
> http://www.techshop.ws/techshop.pdf
> 
> -- 
>  John Kasunich
>  jmkasun...@fastmail.fm
> 
> 
That's disappointing...

N. Christopher Perry

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Re: [Emc-users] MachineKit on the BeagleBone Black

[N. Christopher Perry]

> On Oct 11, 2017, at 4:30 PM, Martin Dobbins <tu...@hotmail.com> wrote:
> 
> What it needs is money, unfortunately.
> 
> 
> The heavy lifting has already been done by the person who put together Path 
> Pilot, now it needs some people to turn Path Pilot into something that will 
> run on any machine that runs linuxcnc, not just a Tormach spec PC.  People 
> who use Windows based cnc control systems are willing to pay for a license to 
> do so, and willing to pay for hardware and software widgets that might make 
> life easier, this promotes a cottage industry of people who will supply that 
> same because they can make money doing so.
> 
> 
> I would be quite happy to pay for for an application like path pilot that 
> will run on any machine, but would  anyone else?
> 
I certainly would, as long as it didn't run into the many hundreds of dollars.
> 
> Martin
> 
N. Christopher Perry
> 
> 


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Re: [Emc-users] CNC Plasma Tube Notcher

[N. Christopher Perry]

> On Jun 16, 2017, at 12:50 AM, Kurt Jacobson <kurtcjacob...@gmail.com> wrote:
> 
> Hello all,
> 
> Some of the videos linked in the "LCNC TED Talk style" thread reminded me
> of a CNC plasma tubing notcher I designed and built a few years ago while I
> was in school. I think some of you might be interested.
> 
> As built the notcher has a capacity of 4". It consists of a rotating
> pneumatically actuated chuck and a horizontal linear axis that moves the
> torch to and fro along the axis of the tube.
> 
> The fab shop I designed the notcher for usually had the client provide them
> with CAD generated templates, so one of the goals of the project was to be
> able to scan in these templates and generate G-code so multiple notches
> could be cut. I used a simple probing sub and a fiber optic sensor in place
> of the plasma tourch to scan a template warped around a tube. This was slow
> but worked well and was reliable.
> 
> For cases were a template was not provided I wrote a small MATLAB program
> and GUI to generate the g-code given the joint parameters.
> 
> I initially used Mach3 for the control, but then I switched to GRBL with a
> custom interface so they would not have to keep a Win XP PC with parport
> around just to run the notcher. What I would love to do is rework it to
> have LinuxCNC on a BB or RPi on board with a small touch screen. It would
> be fairly easy to write a custom interface so machine control, template
> scanning and G-code generation could all be done from one interface.
> 
> 
> A google photo album of the notcher build:
> https://goo.gl/photos/RcgPV2fRfD5ChmQ39
> 
> 
> Early video of notcher in action:
> https://youtu.be/uZP3JNNKDLQ
> 
> Following a scanned template:
> https://youtu.be/DsCuw9TPBeY
> 
> Scanning a template:
> https://youtu.be/QfmZeYXlU6E
> 
> Chuck self centering small diameter:
> https://youtu.be/5S8kO3-p4vs
> 
> 
> TubeNotch MATLAB program:
> https://github.com/KurtJacobson/TubeNotch
> 
> 
> Regards,
> Kurt

That's some very nice work!

N. Christopher Perry 

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Re: [Emc-users] new thread inspired by Christophers question about 3d printer sliceing SW.

[N. Christopher Perry]

That is is impressive!

N. Christopher Perry

> On May 27, 2017, at 9:54 PM, andy pugh <bodge...@gmail.com> wrote:
> 
>> On 16 May 2017 at 14:27, Gene Heskett <ghesk...@shentel.net> wrote:
>> Has anyone put a printhead on a std moving table milling machine, and
>> used it to do some 3d additive printing?
> 
> 
> https://www.youtube.com/watch?v=NEyL6cVWlo4
> 
> So, it clearly can work.
> 
> -- 
> atp
> "A motorcycle is a bicycle with a pandemonium attachment and is
> designed for the especial use of mechanical geniuses, daredevils and
> lunatics."
> — George Fitch, Atlanta Constitution Newspaper, 1916
> 
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Re: [Emc-users] new thread inspired by Christophers question about 3d printer sliceing SW.

[N. Christopher Perry]

To answer Ken's question...

N. Christopher Perry

> On May 16, 2017, at 2:00 PM, Gene Heskett <ghesk...@shentel.net> wrote:
> 
> On Tuesday 16 May 2017 11:56:40 Ken Strauss wrote:
> 
>>> -Original Message-----
>>> From: N. Christopher Perry [mailto:vwpe...@comcast.net]
>>> Sent: Tuesday, May 16, 2017 10:07 AM
>>> To: Enhanced Machine Controller (EMC)
>>> Subject: Re: [Emc-users] new thread inspired by Christophers
>>> question
>> 
>> about
>> 
>>> 3d printer sliceing SW.
>>> 
>>> Gene,
>>> 
>>> Turns out that printing with a heavy machine like a mill presents
>>> some problems, as the inertia is orders of magnitude higher than on
>>> 3D
>> 
>> printers.
>> 
>>> 3D printers are designed to have as low an inertia as possible to
>>> simplify
>> 
>> the
>> 
>>> filament control dynamics.  With a larger/heavier machine those
>>> control dynamics get pretty complex as I understand it.  Plus, your
>>> prints would
>> 
>> take an
>> 
>>> eternity.
>>> 
>>> N. Christopher Perry
>> 
>> I certainly understand that a heavy mill may not be able to move as
>> fast as a very lightweight 3d printhead and printing may take a long
>> time. However, why would "filament control dynamics" be a problem?

As I understand it on, at least small hobby scale printers, the extruders don't 
exactly behave in linear manor during changes in their extrusion rate (your 
basically pushing a 'rope' into the extrusion chamber, and the rope isn't 
perfectly consistent in geometry or density).  They compensate for this with a 
variety of parameter like retraction on stop, etc.  When inertia of the system 
is small the start/stop transients are short enough that the filament 
controller can just about ignore small changes in the differential nozzle 
speed, reducing it to a nearly on/off control.  With slow accelerations you 
can't ignore the nonlinearities in the extruder and need a much broader range 
of control.

>> With the mill the table would be moving and the filament stationary
>> which should, if anything, make the problem simpler. What am I not
>> understanding? Or are you concerned about the movement of the object
>> being printed?
>> 
>> I have not experience with 3d printing. How fast do the typical
>> inexpensive 3d printers move?
>> 
> Pretty fast, Ken, when you can't see it move 4" in a u-tube movie.  Its 
> there, and in the next frame is a blur, and its there in the 3rd frame.
> 
> Even if my G0704 could do the Russian step dance, its still 10x slower 
> than that.  :(
>> 
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> 
> 
> Cheers, Gene Heskett
> -- 
> "There are four boxes to be used in defense of liberty:
> soap, ballot, jury, and ammo. Please use in that order."
> -Ed Howdershelt (Author)
> Genes Web page <http://geneslinuxbox.net:6309/gene>
> 
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Re: [Emc-users] Best cam linux/open for additive manufactory

[N. Christopher Perry]

This one gets very good reviews:  https://craftunique.com/craftware

N. Christopher Perry

> On May 16, 2017, at 7:42 AM, giorgio foga <giorgiof...@hotmail.it> wrote:
> 
> Hi,
> 
> 
> anyone can suggest me a good cam for additive manufactoring .. (fdm) ... free 
> or payment not so important, but just need to install it on linux...
> 
> 
> regards
> 
> goirgio
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Re: [Emc-users] Milling Aluminum.

[N. Christopher Perry]

And I recommend 0.025" - 0.050" depth of cut.

N. Christopher Perry

> On Feb 21, 2017, at 11:53 AM, John Thornton <j...@gnipsel.com> wrote:
> 
> The key to milling aluminum dry is cutting a chip big enough to pull the 
> heat out with the chip. So big chips mean the part stays cool, and small 
> chips means the tool will gum up and stick the aluminum. I like 2 flute 
> carbide from Lakeshore Carbide. They make end mills for steel and 
> aluminum that have different coatings. Looking in the Lakeshore Carbide 
> book they recommend for aluminum 1600-2000 SFM ( I assume that is with 
> flood coolant) and 0.003" inches per tooth. Using my handy calculator 
> and using 1600 SFM for a 2 flute 1/4" end mill I get 26 RPM at 146.7 
> IPM.
> 
> JT
> 
> 
>> On 2/21/2017 9:34 AM, Todd Zuercher wrote:
>> I am a wood worker in a large wood working CNC shop. But I need to mill some 
>> aluminum for a project (a jig for another process in our company) but I know 
>> next to nothing about milling such material. What I need is to cut a large 
>> grid out of a 5ft x 10ft sheet of 1/4inch thick MIC6 AL. The machines I will 
>> have to do this are large wood working cncs with flat vacuum tables. We 
>> normally cut flat sheet material like MDF or plywood on a MDF fall-board 
>> (vacuum sucking right through the fall-board (holes, no jig tape, just 
>> porous MDF) These machines have no provisions for coolant Just compressed 
>> air blast and dust/chip collection (big centralized dust collector system). 
>> I will obviously have to disable the dust collection, because I'm pretty 
>> sure the local farmers who pick up our dust won't appreciate AL shavings in 
>> their cow bedding. The machine I am probably going to use has a 12kw 24krpm 
>> spindle. I would like to mill this with a 1/4" 2 flute carbide end mill. 
>> Should I use an up or dow
 n spiral cutter? What feed speed and RPM would be appropriate? What depth of 
cut per pass? Do I need to arrange some sort of mist system for cooling? What 
to use and how much liquid in the mist? (Don't want to cause problems with the 
MDF fall-board or vacuum hold down system.) The grid is only going to be about 
2 inches wide, with 12 windows in the 5x10 frame (a lot of wasted material). At 
this point the plan is to set the milling up with lots of bridges to hold the 
grid to the scrap then go back and trim those off with a final finish pass.
>> 
> 
> 
> 
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Re: [Emc-users] Probably stupid question.

[N. Christopher Perry]

I default to cobalt drills for most jobs.  They are more expensive, but I've 
never actually dulled one on anything less than a nasty SS.

N. Christopher Perry

> On Aug 12, 2016, at 6:59 PM, Dave Cole <linuxcncro...@gmail.com> wrote:
> 
> One propane torch (a good one) in a wind less area might be able to get 
> that dark red.
> You might need two propane torches to really get it into the red range.
> Do you happen to have a weed burner ?That would do it.
> I drill quite a bit of hot roll and don't have any issues.
> If you need some good drills which are pretty cheap, Ryobi drill bits 
> are sold at Home Depot and those are pretty good bits for what they charge.
> 
> Dave
> 
>> On 8/12/2016 5:31 PM, Ed wrote:
>>> On 08/12/2016 03:39 PM, Gene Heskett wrote:
>>>> On Friday 12 August 2016 14:24:19 Gene Heskett wrote:
>>>> 
>>>> Greetings all;
>>>> 
>>>> At what temp do I have to get a piece of hot roll to in order to
>>>> soften the ultra hard core of the steel?  Is it something this toaster
>>>> oven can achieve given enough soak time at about 425F?
>> 
>> 
>> Add about 1000 degrees F to that for an anneal.
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>>>> Doing the hole, which I haven't tapped yet, for the 4mm gib adjuster
>>>> screw last night, I started with a freshly DrillDoc sharpened quality
>>>> 3.44mm bit.
>> 
>> Drill Doctors are not a high quality or high accuracy sharpener but they
>> are handy. They are known to leave a "heel" behind the cutting edge,
>> that might be your problem, give it some more clearance behind the edge.
>> I wore one of them completely out and am working on another.
>> 
>> 
>> 
>> I had much the same problem building the front clamp.  Cold rolled
>> would work much easier, but I'd have to buy that online, whereas the
>> hot roll is in the bins at TSC.
>> 
>> 
>> 
>> Good hot rolled drills easier than CR, bad HR may have hard spots. I drill a 
>> LOT of both. If you have doubts about the quality cut part way through with 
>> a hacksaw and bend it, and look for an obvious change in texture
>> 
>> 
>> 
>> 
>>> I found a pdf, from ASM International, 18 pages describing in text and TT
>>> maps, what happens to steel as its heated and cooled.  But somehow I am
>>> failing to make the connection to the temp, time at temp, and cooling
>>> rate to get the easiest to machine finished piece.
>> 
>> 
>> For most low or medium carbon steel  heat to 1450F and cool in the
>> furnace or if no furnace bury it in Vermiculite insulation to cool to
>> under 100F
>> 
>> 
>> 
>> 
>> 
>>>   Thats ASM #05144G.
>>> The fact that the TSC stuff carries no label describing its alloying
>>> materials and percentages is also "missing" info.
>> Unless otherwise marked TSC steel is 1008 to 1018 steel alias A36.
>> 
>> 
>> 
>>> I know in the early '50's that making the stuff drillable for cotter keys
>>> in the ends of some 5/8" shafting about 15" long was a matter of heating
>>> them pretty bright red on the ends, and air cooling, but other than
>>> necks of ammo being annealed for reloading longevity, that is about the
>>> extent of my knowledge if you throw in what you can do to a puddle of
>>> steel with a smith wrench.  That is a whole science in and of itself.
>>> 
>>> So, some recommendations, particularly for just the maximum machining
>>> ductility, and how best to measure that temp on the cheap, would be much
>>> appreciated.
>> 
>> Heat with a torch to IHC tractor red and cool slowly, if you do not
>> prefer IHC then try Massey red.
>> 
>> 
>> Ed.
>> 
>> 
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Re: [Emc-users] ER-16 spindles

[N. Christopher Perry]

No problem!

I'm a little miffed that they came up with that mere months after I bought 
lathe.  Obviously I'll have to pick up one for myself too ;))

N. Christopher Perry

> On Jun 29, 2016, at 1:55 PM, Ralph Stirling <ralph.stirl...@wallawalla.edu> 
> wrote:
> 
> Thanks for reminding me of the Taig.  That is probably
> the best, simplest, and cheapest way for me to do what
> I want to do.
> 
> -- Ralph
> ________
> From: N. Christopher Perry [vwpe...@comcast.net]
> Sent: Wednesday, June 29, 2016 10:14 AM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] ER-16 spindles
> 
> Taig makes a ER-16 compatible headstock.
> 
> N. Christopher Perry
> 
>> On Jun 29, 2016, at 11:29 AM, Peter Blodow <p.blo...@dreki.de> wrote:
>> 
>> Being in possession of a lathe, I bought a set of cheap collets, a
>> special nut and a six-prong wrench to go with them and made my spindle
>> myself.
>> Peter
>> 
>> Am 29.06.2016 17:16, schrieb Ralph Stirling:
>>> Have any of you come across cheap collet spindles that
>>> have a through-bore?  I am toying with an idea for a
>>> simple, special-purpose lathe, and need a hollow spindle.
>>> 
>>> Thanks,
>>> -- Ralph
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Re: [Emc-users] ER-16 spindles

[N. Christopher Perry]

Taig makes a ER-16 compatible headstock.

N. Christopher Perry

> On Jun 29, 2016, at 11:29 AM, Peter Blodow <p.blo...@dreki.de> wrote:
> 
> Being in possession of a lathe, I bought a set of cheap collets, a 
> special nut and a six-prong wrench to go with them and made my spindle 
> myself.
> Peter
> 
> Am 29.06.2016 17:16, schrieb Ralph Stirling:
>> Have any of you come across cheap collet spindles that
>> have a through-bore?  I am toying with an idea for a
>> simple, special-purpose lathe, and need a hollow spindle.
>> 
>> Thanks,
>> -- Ralph
>> --
>> Attend Shape: An AT Tech Expo July 15-16. Meet us at AT Park in San
>> Francisco, CA to explore cutting-edge tech and listen to tech luminaries
>> present their vision of the future. This family event has something for
>> everyone, including kids. Get more information and register today.
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Re: [Emc-users] off topic free mechanical movement software simulation

[N. Christopher Perry]

Linden,

I'd probably start with Matlab or the open source version, Octave,  to work out 
the kinematics.  These numerical packages have some pretty powerful plotting 
and visualization tools that can be driven by numerical functions of your 
choosing.

Once you work out the basic geometry l'd move to Solid works, FreeCAD or 
Solvespace to work out the component geometry. 

N. Christopher Perry

> On Oct 24, 2015, at 9:19 AM, linden <l...@island.net> wrote:
> 
> Hi All
> I have been playing with the idea of building a hexapod or 
> Stuart platform mill with linuxcnc for the control system.
> What I need help with at this stage is the design of the joints and 
> length of the struts. I have a few designs in my head and sketched out 
> on paper and am looking to see if any one knows of a program i could use 
> to test various geometries before I started cutting metal and building 
> 100 small test models. This way at least I could get a rough estimate of 
> the expected work envelope and length of various components to do 
> further computer testing and modelling before committing to metal.
> I have played a little in with blender but this is such a big 
> program with a steep learning curve geared more to animation. It has to 
> look right not be true in a mechanical sense. Any hints or suggestions 
> will be greatly appreciated.
> 
> Thanks,
> 
> linden
> 
> 
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Re: [Emc-users] CNC mill + plasma cutter = CNC plasma cutter.

[N. Christopher Perry]

I wouldn't call that shade tree mechanics: I'd call it Yankee ingenuity!

N. Christopher Perry

> On Sep 19, 2015, at 8:35 AM, Gene Heskett <ghesk...@wdtv.com> wrote:
> 
>> On Saturday 19 September 2015 05:15:53 Gregg Eshelman wrote:
>> 
>> Matus1976 is building a motorcycle and needed to do some precision
>> plasma cutting.
>> 
>> Watch the video for his solution.
>> 
>> https://www.youtube.com/watch?v=eJnrjIgVxzU
> Chuckle, handheld because it wobbles.  Shade tree at its best.
> 
> The closest I had come to that is several years ago now, when I had a 
> furniture project going for the next door neighbors, makeing a series of 
> benches to be wrapped around their huge dining room table, so with backs  
> & some without, but all with hinged seats so the box would double as toy 
> storage or whatever.  The mortis and tenon operations I was determined 
> to do on my toy mill.
> 
> So I sawed and milled a 1" thick, by 3" wide, and 16" long alu bar out of 
> that monster block I had bought.  Drilled a square 4 bolt pattern in one  
> end for 5/16" bolts to bolt it to the front face of the head of my toy, 
> which I had to drill & tap.  Then I made a formfitting 2 piece clamp to 
> hold a $30 Chicago die grinder's nose casting after I had filed it 
> fairly smooth.  And did a step and repeat tapped hole pattern in the 
> rest of the bar so I could mount the die grinder such that it hung far 
> enough out over the front of the table with the general idea of letting 
> the end of the stick getting the tenon cut on it, hang down in front of 
> the steel kitchen base cabinet the toy mill sits on.
> 
> Then I made a couple holder jigs out of white ash that mounted to the 
> table, one to carry the horizontally running sticks while the grinder 
> was digging the mortis's, and to hold the vertical stick vertical while 
> the grinder was cutting the tenon on the end of it.  Had to fine tune 
> the gcode a bit to get the right glue fits, but it carved 178 of those 
> joints in the next 2 weeks as I assembled the box carcass's.  I still 
> have the jigs and the grinder, and I could get setup to do it again in a 
> couple hours.
> 
> Similar shade tree engineering... ;-)
> 
> Cheers, Gene Heskett
> -- 
> "There are four boxes to be used in defense of liberty:
> soap, ballot, jury, and ammo. Please use in that order."
> -Ed Howdershelt (Author)
> Genes Web page <http://geneslinuxbox.net:6309/gene>
> 
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Re: [Emc-users] Learning LinuxCNC Youtube Channel

[N. Christopher Perry]

Very impressive!

N. Christopher Perry

> On Sep 18, 2015, at 12:32 PM, Jon Elson <el...@pico-systems.com> wrote:
> 
>> On 09/18/2015 08:26 AM, andy pugh wrote:
>> On 18 September 2015 at 14:23, Erik Christiansen
>> <dva...@internode.on.net> wrote:
>> 
>>> Looking forward to the one on using the probe with LinuxCNC.
>> Have you seen the probe tab that "verser" created?
>> http://www.linuxcnc.org/media/kunena/attachments/20614/ProbeIssue.png
>> 
>> 
> Wow, looks very nice!!  I might have to get a probe!
> 
> Jon
> 
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Re: [Emc-users] LinuxCNC controlling inudction heater

[N. Christopher Perry]

That is a thing of beauty.

N. Christopher Perry

 On Aug 26, 2015, at 12:17 AM, Leonardo Marsaglia 
 leonardomarsagli...@gmail.com wrote:
 
 Hello to all!
 
 I don't recall showing to the list how the machine works with an actual
 part on it so here it is: A short video showing how it heats, quenches and
 then goes to the next position.
 
 https://youtu.be/xyWUCGUbUaY
 
 As always thanks for your support!
 
 
 -- 
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Re: [Emc-users] Resetting a tilt-able head to plumb?

[N. Christopher Perry]

What are you going to use to run the indicator up and down the rod?  If it is a 
reasonably well made height gage you should be fine.

N. Christopher Perry

 On Aug 18, 2015, at 8:32 AM, Gene Heskett ghesk...@wdtv.com wrote:
 
 Greetings all;
 
 I am getting an artifact in my carving such that when the mating pieces 
 are turned around and the joints meshed, indicates the head may be 
 tilted a fraction of a degree.  The indicator pointers location prevents 
 it from being viewed headon because you can't see thru the quill, so 
 some parallax error is possible.  It is also possible the tool is 
 flexing as its currently moving at 50 IPM cutting about .225 deep per 
 pass, so the chips from an all climb cut are decent sized.  And its a 
 used mill, having cut some alu in its history.  It was a handy bit in 
 reach at the time. 
 
 I do not have a dial holder that would hold a .0001 dial indicator in 
 the spindle for a rotational check to see if its dead perpendicular to 
 the table AND the table currently has the work holding jig/pallet 
 mounted and in the way of accessing the tabletop.  Its just clamped, but 
 I think I'd glue a T-groove fitting stick to each end of it so it 
 becomes keyed to the table before I'd remove it.
 
 As a method to show grosser errors, I am thinking of chucking up an 8 
 section of A2 rod, verifying any runout, and dialing the side of that as 
 I run it up  down the post.
 
 Would this be a suitable method of checking the alignment (tramming) 
 between the post and the axis of a mounted tool?
 
 Thanks all.
 
 Cheers, Gene Heskett
 -- 
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 soap, ballot, jury, and ammo. Please use in that order.
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Re: [Emc-users] Inverted Tooth Chain Drives

[N. Christopher Perry]

Belts have come a long way in the last 20 years.  The Gates polychain GT types, 
like you see on all modern Harleys, are functionally as stiff as chain and are, 
in the case of Harleys, rated for the life of the bike.

The GT2 profile on these belts are involute, so they are much quieter than the 
HTD profiles.

The benefits of chain are diminishing with time, and at this point cost is the 
only advantage to people like us doing one offs.

N. Christopher Perry

 On Aug 10, 2015, at 9:46 AM, Peter Blodow p.blo...@dreki.de wrote:
 
 Ma first car, built in 1956, was a Fiat NSU 600, 600 cm³, 19 HP. It had 
 a 4 cyl. motor with a chain drive for the camshaft. I would never let me 
 down. Only thing was: to eliminate play, there were little weights 
 attached to every 4th chain link, forced outward by centrifugal force 
 and thus shortening the chain by excentric chain bolts. Once they were 
 pretty far out, they ground a channel into the alu casing and there went 
 my oil... took me too long to notice...
 
 Peter
 
 Am 10.08.2015 14:34, schrieb andy pugh:
 I recently replaced the cam-chain on my motorcycle.
 
 I am not sure I needed to, the new one I bought wasn't very much
 shorter than the old one.
 Examining the drive, it appears to be zero-backlash and to work with
 normal involute-toothed gears.
 In fact, it seems like an ideal drive for a CNC axis. It should be
 stiffer than a toothed belt, much stronger and (according to
 http://www.promsnab.info/catalogues/bosch/tooth%20chains/inverted%20tooth%20chains.pdf
 quieter too). They are also known as silent chains so there might be
 some truth in this.
 
 The requirements of a camtrain drive are very similar to those of a
 CNC axis, and it is interesting to note that the other main-player in
 camtrain drives is the toothed belt.
 
 An inverted tooth chain can run in oil. There are belt-in-oil camtrain
 drives on some engines, but I think that they are specially
 formulated.
 
 The cam-chain I removed had done 100,000 miles, most of it at 5000 rpm
 or more. (and up to 14,000 rpm)
 
 
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Re: [Emc-users] Inverted Tooth Chain Drives

[N. Christopher Perry]

The fiberglass cords in the rubber belts has a sizing agent that assists in 
bonding the fibers to the rubber during the molding/vulcanizing process.  Water 
breaks down that sizing agent resulting in fretting of the glass cords that 
precipitate belt failure.  Saw this first hand in a wheelchair application.

The Polychain shouldn't have this problem, as the manufacturing process is 
completely different.  The cords are completely embedded within the 
polyurethane body of the belt and the sizing agents are supposedly not as 
sensitive to moisture.

N. Christopher Perry

 On Aug 10, 2015, at 2:12 PM, andy pugh bodge...@gmail.com wrote:
 
 On 10 August 2015 at 18:46, Dave Cole linuxcncro...@gmail.com wrote:
 However he said the same belt
 would have no issues running in oil which really surprised me!   He said
 they were designed to run in oily, greasy environments and as such
 running in oil would not likely be a problem.
 
 I think that they might have some problems with hot oil, as found in an 
 engine.
 I wasn't part of the development of the belt-in-oil engine that my
 employer makes, but I caught the odd snippet about it.
 
 -- 
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Re: [Emc-users] Inverted Tooth Chain Drives

[N. Christopher Perry]

I don't know of any off hand, but they are used in a lot of dirty greasy 
environments.

N. Christopher Perry

 On Aug 10, 2015, at 3:23 PM, Dave Cole linuxcncro...@gmail.com wrote:
 
 On 8/10/2015 2:12 PM, andy pugh wrote:
 On 10 August 2015 at 18:46, Dave Cole linuxcncro...@gmail.com wrote:
 However he said the same belt
 would have no issues running in oil which really surprised me!   He said
 they were designed to run in oily, greasy environments and as such
 running in oil would not likely be a problem.
 I think that they might have some problems with hot oil, as found in an 
 engine.
 I wasn't part of the development of the belt-in-oil engine that my
 employer makes, but I caught the odd snippet about it.
 
 Perhaps so.
 These guys run their chain to belt conversion kits dry.
 http://www.jegs.com/i/Jesel/549/KBD-31000/10002/-1
 
 Which engine has a belt running in oil ??
 
 Dave
 
 
 
 
 
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Re: [Emc-users] Have major problem. ball screws out of nut for starters.

[N. Christopher Perry]

Got a collet block?  Clamping the screw with a collet, and maybe a piece of 800 
grit emory paper, is the first thing that comes to mind.

N. Christopher Perry

 On Jun 26, 2015, at 5:39 PM, Gene Heskett ghesk...@wdtv.com wrote:
 
 Greetings all;
 
 I've had a heck of a time putting the Z screw, some of which may be my 
 own fault, and some David Clement's, who sold me the screws on ebay and 
 vanished.  Sorta.  I found a message where there were instructions to dl 
 the instructions, but they are behind a login that he didn't supply a 
 username or passwd for, and his phone number is suddenly out of 
 service.
 
 Then 1-411 can't find a David Clements at 6330 N 15th St, Phoenix, AZ 
 85014.  From the USPS Postage Paid label I saved.
 
 Short of snail mail, I am locked out of a way to contact him.
 
 Any way, the nut is big enough that it cannot be inserted into the post 
 and then turned to face the correct direction to connect it with the Z 
 slider.  So I used the same plastic sleeve to hold the balls that one 
 must use when installing the Y screw.  But while that works for 
 horizontal positioning, it is NOT large enough to keep the balls within 
 the normal trackage in the nut, allowing then to run down and against 
 the teflon seal, so when I screwed the bolt back in, those caught below 
 the recycle guides, those little red plugs, went on down and forced the 
 teflon seal about half out of the recess, and wound up dropping about a 
 dozen balls into the post.  Those I have corraled with a retriever 
 magnet, all of which went on thru a 2 square hole in the bottom of the 
 post, some on the chip tray, but more scattered about on the floor under 
 and behind the stand.  So now I have 2 problems, one being a pile of 
 magnetised balls, which will NOT do, and the nut is one way, can only be 
 turned to climb up the screw toward the top cover and thrust bearing.
 
 So, next is to back off  remove the adjuster nut at the top of the 
 bearing so that the screw can be partially unscrewed, thread end below 
 the top recycle guide, so that the balls can be re-introduced to the nut 
 below the recycle guide. At least I think thats how it should work.
 
 I think now the loose bolts holding the nut to the nut carrier may have 
 been a clue, because there is room, even with the grease zerk on the 
 rear of the nut installed, to slip the nut bracket into position and 
 fasten it to the slider, then bring it to the top of its travel  lock 
 it down, then insert the nut AND screw, assembled from the top, and 
 using long allen wrenches, put the bolts back in.  A right Pain in the 
 Ass but doable.  If I restart 2 opposing bolts with one of those spring 
 clip retriever thingies, then the bolts to the slider can be removed, 
 and it all pulled back to the top of the slot where wrench access to the 
 bolts from the top would be considerably less of a problem.
 
 Unforch, I now have the far end of the screw in a 5 vice, with about 
 5/16 of hard white maple as jaw pads, and the vice snugged up enough 
 to crush the maple to the bottom of the ball grooves.  And I still 
 cannot move that locking nut.  Its turning in the maple in the vice.
 
 So I assume it has some sort of thread-locker juice in it, but the color 
 doesn't ident it to me.  Faint, very faint, line of blue, maybe.
 
 So now I'll have to figure out a way to heat it hot enough to release 
 that.  I can find about 750F with my hot air rework station but with the 
 mass of that screw, being in good contact with the thrust bearings, and 
 them with several ounces of 1/2 alu, it will take quite a while, and 
 maybe even a box to contain the heat well enough.
 
 Anybody got a better idea how to grab the screw, without damaging it, 
 than what I've just described?  Because of the steam in a propane flame, 
 I'd druther use the rework wands dry heat.
 
 Or maybe a line of superglue at the maple/steel junction?  But that stuff 
 is hell to completely remove once set.
 
 Cheers, Gene Heskett
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Re: [Emc-users] minimum spindle speed

[N. Christopher Perry]

Look to see if the VFD has a minimum speed command setting.

N. Christopher Perry

 On Jun 22, 2015, at 1:48 PM, Tom Easterday tom-...@bgp.nu wrote:
 
 I am controlling a spindle motor with a VFD commanded by modbus.  My current 
 speed range is 0-3500 rpm.  If I run the spindle below 275 rpm the current 
 spikes and triggers the VFD’s protection shutoff.  How do I set the minimum 
 spindle speed so that the user can’t command a speed below 275rpm?
 -Tom
 
 
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Re: [Emc-users] Powerhawk VTC-150 Mill Conversion Nearing Completion

[N. Christopher Perry]

Nice job!  

N. Christopher Perry

 On Jun 15, 2015, at 9:45 AM, Chris Kelley tensait...@gmail.com wrote:
 
 Well, we had to make a little circuit board to convert the Fanuc spindle
 analog pulse generator signals to digital quadrature pulses and I mounted
 an optical sensor to read a flag on the spindle to make an index pulse.
 
 Anyway, the machine now rigid taps.
 
 Very first chips made since the conversion began were testing rigid tapping
 in 1/4 polycarbonate with a 1/4-20 tap:
 https://youtu.be/dvdWepZ5o8Q
 
 
 
 On Fri, Jun 5, 2015 at 2:23 PM, Gene Heskett ghesk...@wdtv.com wrote:
 
 On Friday 05 June 2015 12:59:56 Rick Lair wrote:
 I do build from source,
 
 So should I have the VMC folder be in my
 home/testpc/linuxcnc-dev/configs directory,
 
 Then from the command line be in the
 testpc@testpc:~/linuxcnc-dev/configs$ directory,
 
 Then do  sudo halcompile --install --install-doc carousel.comp
 
 Does that sound right?
 
 You may have to edit your .bashrc's PATH to include /usr/bin
 
 or, since you'll be using root $PATH, do
 
 sudo /usr/bin/halcompile --install -- install-doc carousel.comp
 
 On 6/5/2015 12:41 PM, Sebastian Kuzminsky wrote:
 On 6/5/15 10:38 AM, andy pugh wrote:
 On 5 June 2015 at 17:34, Rick Lair r...@superiorroll.com wrote:
 Now I get sudo: halcompile: command not found,
 
 Wierd.
 sudo apt-get install linuxcnc-dev
 Might help, but I didn't think that was necessary, and I would
 imagine you already have it.
 
 Yes, halcompile is part of the linuxcnc-dev package (or in your
 run-in-place path, if you build from source).
 
 Cheers, Gene Heskett
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Re: [Emc-users] micro-v belts, smaller

[N. Christopher Perry]

Ouch!  They've been reasonable for the stuff I've been looking for recently, so 
I thought they might be worth a look.  That quote would have given me sticker 
shock too.

N. Christopher Perry

 On Apr 30, 2015, at 8:13 PM, Gene Heskett ghesk...@wdtv.com wrote:
 
 On Thursday 30 April 2015 18:19:57 N. Christopher Perry wrote:
 Have you tried SDP?:  SDP-SI.com
 
 N. Christopher Perry
 
 Thanks Christopher.  I got an estimate for a belt  2 timing pulleys from 
 them about a year ago, but they wanted well over $300.  I was tempted to 
 ask if the pulley's were made out of gold, but restrained myself.  Even 
 at that price it wasn't quite what I asked for...
 
 After that, my thoughts are that they would be about the last line on the 
 list.
 
 On Apr 30, 2015, at 2:16 PM, Gene Heskett ghesk...@wdtv.com wrote:
 
 Greetings all;
 
 I have been snooping around with my google-fu, and coming up a bit
 long.
 
 Long as in the smallest of tese belts with a kevlar backing, is a
 3/8 wide 3 ribber, 21 long.  That is too long for what I am trying
 to do.
 
 What I have, under design but not carved just yet, would be a set of
 pulley's to be used on my toy mill when I remove the whole gearbox
 on the spindle and replace it with something resembling the LMS is
 selling for the mini-mill.  But the motor will be the 400 watter I
 took off the lathe when I pout the 1 horse on it, so the motors
 pulley will need an 8mm hub, probably another shop made taperlock,
 while the spindle pulley will need a 30mm hub, possibly taperlock if
 I can find room for it.  The two pulleys will be otherwise alike,
 with a 2/1 ratio when the belt is in the reduction grooves, and a
 1/2 when its in the higher speed grooves, gfiving a variable speed
 range of up to 2500 in low range, and up to 10k in high range from a
 5k motor.  That ought to speed up making pcb's a bit.
 
 Unforch, on the gates site, no real data unless I kill a tree with
 their pdf catalog.  Other sites, which obviously stock only the
 popular sizes for automotive useage, do not show anything in the 3
 rib 3/8 width, shorter that 21.  That would put the motor a couple
 inches farther off to the side than I'd like.
 
 Has anyone else found such smallish beasts and can give me a URL?
 
 
 Cheers, Gene Heskett
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Re: [Emc-users] micro-v belts, smaller

[N. Christopher Perry]

Have you tried SDP?:  SDP-SI.com

N. Christopher Perry

 On Apr 30, 2015, at 2:16 PM, Gene Heskett ghesk...@wdtv.com wrote:
 
 Greetings all;
 
 I have been snooping around with my google-fu, and coming up a bit long.
 
 Long as in the smallest of tese belts with a kevlar backing, is a 3/8 
 wide 3 ribber, 21 long.  That is too long for what I am trying to do.
 
 What I have, under design but not carved just yet, would be a set of 
 pulley's to be used on my toy mill when I remove the whole gearbox on 
 the spindle and replace it with something resembling the LMS is selling 
 for the mini-mill.  But the motor will be the 400 watter I took off the 
 lathe when I pout the 1 horse on it, so the motors pulley will need an 
 8mm hub, probably another shop made taperlock, while the spindle pulley 
 will need a 30mm hub, possibly taperlock if I can find room for it.  The 
 two pulleys will be otherwise alike, with a 2/1 ratio when the belt is 
 in the reduction grooves, and a 1/2 when its in the higher speed 
 grooves, gfiving a variable speed range of up to 2500 in low range, and 
 up to 10k in high range from a 5k motor.  That ought to speed up making 
 pcb's a bit.
 
 Unforch, on the gates site, no real data unless I kill a tree with their 
 pdf catalog.  Other sites, which obviously stock only the popular sizes 
 for automotive useage, do not show anything in the 3 rib 3/8 width, 
 shorter that 21.  That would put the motor a couple inches farther off 
 to the side than I'd like.
 
 Has anyone else found such smallish beasts and can give me a URL?
 
 
 Cheers, Gene Heskett
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 soap, ballot, jury, and ammo. Please use in that order.
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Re: [Emc-users] Mesa cards visual documentation

[N. Christopher Perry]

Along the same lines, does anyone have any thoughts on what a style guide would 
include for HAL files?

N. Christopher Perry

 On Apr 20, 2015, at 4:49 PM, Karlsson  Wang 
 nicklas.karls...@karlssonwang.se wrote:
 
 rockhopper geda eagle may be incomplete from some view but the idea is not!
 
 I think the netlist approach is the correct path since it is well proven and 
 used by I think almost all schematic capture applications. There are however 
 a lot of different format 
 http://manpages.ubuntu.com/manpages/karmic/man1/gnetlist.1.html so the 
 starting point is hard to decide, add a *.hal format?
 
 I have not seen the Geda effort but I guess Linuxcnc had to have a symbol 
 library?
 
 Then there is a symbol library for the linuxcnc parts and a suitable netlist 
 format and the editor is not good or need to be integrated this is the second 
 step.
 
 
 Nicklas Karlsson
 
 
 
 On Sun, 19 Apr 2015 20:58:45 -0500
 TJoseph Powderly tjt...@gmail.com wrote:
 
 On 04/19/2015 01:40 PM, andy pugh wrote:
 On 19 April 2015 at 18:31, Karlsson  Wang
 nicklas.karls...@karlssonwang.se wrote:
 I guess it would be possible to modify or make Linuxcnc accept a netlist 
 as a hal file and in such case for example Geda could be used for 
 configuration. What do you think?
 
 It has been tried:
 http://wiki.linuxcnc.org/cgi-bin/wiki.pl?HalSchematicsUsingGschem
 http://wiki.linuxcnc.org/cgi-bin/wiki.pl?Eagle2HAL
 
 But that does rather the same thing that Rockhopper does, but not as 
 prettily.
 i think rockhopper does not output hal from a drawing.
 i think it 'just' displays a visualization of a hal file.
 it's not a design tool, its a proofing tool.
 
 I think the Geda and Eagle attempts were the other direction,
 they attempted to visually create netlists using a gui pallete of comps.
 
 ( iirc i tried to read _and_ write hal files )
 
 any 'pretty' in Geda/Eagle is up to the designer
 (s)he can drag and drop
 or rearrange as (s)he likes
 
 no modifications allowed in the rockhopper output
 you cant re-arrange the svg to make sense of one knot.
 
 your back to   edit compile debug (repeat)
 
 rockhopper geda eagle are all incomplete from some view
 
 tomp tjtr33
 ( i wrote the miserable Geda effort :(
 
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Re: [Emc-users] Missing/incorrect steps

[N. Christopher Perry]

You might want to twist those pairs a little tighter.  I try to have at least 4 
turns per inch.

N. Christopher Perry

 On Mar 8, 2015, at 6:45 PM, Neil emc_d...@narwani.org wrote:
 
 This is how it's wired...
 http://orlandorobotbuilders.com/rw/2015-03-08-Elec-01-Wiring.jpg
 
 The white/green wire pairs are the step/direction pairs for each axis.  
 From the right to left, it's Z,Y,X, and then A in the upper left.  This 
 is after I removed my optoisolator breakout board.  The IM483's have 
 optoisolators on the inputs, which is why I figured I can remove mine.
 
 Cheers,
 -Neil.
 
 
 On 3/8/2015 4:22 PM, andy pugh wrote:
 How do you have things wired? Do the drives have an opto-isolator on 
 the input? Parports work better if you think of them as current sinks 
 rather than voltage sources. Not knowing what your stepper-drive 
 inputs look like I can't get more specific than that.
 
 
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Re: [Emc-users] VFD causing limits to trip. Huh?

[N. Christopher Perry]

Zuercher,

If Gene is right, then there is a really big loop area.  Ether the leads to the 
motor / drive are taking different paths or the is a big ground loop some place.

You could try moving the leads around to confirm what Gene is suggesting.  If 
this is the case, check for ground loops.  If there aren't any, then you should 
consider rearranging you wiring.

N. Christopher Perry

 On Mar 6, 2015, at 3:14 PM, Charles Steinkuehler char...@steinkuehler.net 
 wrote:
 
 On 3/6/2015 1:43 PM, Todd Zuercher wrote:
 What sort of screen? and where is it in relation to the VFD?  We have
 a router with 2 VFDs mounted on the outside of a wooden cabinet, and
 they wreak havoc on the CRT display inside the cabinet when they
 accelerate/decelerate (about 6 inches away).  It is fine while its
 running, just when stopping and starting.  I was thinking I should
 make some sort of metal shield to mount between them, but its been
 that way for more than 15 years without any thing more than this
 aesthetic problem so it hasn't been real high on my to do list.
 
 I know this one:
 
 You need a Mu-Metal shield.  The VFD is throwing enough current around a
 big enough loop it's generating magnetic fields (*NOT* EMI!) and
 distorting the video display.  It happens on speed changes because
 you're drawing lots of current.  It should also happen if you load the
 motor with a deep cut and push it close to it's rated power level.
 
 Really nice broadcast studio monitors are magnetically shielded to avoid
 this, but just about any other CRT monitor won't be.
 
 http://en.wikipedia.org/wiki/Mu-metal
 
 And yes, a magnetic field _is_ a form of EMI (Electro Magnetic
 Interference), but it's at a _really_ low frequency and thus is
 generally not affected by the typical EMI shielding practices that are
 mostly concerned with very high frequency effects.  You might have good
 luck simply turning the VFD to a different orientation (try rotating it
 on it's side or back and see if the problem gets any better or worse).
 
 -- 
 Charles Steinkuehler
 char...@steinkuehler.net
 
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Re: [Emc-users] VFD causing limits to trip. Huh?

[N. Christopher Perry]

You could also put a reactor between the motor and drive.  Might be a good idea 
to put a line filter on the power leads to the drive too.

I'm not a fan of shielding, but it's certainly an option as well.

N. Christopher Perry

 On Mar 6, 2015, at 7:36 AM, Stephen Dubovsky smdubov...@gmail.com wrote:
 
 EMI.  VFDs generate lots of it. You're likely getting lots of noise coupled 
 into your limit switch cabling.  Shield the vfd wires if possible. Running in 
 a shielded single cable is probably best. Separate the motor and switch 
 cables as much as possible too. 
 
 On March 6, 2015 6:56:08 AM EST, russ...@lls.lls.com wrote:
 
 I've just fitted one of them there 'Chinese' 2.2kW watercooled motors
 with a Huanyang VFD as a second spindle on my mill.
 
 Last night doing some pocketing, when the cutter got into the 'meat' of
 the cut (6mm carbide 2 flute, 3mm DOC), Linuxcnc (v2.6.7) tripped with
 Axis 2 limit switch.
 
 This was unexpected as I was nowhere near the Z-axis limit switches so
 I
 checked the connections and started the job again  and it did
 exactly the same thing again in the same place!
 
 Just for fun, I reduced the DOC, tried again and the same thing
 happened
 in the same place (about 20 seconds into the job).  H
 
 The VFD is 1 foot away from the limit switch wiring, and the connection
 from the VFD to the motor is shielded and grounded at the VFD end.  I'm
 controlling the VFD with hy_vfd over RS485.
 
 The limit switches (normal microswitches bolted to the column) are
 wired
 to a Mesa 7i76 with 12V field power and have not played up before.
 
 I did an 'air-cut' and that ran well past the place it was consistently
 failing.
 
 I commented out:
 
 #net both-home-z =  axis.2.home-sw-in
 #net both-home-z =  axis.2.neg-lim-sw-in
 #net both-home-z =  axis.2.pos-lim-sw-in
 
 in my Mill.hal file and the job ran to the end.  Axis 0 and 1 limits
 were left unchanged.
 
 I ran out of time to experiment much further but I'm struggling to see
 how the VFD could trip a simple limit switch when it's getting a bit
 loaded up (the spindle was only pulling ~1amp according to hy_vfd and
 it's rated for 8).
 
 I don't think it was simple vibration as I'd been fly cutting with my
 normal spindle shortly before and that didn't trip anything.
 
 Any ideas what might cause this?
 
 -- 
 Regards,
   Russell
 
 | Russell Brown  | MAIL: russ...@lls.com PHONE: 01780 471800 |
 | Lady Lodge Systems | WWW Work: http://www.lls.com  |
 | Peterborough, England  | WWW Play: http://www.ruffle.me.uk |
 
 
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Re: [Emc-users] VFD causing limits to trip. Huh?

[N. Christopher Perry]

That's the big brother of the one I picked.

N. Christopher Perry

 On Mar 6, 2015, at 12:34 PM, Dave Cole linuxcncro...@gmail.com wrote:
 
 VFDs and AC servo drives oftentimes create noise on the incoming AC 
 power lines to the drives.That noise can cause interference issues 
 with system electronics.
 
 I recommend you purchase an incoming line filter to keep the noise from 
 backing up into your AC power line.
 
 This is a filter I used on a recent installation.  Put this as close to 
 the drive/s power input connection as practical.
 
 http://www.automationdirect.com/adc/Shopping/Catalog/Drives/AC_Drive_%28VFD%29_Spare_Parts_-a-_Accessories/GS_EMI_-z-_RF_Filters/EMI_-z-_RF_Filters_%28All_GS_Drives%29/20DRT1W3S
 
 There are cheaper filters available but I know that this one works.
 
 Dave
 
 
 On 3/6/2015 6:56 AM, Russell Brown wrote:
 I've just fitted one of them there 'Chinese' 2.2kW watercooled motors
 with a Huanyang VFD as a second spindle on my mill.
 
 Last night doing some pocketing, when the cutter got into the 'meat' of
 the cut (6mm carbide 2 flute, 3mm DOC), Linuxcnc (v2.6.7) tripped with
 Axis 2 limit switch.
 
 This was unexpected as I was nowhere near the Z-axis limit switches so I
 checked the connections and started the job again  and it did
 exactly the same thing again in the same place!
 
 Just for fun, I reduced the DOC, tried again and the same thing happened
 in the same place (about 20 seconds into the job).  H
 
 The VFD is 1 foot away from the limit switch wiring, and the connection
 from the VFD to the motor is shielded and grounded at the VFD end.  I'm
 controlling the VFD with hy_vfd over RS485.
 
 The limit switches (normal microswitches bolted to the column) are wired
 to a Mesa 7i76 with 12V field power and have not played up before.
 
 I did an 'air-cut' and that ran well past the place it was consistently
 failing.
 
 I commented out:
 
 #net both-home-z =  axis.2.home-sw-in
 #net both-home-z =  axis.2.neg-lim-sw-in
 #net both-home-z =  axis.2.pos-lim-sw-in
 
 in my Mill.hal file and the job ran to the end.  Axis 0 and 1 limits
 were left unchanged.
 
 I ran out of time to experiment much further but I'm struggling to see
 how the VFD could trip a simple limit switch when it's getting a bit
 loaded up (the spindle was only pulling ~1amp according to hy_vfd and
 it's rated for 8).
 
 I don't think it was simple vibration as I'd been fly cutting with my
 normal spindle shortly before and that didn't trip anything.
 
 Any ideas what might cause this?
 
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Re: [Emc-users] BBB variable voltage output for spindle speed

[N. Christopher Perry]

I've developed a circuit just for this application:
https://dl.dropboxusercontent.com/u/34705319/Spindle Drive Interface 
Schematic.pdf

It does a fairly decent job.  It gets within ~0.5% of full scale on both ends 
and has a linearity error of ~0.5%.  In addition it has a couple of opto 
isolated control/feedback signals for spindle enable and a 'at speed' 
indication.

Here are the Eagle files for it if you'd like to crib them:  
https://www.dropbox.com/sh/solnou6bjixmmp7/3b3ChzN0Wk

I've even got a few bare PCBs and a couple of populated ones if you'd like to 
buy one.

N. Christopher Perry


On 2014-Feb-16, at 00:07, Jared Turner wrote:

 I'm still working with trying to get programatic speed control from my BBB. 
 My driver requires a 0-10v signal or a 10k pot to control speed. Had to take 
 a break from this - schoolwork is kinda inconvenient at times - found out my 
 digital pot can't work for 10v signals... so I'm thinking about implementing 
 an op-amp and ramping up the output of the BBB to 0-10v. My other option is 
 to connect a servo/stepper motor to a pot which seems a little silly. I'm 
 just wondering which is easier...
 
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Re: [Emc-users] polyurethane resin casting

[N. Christopher Perry]

N. Christopher

On Sep 27, 2013, at 11:27, Erik Friesen e...@aercon.net wrote:

 Has anyone here done much polyurethane resin pouring?  I have been trying
 to fine tune the process.  Current process uses silicon moulds.
 
 #1.  Does it work to use aluminum moulds?
It does.

 #2.  Could it work to use high vacuum to eliminate air bubbles?  I would
 envision using some type of fill funnel and a pulling a full vacuum, then
 opening the entrance to the funnel with some type of rod/oring seal.
Some of these resins will out gas when you pull a vacuum on them, so you should 
check them outside the mold first.  It is generally recommended that you you 
use a mixing method that minimizing entrained air and apply pressure to 
minimize bubble size.

 The current material I am using sets in about 10 minutes, the gel time is
 around 50 seconds, so its all static mixed.
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Re: [Emc-users] Displaying a variable in the Axis Custom Panel

[N. Christopher Perry]

Try using 'DEBUG'.  I have the same problem with 'PRINT'.

N. Christopher Perry

On Sep 13, 2013, at 0:18, Cecil Thomas wctho...@chartertn.net wrote:

 I have completed the CNC conversion of my Monarch 10EE except for the 
 spindle speed control.  For now I must set the spindle speed manually 
 with the speed knob.
  Until I have figured out how to control the 10EE speed  from 
 LinuxCNC I would like to have a message or notice to show up in my 
 Axis  custompanel where I have the  spindle speed readout and 
 the  Spindle at speed Led.
  I would like for it to say:
  set spindle speed to #71  RPM .
   But of course #71 is a variable and it is calculated in my 
 threading program based on the maximum Z axix velocity I want to 
 thread at and the pitch of the thread I am cutting.  So it would 
 really say something like:
 Set Spindle Speed to 325 RPM   where 325 is the value of the 
 calculated variable.
   I can't put it in a MSG because MSG won't accept variables.  I 
 could put it in a PRINT statement but it would only show up in a 
 terminal window if I started LCNC from a terminal.  Which will work 
 but is not very cool presentation-wise.
 Is there a reasonably simple way to get a variable to display on the 
 Custompanel ??
 Thanks,
 Cecil
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Re: [Emc-users] 3D Models from photos

[N. Christopher Perry]

On Sep 12, 2013, at 10:37, Kirk Wallace kwall...@wallacecompany.com wrote:

 On 09/12/2013 06:49 AM, Viesturs Lācis wrote:
 2013/9/12 Kirk Wallace kwall...@wallacecompany.com
 
 On 09/12/2013 06:25 AM, andy pugh wrote:
 http://youtu.be/sGNesS8vo4M
 
 I am pretty impressed
 
 This will give the GGG machines something more than Yoda to print.:)
 
 What is GGG and Yoda?
 
 GGG = Glorified Glue Gun or 3D printer
 
 Yoda = http://www.thingiverse.com/thing:14104
 http://en.wikipedia.org/wiki/Yoda
 
 I'm not really trying to make fun of 3D printers. I think they are at an 
 awkward place in development.

Perhaps, but they do have uses.  Besides, even the professional level systems 
have some frustrating limits:  None of these technologies provide machined part 
quality surface finishes or dimensional tolerances.

I happily use both professional systems and a Solidoodle for a variety of 
parts.  They are invaluable when used appropriately and, with a modest amount 
of post machining, the parts they produce are extremely functional.

 -- 
 Kirk Wallace
 http://www.wallacecompany.com/machine_shop/
 http://www.wallacecompany.com/E45/

N. Christopher
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Re: [Emc-users] hm2 - pwmgen vs 3pwmgen for BLDCs

[N. Christopher Perry]

N. Christopher Perry

On Jul 15, 2013, at 14:13, propcoder marius.alks...@gmail.com wrote:

 I am thinking of my misfortune with IRAM IGBT module and BLDC motors. As 
 I wrote earlier  - the motion and torque was not smooth.

Do you really need IGBTs?  Are your voltages/currents high enough to require 
them. FETs are much easier to work with.

 
 Is there sense to try to commutate lower transistors just on-off and 
 higher ones with sine PWM? If so - can simple hm2 firmware with pwmgens 
 be used for that (instead of 3pwmgens, which do have A-value, B-value 
 and C-value input pins only)?
 
 Marius
 
You should be able to do that.  It does make shot-through a little easier to 
manage.  Also, there are 3-phase gate drive controllers that will manage the 
gate timing for you. Do a google search for them.  Fairchild and IRF have a 
range of them.


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Re: [Emc-users] hm2 - pwmgen vs 3pwmgen for BLDCs

[N. Christopher Perry]

N. Christopher Perry

On Jul 15, 2013, at 15:06, propcoder marius.alks...@gmail.com wrote:

 
 2013.07.15 21:56, N. Christopher Perry rašė:
 You should be able to do that.  It does make shot-through a little easier to 
 manage.  Also, there are 3-phase gate drive controllers that will manage the 
 gate timing for you. Do a google search for them.  Fairchild and IRF have a 
 range of them.
 What do you mean by gate timing? I use IRAM module from IRF. It has 
 internal protection from shoot-through, it adds dead times by itself.
 

Ahh...  That makes some things easier.  Another benefit is that some of these 
gate drive modules also manage highside/lowside switching so that all you need 
is to provide a pwm command for each phase and it takes care of all of the 
switching logic.

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Re: [Emc-users] 5V PWM to +-10V analog converter circuit

[N. Christopher Perry]

I created a similar circuit a while to control my spindle, but it should work 
fine for your application.  I went a little farther and added an op-amp 
configured as a comparator, to get the opto-isopated PWM signal to be closer to 
rail-to-rail and symetrical, and an op-amp configured as a voltage follower to 
minimize the effect of output loading.



PWM-to-Analog Interface.pdf
Description: Adobe PDF document


I have some spare PCBs if you'd like to try this circuit out.

N.C.

On 2013-Jul-12, at 12:54, andy pugh wrote:

 On 12 July 2013 17:41, propcoder marius.alks...@gmail.com wrote:
 Maybe someone knows where to find tested and working schematics?
 
 http://tom-itx.dyndns.org:81/~webpage/cnc/ACPL-P480_opto_sch.png
 
 (It needs to be a totem-pole or push/pull opto, or it can charge the
 cap, but not discharge it, and the result is non-linear).
 The clue to the component is in the title, but not mentioned on the
 diagram. It's an ACPL P480
 http://www.farnell.com/datasheets/611920.pdf
 
 I found schematics of PWM to analog converter which uses two digital
 optocouplers.
 
 That was mine too. The one above is simpler and almost certainly better.
 
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Re: [Emc-users] Cutting involute spur gears with 4 axis?

[N. Christopher Perry]

There is also this application that will generate gcode for synchronous belt 
sprockets too:  gearotic.com

N. Christopher Perry

On Jul 5, 2013, at 10:24, Chris Kelley tensait...@gmail.com wrote:

 Gregg,
 
 I've been playing with doing almost exactly what you are talking about.
 I've even cut some proof-of-concept involute gears using only a gcode
 program that generates the gear.
 
 Here's some images of the test part (aluminum):
 
 http://i.imgur.com/0AYZbpi.jpg
 
 and
 
 http://i.imgur.com/LeW10nX.jpg
 
 Here's the finished part:
 http://i.imgur.com/tCYRMjJ.jpg
 
 The gear closest to the end is 18 teeth and the one farthest from the end
 is 17 teeth. The cutter was just a 1/8 diameter end mill. The aluminum is
 ~2 round stock that I cast from dirty scrap aluminum so there is some
 obvious porosity.
 
 The gcode program is attached to this message. I'm kind of hesitant to post
 my code because it's likely difficult to follow (even I have a hell of a
 time debugging it, and I wrote it.
 
 Unlike using a form cutter to generate both sides of a tooth space at the
 same time, my program uses a straight sided end mill and forms one side of
 the tooth space at a time. With a form cutter you move the cutter only in a
 horizontal plane (or vertical in the case of a fly cutter) while rotating
 the gear under it. My program moves the cutter at an angle from the
 horizontal that is equivalent to the pressure angle.
 
 While my program generates involute gears, they are not even close to
 standard DP of modules, but gears made with the same parameters but with
 different number of teeth will mesh correctly. With my code you specify
 what I call the root width (the width of the flat on top of the equivalent
 rack teeth, which is also assumed to be the diameter of the cutter), the
 tooth height (the height of the gear rack teeth), the pressure angle
 (anything positive and non-zero should work), number of teeth, and the
 quality (number of passes for each side of the tooth, bigger numbers take
 longer, but make more accurate forms, especially on forms with undercut).
 
 Things I would like do add (once I get one of those elusive round tuits)
 are the ability to make actual standard DP and Module sizes, as well
 helical and knuckle gears.
 
 -Chris
 
 P.S. My 4th axis may or may not rotate the right (standard) direction, so
 you may have to change a few signs to make the gcode work.
 
 
 
 On Thu, Jul 4, 2013 at 8:12 AM, Matthew Herd herd.m...@gmail.com wrote:
 
 To Andy's point, it will work, it's just a matter of lots and lots of
 passes.  For instance, see
 http://neme-s.org/Shaper%20Books/Michael_Moore/shaper%20gear%20cut.pdffor 
 how it can be done on a metal shaper with a rack form tool.  There is
 no need for an undercut.  The same basic method could be used for a
 ball-nose endmill but you'd need to make even more passes because you
 wouldn't have the correct taper to the sides of the tool or the correct
 nose radius.  There's really no need to reverse if you just complete a full
 rotation to bring you to wherever you need to start for the next tooth, so
 that eliminates the backlash problem in your 4th axis.  However, I suspect
 you'd also have a problem with wear on the endmill because of the
 relatively high RPM and numerous tiny (and slow) passes at a low chip-load
 required to generate acceptable surface finish.  You should be able to do
 helixes without a problem by adding in the spiral motion, but this would
 take some thinking.
 
 You could also use a form ground grinding wheel as a slitting saw, as in
 Dave's method, to finish the gear.  It's essentially a single tooth hob
 with an infinite number of teeth.  You could do this post-heat treat if you
 wanted automotive quality gearing.  One form wheel could handle any gear
 tooth count in the same module/pitch diameter and you can do helixes if you
 can set your head over at an angle.  You can even dress the gear with the
 CNC machine to ensure that it is of known diameter and accurate form.
 Obviously I've given this a great deal of thought ... maybe a project I'll
 attempt someday.
 
 Matt
 
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Re: [Emc-users] USB Pendant (XHC HB04)

[N. Christopher Perry]

 That unit does look nice.  But the wireless thing scares me a bit.   
 Someone test one of those out on a small machine.   :-)
 
 I did get a Pendant from this chinese supplier:
 http://www.ebay.com/itm/Universal-CNC-4-Axis-Pendant-MPG-Handwheel-Emergency-stop-Switch-controller-/281117912050?
 
I have a similar one I picked up from a Chinese supplier and am very happy with 
it.

 The total bill was $92 including shipping from Hong Kong and I got it in 
 less than 2 weeks.
 
 The unit looks to be of decent quality.   The MPG has a good feel and it 
 does not feel cheap.   The coil cord is like a small rubber SO cord with 
 flying leads and
 of decent quality.   Time will tell how it holds up.For $92 I would 
 say it is a very good deal.   I would not hesitate to buy another unit 
 from this seller.
 
 Dave Cole
 
 
 
 On 6/23/2013 9:19 AM, Pete Matos wrote:
 Wow that looks like a really nice unit man I have been wanting
 something like That for my VMC here.  My only concern is the wireless
 nature and if it will cause problems.  It certainly looks like it has tons
 of features. Peace
 
 Pete
 
 
 
 On Sunday, June 23, 2013, Frederic RIBLEfri...@teaser.fr  wrote:
 
 Le 2013-06-23 07:10, andy pugh a écrit :
 
 On 22 June 2013 02:36, f1oatfri...@teaser.fr  wrote:
 
 
 I have developed a HAL module for this kind of MPG pendant.
 Look at
 http://www.linuxcnc.org/index.php/english/forum/24-hal-components/26679-xhc-hb04-wireless-mpg-pendant-hal-module
 
 Would you be interested in adding this to the LinuxCNC distribution? I
 think that this model of pendant is likely to become quite common, and
 that LinuxCNC ought to support it.
 Yes, I will be very happy to see this module in the official distribution.
 I know it will need some additional work to support the different
 keyboard layouts we can find on the market.
 For that, I am waiting for usage reports from other users.
 

N. Christopher Perry
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Re: [Emc-users] What is the Wichita meeting?

[N. Christopher Perry]

Very cool!

N. Christopher Perry

On Jun 12, 2013, at 17:50, Sven Wesley svenne.d...@gmail.com wrote:

 2013/6/12 Matt Shaver m...@mattshaver.com:
 On Wed, 12 Jun 2013 13:17:05 +0200
 Sven Wesley svenne.d...@gmail.com wrote:
 
 ...and why isn't it promoted at http://linuxcnc.org?
 
 Mostly because we're a bunch of knuckleheads. Is this you?
 https://www.facebook.com/sven.wesley I ask because if it is, you
 probably don't live in the US (if you're wondering, it was the
 diacritical marks that gave you away).
 
 Anyway, Wichita, Kansas is where Stuart Stevenson has his airplane
 parts making shop. Every once in a while he (and Roland Friestad
 in Galesburg, Illinois before him) has a get together of the linuxcnc
 developers. It's hard to recommend that someone attend these meetings
 unless they are a hard core linuxcnc enthusiast. If you've never
 been to one, whatever you imagine these meetings to be like is probably
 wrong. Let's just say they are a rather singular experience, kind of
 like Burning Man but a lot smaller and without girls.
 
 Anyway, if I have the right Sven Wesley, you seem to be one of those
 X-Games/Extreme Sports guys so I can't rule out the possibility that
 you might own an airplane. If so, and you decide to show up, call me on
 my cell at (443)789-4628 and I'll get you picked up from the airport
 (ICT). If you come, I'll buy you a steak dinner (apologies if you're
 vegan).
 
 Thanks,
 Matt
 
 
 Yes, that's me. And it's not very difficult to find me, with or
 without diacrit's (NSA; is it good or bad from a terrorist point of
 view to have a 1 in a 9-billion unique name?).
 
 This is more or less the only communication channel I'm using for
 LinuxCNC. As I see it it's kinda sad that here is a large open
 community but the core(?) developers get together without anyone
 outside the developer's list knowing about it. I would say I'm very
 pro LinuxCNC and even though I don't have time to code anything right
 now because of other software projects it might be possible that I
 chime in somewhere in the future. And with that said, I think more
 people like me would involve themselves in the project if we could at
 least get a glance what's happening. Don't get me wrong here, you all
 do a terrific job, my machines runs daily thanks to your work and of
 course you should meat up and have a bear or two. Carrots aren't for
 pilots.
 
 On the other hand (I have expressed the same opinion before) I think
 there are too many communication channels for this project. Several
 mailing list, IRC, forum here forum there, wiki documents everywhere.
 I could have missed it, there probably was a note somewhere (several
 people do know about it for sure) but I couldn't find a reference what
 it is all about.
 
 Where I live, companies can clear out VAT against investments. I have
 too much VAT generated by sales right now and a business trip to the
 states could easily been covered by the firm. You never now, next time
 I might show up. If I know about it.
 
 BTW, I do have a license. But I prefer it engineless. ;)
 http://www.youtube.com/watch?feature=player_detailpagev=J3NyptGJzLo#t=159s
 And my carrot soup is kicking.
 
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Re: [Emc-users] Upgrade to ATC

[N. Christopher Perry]

Lovely!  But, alas, out of my non-professional price range.  I built my whole 
machine for what that cost.

N. Christopher Perry

On Jun 12, 2013, at 18:07, Sven Wesley svenne.d...@gmail.com wrote:

 2013/6/12 Sven Wesley svenne.d...@gmail.com:
 
 I saw a really nice ATC as an add-on that fits the common Chinese VFD
 spindles. It was very nice looking but expensive.
 
 /S
 
 Found it!
 http://store.blurrycustoms.com/SearchResults.asp?Cat=46
 
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Re: [Emc-users] OT: USM Motors

[N. Christopher Perry]

Aside from hooking up / rigging up an LCR meter and checking the capacitance of 
the various 'phases', there isn't much you can do.  This measurement might 
indicate a cracked piezo element or broken contact where the circuit looks like 
a OC.

Mechanically, there might be excessive surface wear / contamination on the 
friction surface.

These are the first things I'd investigate.

N. Christopher Perry

On Jun 12, 2013, at 19:58, Kirk Wallace kwall...@wallacecompany.com wrote:

 Has anyone here worked on ultrasonic motors? I need to repair one (Canon 
 lens) and need some insight. Such as, is there something like a 
 continuity check to see what part of the motor might have a fault?
 
 http://en.wikipedia.org/wiki/Ultrasonic_motor
 http://www.noliac.com/Files/Billeder/Pdf/Pdf%20%20external/Piezoelectric_ultrasonic_motors.pdf
 http://photo.net/canon-eos-digital-camera-forum/00QHjI
 --
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 http://www.wallacecompany.com/machine_shop/index.html
 
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Re: [Emc-users] Cam Grinder

[N. Christopher Perry]

That mechanism is interesting, thought non-linear.  You'd need to maximize the 
connecting rod lengths and then probably do some linearization in software to 
get the output to deliver uniform incremental displacement.

N. Christopher Perry

On May 30, 2013, at 3:42, Gregg Eshelman g_ala...@yahoo.com wrote:

 Here's something that looks like the perfect thing for moving the grinder 
 head on a CNC cam grinder.
 
 http://www.youtube.com/watch?v=9WIMscMFLAA
 
 Instead of connecting the two eccentrics to one motor and manually adjusting 
 it, use two servo motors which would be independently controlled to 
 continuously vary the stroke. Looks like the reaction time could be very 
 fast, especially if both differential motor speed and reversing are used.
 
 A plain eccentric timed to the shaft rotation won't do for most camshafts.
 
 Flat tappet cams are usually egg shaped, with a rather pointy small end and a 
 very small side to side taper around the base circle so the tappet and other 
 valvetrain components will rotate. (The Chevy 350 smallblock V8 is a bit 
 notorious for tappets failing to rotate then quickly chewing up themselves 
 and the camshaft.) Roller tappet cams are usually racetrack shaped with a 
 round end, nearly flat sides and no taper.
 
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Re: [Emc-users] variable reluctance motors

[N. Christopher Perry]

As I said, trying to align injected harmonic content to a signal in real-time 
with the required accuracy, while the fundamental frequency is rapidly 
changing, is not algorithmically possible given existing control schemes.  Even 
if you could figure out how to fix that, no one has come up with a way to 
evaluate the frequency content of a plant's response under these conditions, so 
the controller does't have enough information to calculate phase and magnitude 
information for that injected harmonic.  It doesn't matter how close you get 
the controller to the motor.

Mapping schemes aren't terribly effective because torque ripple ends up being 
dependent on more than just rotor position and torque.  Temperature 
dependencies in the permeability of the stator  rotor laminations, localized 
saturation, positionally dependent gap variations all contribute and more.

If you figure out how, you could make a hell of a lot of money 

N. Christopher Perry

On May 3, 2013, at 23:44, Gregg Eshelman g_ala...@yahoo.com wrote:

 --- On Fri, 5/3/13, N. Christopher Perry n_christopher_pe...@me.com wrote:
 clip
 The main scheme for accomplishing ripple reduction is
 harmonic injection, but that requires very accurate phase
 and magnitude targets, both of which can be expected to
 change as a function of speed and torque.  Where speed
 is changing, it's hard to even define phase in a control
 space.
 clip
 
 How about building it into the motor? If it's going to be used as a servo 
 motor, it already has the setup to sense the RPM and velocity changes. Should 
 be possible to measure the torque in realtime too.
 
 Have all that connected into an on-motor power conditioning system that gets 
 instant feedback, modifying as required by external commands for direction 
 and speed changes.
 
 The thing could be programmed to emulate any kind of servo or stepper and 
 with the right sort of additional circuitry could run as an AC or DC servo.
 
 That'd make those the first truly universal motors.
 
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Re: [Emc-users] variable reluctance motors

[N. Christopher Perry]

Turns out that ripple compensation is very doable at steady speeds (which is 
why your new washing machine doesn't immediately shake itself to prices, where 
SR motors are most common these days) but is very hard to do in real-time at 
rapidly changing speeds, such as servoing applications.  

The main scheme for accomplishing ripple reduction is harmonic injection, but 
that requires very accurate phase and magnitude targets, both of which can be 
expected to change as a function of speed and torque.  Where speed is changing, 
it's hard to even define phase in a control space.  

There was a lot of thought put into trying to do ripple compensation at Otis 
Elevator when I was there.  They care a lot about minimizing ripple torque 
given it very directly effects ride quality.  In the end, proper motor 
architecture and design were identified as more effective at reducing torque 
ripple.

I'm sure there is academic work being done to explore other potential control 
schemes, but none I've heard of solves these problems yet.

N. Christopher Perry

On May 3, 2013, at 5:15, Roland Jollivet roland.jolli...@gmail.com wrote:

 Ok, I did not know that.
 I would think though, that ripple and resolution are software issues which
 should be readily solvable for a particular motor with the complexity
 afforded by micros today, and only needs to be done once. The material cost
 savings though, accumulate.
 
 Regards
 Roland
 
 
 
 On 2 May 2013 23:04, N. Christopher Perry n_christopher_pe...@me.comwrote:
 
 They have a lot of torque ripple and are harder to micro step.  Given
 these factors their development is usually very targeted, so you won't
 generally find them lying about in surplus piles.
 
 For things like plasma and torch cutters they are probably a very cost
 effective alternative, if you can find them.
 
 N. Christopher Perry
 
 On May 2, 2013, at 14:38, Cogoman cogo...@optimum.net wrote:
 
 I believe I have seen them used to advance the roller on an electric
 typewriter. When the current is off, there's no cogging like hybrid
 steppers have. That makes adjust paper height by hand seem normal for a
 typewriter.
 Sent from my Kyocera Rise
 
 Roland Jollivet roland.jolli...@gmail.com wrote:
 
 Hi All
 
 Can anyone tell me if they are actually using variable reluctance
 motors as
 servos on CNC machines.
 
 I find it odd that such a simple motor is not in greater use. The only
 place I've ever seen them used was to position the head on old 8in
 floppy
 drives.
 Maybe they just don't have a good power to size ratio?
 
 Regards
 Roland
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Re: [Emc-users] Silly Q?

[N. Christopher Perry]

Modern PM motors using Neo magnets are less prone to weakening upon disassembly.

Wound field motors care even less about being disassembled.

N. Christopher Perry

On May 3, 2013, at 6:24, Gene Heskett ghesk...@wdtv.com wrote:

 On Friday 03 May 2013 06:13:12 Steve Blackmore did opine:
 
 On Thu, 2 May 2013 13:47:42 -0400, you wrote:
 Some brushed motors I have noted have the brush holders at small angles
 that aren't conducive to good brush life when running backwards, and
 which may also effect the motors torque when in reverse.  The OEM 400
 watters brushes are dead on center.
 
 As I said, my motor has the brushes at 90 deg to the armature, but it
 still runs slower backwards. It's not a skewed armature type, and the
 reverse relay simply swaps the polarity to the brushes so I'm not sure
 why.
 
 So, what is the general consensus about running one of these smaller
 treadmill motors backwards? (in the event I can actually make it fit
 where the old 400 watter was living)
 
 As long as it's adequately cooled, cant see it do any harm.
 
 Would a day or so's running at no load  medium speed re-seat the
 brushes and improve the brush life in that event?
 
 Should do.
 
 Steve Blackmore
 
 Good.  I just had a thought though Steve.  I wonder if the field frame 
 might be skewed?  If so, its sometimes possible to disassemble it and swap 
 the field end for end which should reverse any direction favoritism.  Or 
 are these things like steppers, where the PM can be seriously weakened by 
 removing it from its 'keeper', the stator frame?  I have read it from 
 several sources that a stepper armature will be permanently damaged by 
 pulling it out.  So I would assume these modern PM field dc motors would be 
 subject to the same warnings?
 
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Re: [Emc-users] Completely off topic. Kill-file on this key EntrenchedRanters

[N. Christopher Perry]

Those appear to have a lot of promise!  Especially as thorium reactors. 

N. Christopher Perry

On May 2, 2013, at 5:26, Mark Wendt wendt.m...@gmail.com wrote:

 On Wed, May 1, 2013 at 9:28 PM, andy pugh bodge...@gmail.com wrote:
 
 
 Yes. But free power makes that less of an issue.
 For example the steel structure will become embrittled and useless
 (hydrogen voids, etc) but it is still essentially nearly all elemental
 iron. Just accept that iron that is part of a fusion machine isn't
 much good for anything else afterwards, and re-smelt it into
 structurally sound material again.
 
 My next personal power supply is going to be a molten salt cooled pebble bed
 * *reactor.
 
 Mark
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Re: [Emc-users] variable reluctance motors

[N. Christopher Perry]

They have a lot of torque ripple and are harder to micro step.  Given these 
factors their development is usually very targeted, so you won't generally find 
them lying about in surplus piles.

For things like plasma and torch cutters they are probably a very cost 
effective alternative, if you can find them.

N. Christopher Perry

On May 2, 2013, at 14:38, Cogoman cogo...@optimum.net wrote:

 I believe I have seen them used to advance the roller on an electric 
 typewriter. When the current is off, there's no cogging like hybrid steppers 
 have. That makes adjust paper height by hand seem normal for a typewriter.
 Sent from my Kyocera Rise
 
 Roland Jollivet roland.jolli...@gmail.com wrote:
 
 Hi All
 
 Can anyone tell me if they are actually using variable reluctance motors as
 servos on CNC machines.
 
 I find it odd that such a simple motor is not in greater use. The only
 place I've ever seen them used was to position the head on old 8in floppy
 drives.
 Maybe they just don't have a good power to size ratio?
 
 Regards
 Roland
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Re: [Emc-users] Completely off topic. Kill-file on this key EntrenchedRanters

[N. Christopher Perry]

On May 1, 2013, at 19:57, andy pugh bodge...@gmail.com wrote:

 On 2 May 2013 00:33, Karl Schmidt k...@xtronics.com wrote:
 
 Assuming that charging is free - one can run the numbers and know that 
 battery powered cars are not
 at all practical.  The market is driven by people that want to feel good - ( 
 or superior? ) to
 alleviate their guilt of existence. Thus there is a real market.
 
 The other little detail is that electric cars actually consume MORE fuel per 
 energy delivered to the
 road than ICE cars.  There are losses at every conversion and transmission 
 step.
 
 There is a lot of Lithium available, however. And a lot of Thorium to
 burn in fission reactors to extract it. And when the batteries are
 dead, the Lithium is still Lithium, and it is still there. With a
 fossil-fuel engine all the carbon is just floating about in the
 atmosphere (or is adsorbed into people's lungs, which may be better or
 worse, depending on your viewpoint)
 
 The estimates are that if everyone in the world had the same energy
 consumption as the average US citizen, and we switched overnight to
 Thorium fission, then we would run out of known Thorium reserves in
 10,000 years.
 The number for Uranium is 20 years, but that is pessimistic as the
 commercial price for Uranium could rise by a factor of 100 without
 materially effecting the cost of the energy extracted. So Uranium
 fission can probably work for 400 years.
 
 For the whole of my life Fusion has been 20 years away. But given
 10,000 years to get it right, I am optimistic we can.
 
 [on topic] The big problem with Fusion has been fast real-time control
 of the containment fields. Moore's law is helping here[/on topic]
 
One thing you've overlooked is that everything near the fusion gets irradiated 
enough to be transmuted and generally into radioactive isotopes.  This is one 
of the factors that makes control difficult, as the plant is also changing 
continuously, as well as making maintainance a significant complication too.

 Electric cars are not clean, but they could be. Electric cars are not
 practical, but they will be.
 
 -- 
 atp
 If you can't fix it, you don't own it.
 http://www.ifixit.com/Manifesto
 

N. Christopher

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Re: [Emc-users] Completely off topic. Kill-file on this key EntrenchedRanters

[N. Christopher Perry]

A Physist I'd worked with had previously worked on the Tokamak and interacted 
with contemporaries at the NIF.  He got out of 'the business' due to what he 
concluded were nearly intractable engineering challenges.

As with most things, there are secondary and tertiary effects that even a 
'pure' fusion event will manifest that make everything in the facility 'hot' 
enough that you have to bury it for a couple of half lives after it is no 
longer functionally intact.

Given my personal experience at various synchrotrons, I'm inclined to agree 
with his conclusions.  

It may one day be practical (I certainly hope so) but it does no one any good 
to gloss over the realities of any technical challenge.

N. Christopher Perry

On May 1, 2013, at 21:56, Sebastian Kuzminsky s...@highlab.com wrote:

 On 05/01/2013 07:28 PM, andy pugh wrote:
 On 2 May 2013 02:18, N. Christopher Perry n_christopher_pe...@me.com wrote:
 
 One thing you've overlooked is that everything near the fusion gets 
 irradiated enough to be transmuted and generally into radioactive isotopes.
 
 Yes.
 
 No, that's not a universal truth.
 
 Different fusion reactions have different end products, and it's only 
 the neutral particles that irradiate the containment vessel.  Any fusion 
 end products that carry an electrical charge will be confined by the 
 magnetic containment field, along with the plasma that makes up the 
 fusion fuel.
 
 There are aneutronic fusion reactions which in theory can be made 
 completely clean.  (Avoiding unwanted side reactions is left as an 
 exercise for the reader.)
 
 For example:
 
 https://en.wikipedia.org/wiki/Fusion_power#D-3He_fuel_cycle
 
 
 -- 
 Sebastian Kuzminsky
 
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Re: [Emc-users] Machine documentation: software, best practices

[N. Christopher Perry]

Along the same lines:  What sort of suggestions does everybody have for 
organizing/commenting HAL and INI files.

Mine are starting to get a little hard to read.  I'm big on coding standards in 
general, as a big part of them is about code readability.  Is there a method 
any of you use to do the same?

N. Christopher Perry

On Apr 16, 2013, at 19:23, Gene Heskett ghesk...@wdtv.com wrote:

 On Tuesday 16 April 2013 19:05:57 andy pugh did opine:
 
 On 16 April 2013 10:49, propcoder marius.alks...@gmail.com wrote:
 electronics (power, drivers, custom electronics with documentation and
 all datasheets, cabling, signals, computer,..)
 
 I don't do anything for anyone other than myself, but I would be lost
 without the wiring details. (and it really needs to be down to the
 level of pin numbers in every connector, and the wire colours between
 them)
 
 It would be nice to be able to generate a nice HAL diagram, and there
 have been various ways to do that suggested, but I am not sure any
 have been shown to work properly.
 
 There was a thingy that I assume worked, I installed it last fall, but it 
 had one fatal flaw.  It tried to make the whole diagram fit on a single 
 sheet of paper, when, in order to have been able to read it with a 
 magnifying glass, it would have had to be done in multi-page poster style 
 that would have likely used 54 to 100+ sheets of paper to be taped together 
 before the text in one of the teeny little logic boxes would have been big 
 enough to read.
 
 It could have been quite valuable as a troubleshooting tool had it rendered 
 to a pdf that we could then have grabbed the sliders to move the screen 
 view to anyplace in it.  I tried to blow it up myself, but it rendered in 
 postscripts default 72 dpi, so it wasn't readable at any scale for the 
 diagram generated for my lathes, .hal files.
 
 I looked at the code to see if I could figure out how to fix it, but I 
 wasn't familiar enough with the language to understand it, let alone 
 troubleshoot it.
 
 Today, I don't even recall the name of it.  Sorry.  The mailing list 
 archive for last fall might contain a reference, as it is this list that 
 made me aware of it in the first place.
 
 Looking on the lathes box, I find a ~/gene/src/RockHopper directory that 
 looks like one of those usual suspects, was that it?
 
 Cheers, Gene
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Re: [Emc-users] Touch-Off Button

[N. Christopher Perry]

Du.  Staring right at it and not seeing it.

Never mind.

N. Christopher Perry


On 2013-Apr-5, at 22:59, Sebastian Kuzminsky wrote:

 On 04/05/2013 08:46 PM, N. Christopher Perry wrote:
 I've been reading the AXIS GUI documentation and it mentions a 'Touch Off' 
 button.  My installation doesn't display this and I can't figure out why?
 
 The Touch Off button is in the Manual Control tab (F3), in the upper 
 left.  Here's a picture:
 
 http://linuxcnc.org/docs/2.4/html/gui_axis.html#r1_3_4
 
 Does your Axis window not look like that?
 
 
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[Emc-users] Touch-Off Button

[N. Christopher Perry]

I've been reading the AXIS GUI documentation and it mentions a 'Touch Off' 
button.  My installation doesn't display this and I can't figure out why?  

I'm running EMC 2.4.6.  Here are my ini and hal files:

https://dl.dropbox.com/u/34705319/mini-mill.hal
https://dl.dropbox.com/u/34705319/mini-mill.ini

What am I missing?

N.C.
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Re: [Emc-users] Seasons Greetings

[N. Christopher Perry]

Happy Easter to you too, from New Hampshire.  Lovely end to a pleasant winter.

N. Christopher Perry

On Mar 31, 2013, at 5:22, Peter Blodow p.blo...@dreki.de wrote:

 Best wishes and happy Easter Holidays to all of you from snow-ridden 
 Bavaria!
 
 Peter
 
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Re: [Emc-users] Regarding OpenSCAD

[N. Christopher Perry]

I haven't used openscax, but have had mixed results with PyCAM.

For CAD I've been using SolveSpace with nice results.  It's a little limited 
(no helical sweeps and can't import geometry) but I is the only stable open 
source parametric tool I've found.  It can also export G-code, but you still 
need to put a rapper around it.

N. Christopher Perry

On Feb 21, 2013, at 13:45, Sebastian Kuzminsky s...@highlab.com wrote:

 On 02/21/2013 11:41 AM, Sebastian Kuzminsky wrote:
 I've used FreeCAD to make drawings for machining before.  Export as SVG,
 import the SVG into PyCAM, and get gcode out of PyCAM to feed to
 LinuxCNC on my mill.  That toolchain is not without its wrinkles and
 warts, but it can make good parts.
 
 I should have said: SVG for 2d stuff, STL for 3d stuff.  FreeCAD and 
 PyCAM handle both.
 
 
 -- 
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Re: [Emc-users] Need socket head 6x1mm by 35mm bolts

[N. Christopher Perry]

Have you checked McMaster-Carr?  They may not stock really low quantities, but 
prices are tolerable and there isn't a minimum buy.

N. Christopher Perry

On Jan 28, 2013, at 5:33, Mark Wendt wendt.m...@gmail.com wrote:

 On Mon, Jan 28, 2013 at 2:43 AM, Gene Heskett ghesk...@wdtv.com wrote:
 
 I have a long history in broadcasting with SS, much of it unpleasant
 because of its tendency to gaul, freeze and require bolt breaking (3/8
 bolts) strength just so it can be replaced, anywhere up to 2000' up in the
 air.  So I'm not real fond of putting an SS bolt into a casting that isn't
 readily replaceable.  These black iron grade 12's will be just fine.  They
 won't be out in the weather, at least on my watch. :)
 
 Thanks.
 
 Cheers, Gene
 
 That's why God invented Never-Seez.  ;-)
 
 Mark
 
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Re: [Emc-users] If true, sad news for us

[N. Christopher Perry]

Good luck  I just checked a couple of days ago an found they were sold out.

N. Christopher Perry

On Jan 23, 2013, at 11:12, Bruce Layne linux...@thinkingdevices.com wrote:

 I've been getting old Craig's List PCs that I was fairly sure would work 
 well with LinuxCNC for $75, and testing the latency with a Live CD 
 before buying them.  For the current project I wanted a little more 
 integration.  It's a CNC router that I expect to work in an environment 
 with a lot of wood dust, so I decided to put a small motherboard into 
 the sealed electrical enclosure to keep it from choking to death on fine 
 sawdust.  I got a D525MW Intel motherboard from NewEgg.com.  I loved 
 it!  Very easy setup, with only a few little BIOS tweaks to optimize it 
 for CNC appliance use.  With a power supply, RAM and a 64 GB solid state 
 SATA drive, it was almost $200, but it's a much nicer integrated 
 solution than basing a LinuxCNC machine on an old shabby looking used PC.
 
 I particularly liked that the low power Atom processor on the D525MW was 
 so efficient that it didn't need a lot of cooling, and Intel cleverly 
 designed it with a large vertical heat sink that uses only a little bit 
 of ambient airflow.  No processor fan is needed.  That low power 
 approach was perfect for LinuxCNC use, but most of the market seems to 
 be headed in the other direction.  Here's a comment from the article, 
 under a picture of one of seven soon-to-be-discontinued Intel motherboards.
 
 The DP55KG Kingberg for the short-lived LGA1156 CPUs featured a skull 
 made up of LEDs that would glow under load.
 
 Not that I don't like glowing skulls as much as the next guy, but that's 
 not a feature that I particularly care about in a LinuxCNC application.
 
 I liked the D525MW motherboard so much that I'm tempted to buy five of 
 them from NewEgg.com for future projects.
 
 
 
 On 01/23/2013 09:35 AM, Matt Shaver wrote:
 http://www.maximumpc.com/article/news/intel_quit_making_motherboards2013
 
 I hope that other manufacturers MiniITX boards prove as good performing
 on latency-test as the ones from Intel.
 
 Thanks,
 Matt
 
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Re: [Emc-users] Single Pulse Output?

[N. Christopher Perry]

I considered something like that.  The complexity is that there isn't another 
parallel port pin I can trust to indicate when the PC comes on for use as an 
interlock, and the aux power supplies and drives do not power up at the same 
time as the PC.

I've settled on having a 555 timer energize a NO relay after a ~10s delay.  
I'll have the power from an unused USB port power the 555 delay circuit, and 
the relay will provide isolation to reduce the potential for ground loops.  I 
checked the timing and that parallel port pin and the USB port come up within a 
couple of ms of each other.

N. Christopher Perry

On Dec 3, 2012, at 10:15, Jason Burton lathebuil...@gmail.com wrote:

 How about a capacitor based delay circuit?
 
 AND-gate it with your one shot pin.
 
 When power is off, capacitor bleeds empty through a resistor to ground.
 
 On power up, the delay circuit is held low until the cap is charged. It
 stays charged until power is shut off again.
 
 Set the output enable threshold with a zener diode perhaps (if the AND
 gate doesn't give an on voltage you like) and the delay with capacitance
 size.
 
 Best,
 Jason
 On Dec 2, 2012 2:31 PM, N. Christopher Perry n_christopher_pe...@me.com
 wrote:
 
 Thank you John and Andy.  I've got my machine working almost exactly the
 way I want: When my spindle is enabled/disabled I have a oneshot triggering
 a port pin connected to a modified wireless remote for my vacuum system.
 
 Now I just need to build a workaround for the ~4 s pulse I get on that
 port pin when the computer is turned on...  I'm guessing I need to wire in
 a delay-on-make lockout for the vacuum remote connection that triggers on
 some output on the computer.
 
 N.C.
 
 On 2012-Nov-12, at 05:01, andy pugh wrote:
 
 On 12 November 2012 02:18, John Kasunich jmkasun...@fastmail.fm wrote:
 
 man oneshot from the command line should get you the documentation.
 
 Or the HTML docs:
 http://www.linuxcnc.org/docs/html/man/man9/oneshot.9.html
 Note that you can set it to produce a pulse on both the rising and
 falling edge, so if you net-ed it to halui.machine,is-on you would get
 a pulse when you turned the machine on or off (F2 key in axis)
 You need to enable halui to get that pin:
 http://www.linuxcnc.org/docs/html/gui/halui.html
 I don't know if you get the pulse, or how long it would be, if you
 exit LinuxCNC without turning the machine off.
 
 Note that oneshot has the time resolution of the thread it is in. So
 1mS resolution in the typical servo thread.
 It can't run in the base thread.
 
 
 
 
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Re: [Emc-users] Single Pulse Output?

[N. Christopher Perry]

I considered that, but I'm not convinced they will have consistent enough 
behavior.  

I really want a more definitive solution. 

N. Christopher Perry

On Dec 3, 2012, at 10:35, andy pugh bodge...@gmail.com wrote:

 On 3 December 2012 15:15, Jason Burton lathebuil...@gmail.com wrote:
 How about a capacitor based delay circuit?
 
 AND-gate it with your one shot pin.
 
 That sounds a little over-complex.
 It is probably simpler to find a better-behaved parallel port pin.
 They will tend to change state on power-up. Some are hardware
 inverted. Choosing to use (or avoid) the hardware-inverted ones might
 be the solution.
 
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Re: [Emc-users] Single Pulse Output?

[N. Christopher Perry]

Thank you John and Andy.  I've got my machine working almost exactly the way I 
want: When my spindle is enabled/disabled I have a oneshot triggering a port 
pin connected to a modified wireless remote for my vacuum system.

Now I just need to build a workaround for the ~4 s pulse I get on that port pin 
when the computer is turned on...  I'm guessing I need to wire in a 
delay-on-make lockout for the vacuum remote connection that triggers on some 
output on the computer.

N.C.

On 2012-Nov-12, at 05:01, andy pugh wrote:

 On 12 November 2012 02:18, John Kasunich jmkasun...@fastmail.fm wrote:
 
 man oneshot from the command line should get you the documentation.
 
 Or the HTML docs: http://www.linuxcnc.org/docs/html/man/man9/oneshot.9.html
 Note that you can set it to produce a pulse on both the rising and
 falling edge, so if you net-ed it to halui.machine,is-on you would get
 a pulse when you turned the machine on or off (F2 key in axis)
 You need to enable halui to get that pin:
 http://www.linuxcnc.org/docs/html/gui/halui.html
 I don't know if you get the pulse, or how long it would be, if you
 exit LinuxCNC without turning the machine off.
 
 Note that oneshot has the time resolution of the thread it is in. So
 1mS resolution in the typical servo thread.
 It can't run in the base thread.
 


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[Emc-users] Spindle Control on the AXIS Interface

[N. Christopher Perry]

I started experimenting with spindle control and have found some odd behavior.  
I added the example HAL content from section 2 of this page 
http://linuxcnc.org/docs/html/examples/spindle.html.  

Got a error when I launched AXIS.  Removed this line from the HAL file, which 
cleared the error: net spindle-cmd = motion.spindle-speed-out (this was part 
of the HAL file Stepconf generated)

After removing that line AXIS launched without incident, but when I enable the 
spindle (F9) and try adjusting the speed, ether by clicking the '+' / '-' 
buttons or pressing F11/F12 I only get ~1%  100% PWM duty.  If I enter an S 
code in the MDI command window I get full fidelity.  

Here is a link to a copy of my HAL file: 
https://www.dropbox.com/s/hgq3jqvmzajwi72/mini-mill.hal

Any suggestions about what might be going on?

I'm running 2.4.6.

N.C.
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Re: [Emc-users] Spindle Control on the AXIS Interface

[N. Christopher Perry]

Ahh..  I see that I've managed to shoot myself in the foot:  I'd set it to 100 
so I could more easily evaluate duty cycle increments.  That will not remain at 
that low a value in service.

Thank you for the quick response.

On 2012-Nov-11, at 17:25, andy pugh wrote:

 On 11 November 2012 22:04, N. Christopher Perry
 n_christopher_pe...@me.com wrote:
 
 After removing that line AXIS launched without incident, but when I enable 
 the spindle (F9) and try adjusting the speed, ether by clicking the '+' / 
 '-' buttons or pressing F11/F12 I only get ~1%  100% PWM duty.
 
 The Axis UI increments the spindle speed in fixed increments of 100rpm
 (Code here from command.c)
 case EMCMOT_SPINDLE_INCREASE:
   rtapi_print_msg(RTAPI_MSG_DBG, SPINDLE_INCREASE);
   if (emcmotStatus-spindle.speed  0) {
   emcmotStatus-spindle.speed += 100; //FIXME - make the step a 
 HAL parameter
   } else if (emcmotStatus-spindle.speed  0) {
   emcmotStatus-spindle.speed -= 100;
   }
   break;
 
 You have an unusually low spindle speed range (0 to 100 rpm) so the
 very first increment press takes you straight to your max spindle
 speed of 100rpm.
 Note that even here it is acknowledged in the code that this isn't
 quite right...
 
 -- 
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[Emc-users] Single Pulse Output?

[N. Christopher Perry]

Is there a way to have a parallel port output generate a single pulse on 
command?  I have a vacuum system that requires a pulse to turn it on/off, and 
would like to have my machine turn the vacuum on automatically.

N.C.

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Re: [Emc-users] Single Pulse Output?

[N. Christopher Perry]

A 1 s pulse, +/-0.25 s, with +/-0.25 s timing accuracy would be adequate.

N.C. 

On 2012-Nov-11, at 20:09, John Kasunich wrote:

 On Sun, Nov 11, 2012, at 07:44 PM, N. Christopher Perry wrote:
 Is there a way to have a parallel port output generate a single pulse on
 command?  I have a vacuum system that requires a pulse to turn it on/off,
 and would like to have my machine turn the vacuum on automatically.
 
 How long of a pulse?  How precise does the length need to be?
 
 HAL has a one-shot component, that generates a pulse its 
 input signal changes state.  Might do what you need.
 
 
  John Kasunich
  jmkasun...@fastmail.fm
 
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Re: [Emc-users] Current Sensors

[N. Christopher Perry]

I really prefer sensors made by these guys:  http://www.lem.com

These are the sensors used in a number of VVF drives used in high reliability 
applications.

N.C.

On 2012-Mar-18, at 13:00, Kirk Wallace wrote:

 These look pretty handy:
 http://www.pololu.com/catalog/product/1187 
 
 I'm thinking about ways to add load sensing for drives that don't have
 this feature yet. Also, I wonder if they are fast enough for PWM signal
 control?
 
 Digikey has some other models of these sensors but it seems for my
 purposes, the  working voltage isn't high enough, or the current range
 is too wide and some resolution is lost.
 
 Current can also be measured with an opamp measuring voltage across a
 current sense resistor, but I'm worried about a common mode voltage in
 the hundreds of Volts. Is there away to handle this?
 -- 
 Kirk Wallace
 http://www.wallacecompany.com/machine_shop/
 http://www.wallacecompany.com/E45/index.html
 California, USA
 
 
 
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Re: [Emc-users] Stupid LinuxCNC Tricks

[N. Christopher Perry]

Outstanding!

N. Christopher Perry

On Oct 23, 2012, at 23:38, Charles Steinkuehler char...@steinkuehler.net 
wrote:

 delta-arm 3D printer

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Re: [Emc-users] Gluing little balls

[N. Christopher Perry]

Edge cure grades might address that issue.  They are specifically designed for 
those sorts of situations.  Check out Loctite UV cure epoxies. 

N. Christopher Perry

On Oct 10, 2012, at 4:32, andy pugh bodge...@gmail.com wrote:

 On 10 October 2012 03:53, Dave e...@dc9.tzo.com wrote:
 
 I'd look into glue that sets via ultraviolet light, so you don't have to
 deal with it setting up in the equipment.
 
 UV might not get to where it is needed through wood and coloured glass.
 
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Re: [Emc-users] Gluing little balls

[N. Christopher Perry]

The transmission curve for glass doesn't permit UV.  That wouldn't be a good 
application for UV cure compounds.

N. Christopher Perry

On Oct 10, 2012, at 6:34, yann jautard brico...@free.fr wrote:

 
 Le 10/10/2012 10:32, andy pugh a écrit :
 On 10 October 2012 03:53, Dave e...@dc9.tzo.com wrote:
 
 I'd look into glue that sets via ultraviolet light, so you don't have to
 deal with it setting up in the equipment.
 UV might not get to where it is needed through wood and coloured glass.
 
 I agree with Andy, I'm pretty sure this can't work.
 
 I already tested UV curing glue for solar panel assembly, and I wasn't 
 able to get the UV pass trough the solar panel glass. And solar panel 
 glass are extra clear glass that should not block any light...
 
 
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Re: [Emc-users] Gluing little balls

[N. Christopher Perry]

How about a light/UV cure adhesive?  Look up Loctite 5055 or 5056.  Drop the 
ball in, give a little squirt of one of these, then hit it with the light from 
a bunch of UV LEDs in the 320 nm - 420 nm range.  These sorts of LEDs are 
readily available now for just over a buck each.

N. Christopher Perry

On Oct 9, 2012, at 15:03, craig cr...@facework.com wrote:

 Thanks all for several interesting ideas.   I am currently reviewing 
 responses.
 
 most of the equipment and the control software for ball pick and place 
 from several bins of balls has been designed and built and tested, but 
 is not yet mounted on the machine or tested all together.  I think the 
 difficult part of pick and place is done.
 
 I have considered the following approaches to glueing balls into the 
 cavities.
 
 1.  a. dispensing a hot melt glue into cavities (exact method to be 
 determined)
   b.  placing balls where desired (possibly only partially in 
 the indentation)
   c1. pressing down on the balls with a heated plate or iron  
 (more efficient and elegant)
   c2. heating in oven then pressing down.  (less equipment)
 The only obvious problem seems to be dispensing hot melt glue onto the 
 cavity walls.
 
 Using  equipment made for reprap experimenters might work if I can find 
 a clear hot melt glue in the thin diameter form factor.
 Moving small rods of material seems easier than variable viscosity liquids.
 Dispensing the small ammount needed (aprox .01 - .02 cc) seems much more 
 difficult using much larger diameter glue sticks.
 
 2. dipping the boards
  The problem is surface clean up.  The wood surface should remain 
 appealing without coating the ball tops with anything.
 if dipped  and dried before placing balls.  The surfaces could be 
 sanded after drying.  What liquid clear adhesive  can I activat after 
 drying, method?
 
 
 3. dipping the marbles
 How can one remove the glue from the top surface of protruding 
 marbles without causing problems to the surrounding wood surfaces?
 
 4. I will give some thought to dispensing and smearing liquid adhesives, 
 or heated hot melt adhesives with brushes or flaps.
 
 craig
 
 On 10/9/2012 9:52 AM, dave wrote:
 On Tue, 2012-10-09 at 08:24 -0400, Bruce Layne wrote:
 I have a suggestion that's maybe not quite as snarky as Charles'
 suggestion, but still in the direction of maybe you're optimizing the
 wrong problem.
 
 If I were placing approximately 10,000 marbles or less, I probably
 wouldn't try to develop a method of having the machine do it.  I'd make
 relatively minor changes to optimize the operation for manual assembly.
 
 I have an EFD 1500XL fluid dispensing system.  It has a couple of
 operating modes, but in this case, it's basically a syringe full of
 epoxy with a regulated air supply that can be applied over the epoxy to
 precisely dispense it through a needle.  Press the foot pedal and a thin
 bead of epoxy is dispensed as you move the tip of the needle around the
 upper rim of the concave pocket.  Release the foot pedal and a slight
 vacuum is applied over the epoxy in the syringe to keep it from
 dripping.  The positive pressure can be adjusted for the flow rate you
 want, and the vacuum can be adjusted for the fluid pull-back you want
 for your application.  It's now a one handed operation, leaving your
 other hand free for placing marbles.  You can buy a used EFD on eBay,
 probably for $100, use it for this project, and then sell it for what
 you paid for it.
 
 Dispensing epoxy is a bit tricky, because it's curing in the syringe,
 and the viscosity is changing.  The trick is to use a slow epoxy with a
 6 hour cure rate, and that should give you a 1-2 hour working pot life.
 You might need to bump up the dispense pressure slightly toward the
 end.  Slow epoxies tend to be watery.  If you want thicker epoxy to give
 you a little more time to place the marble, you can mix in materials
 like cabosil to increase the viscosity to make it easier to use on
 vertical surfaces, and use a larger bore needle.
 
 I recommended this approach because we often tend to focus our
 efficiency efforts on making the machine do all of the work, but many
 times, the fastest CNC throughput is achieved by an appropriate division
 of labor between the machine and the operator.  For example, if the
 machine was a blur-of-motion SCARA assembly robot that could place all
 of the adhesive and marbles in five seconds, that's five seconds added
 to the cycle time.  If the operator is placing the adhesive and marbles,
 all you'd need to do is keep up with the machine's ability to make the
 holes and there would be no increase in cycle time.  Basically, if
 you're trying to maximize the rate of production, it does you no good at
 all to devise some clever method for the machine to dispense epoxy and
 perform a pick and place operation with the marbles, if that leaves you
 standing there watching the machine with nothing to do but juggle your

Re: [Emc-users] Interesting

[N. Christopher Perry]

We aren't.  I've been hearing from Linux jockeys that these boards are great 
for low power server applications.

N. Christopher Perry

On Oct 2, 2012, at 13:52, andy pugh bodge...@gmail.com wrote:

 Newegg have the D525 in stock, with a rather curious Limit 5 per customer.
 Perhaps we are not the only fans?
 
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Re: [Emc-users] Helical interpolation not quite round, WTF?

[N. Christopher Perry]

Igor,

I don't have an answer for you, other than to check on how you've defined you 
trajectory planning accuracy outside of this routine.

Why are you using two half circles?  You could just send the cutter back to the 
starting xy location in a single G2 instruction.

N. Christopher Perry

On Sep 25, 2012, at 14:20, Igor Chudov ichu...@gmail.com wrote:

 I have a routine that lets me mill a deep circle in several passes,
 typically to cutout circles from plates.
 
 Something strange is going on and the resulting shape is not exactly round.
 It can be best described as a circle with humps.
 
 The routine is below. It is basically a while loop, milling progressively
 deeper until Z reaches the required depth. Every loop consists of two half
 circles milled helically, with the end mill going down along a spiral.
 
 Any idea why the shape may not end up being circular?
 
 Thanks
 
 Routine attached.
 
 (Copyright - Igor Chudov, released under GNU Public License V3)
 
 Ocirculargroove sub (circular groove, good for milling through holes too)
  #xc = #1 (X center)
  #yc = #2 (Y center)
  #safez  = #3 (safe height)
  #depth  = #4 (depth of milling)
  #radius = #5 (outside radius)
  #milld  = #6 (end mill diameter)
  #frate  = #7 (feed rate)
  #zstep  = #8 (z step, per circle, optional)
 
  Oif if [ #frate NE 0 ]
F#frate
  Oif endif
 
  Oif if [ #zstep EQ 0 ]
#zstep = [#milld/3]
  Oif endif
 
  #z = #safez
  #r = [#radius - #milld/2]
 
  G0 Z#safez
  G4 P0
  G0 X[#xc + #r] Y#yc
 
  Oloop while [ 1 ]
 
Oif if [ #z - #zstep LT #depth]
  #zstep = [#z - #depth]
Oif endif
 
G2 X[#xc - #r] Y#yc Z[#z - #zstep/2] R#r
G2 X[#xc + #r] Y#yc Z[#z - #zstep] R#r
 
#z = [#z - #zstep]
 
Oif if [ #z LE #depth ]
  Oloop break
Oif endif
 
  Oloop endwhile
 
  G2 X[#xc - #r] Y#yc R#r
  G2 X[#xc + #r] Y#yc R#r
 
  G0 Z#safez
 
 Ocirculargroove endsub
 
 M2
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[Emc-users] Bridgeport Stepper Inductance

[N. Christopher Perry]

I've got an old CNC Bridgeport Vertical Mill I'm looking to upgrade.  I'm 
fairly sure it is a BOSS 5.  It does have stepper motors on in, but haven't had 
a chance to check whether they are Superiors or Sigmas motors yet.  Except for 
the motors, it looks exactly like this:  
http://img.photobucket.com/albums/v12/rockrat/new/DSC01640.jpg

Anyway, I've got some Parker OEM650 stepper drives on hand and would like to 
use those for my retrofit, but they will only accommodate phase inductances of 
1 - 10 mH.  Does anyone know what the inductances are for the Superiors and 
Sigmas?

N.C.
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Re: [Emc-users] Bridgeport Stepper Inductance

[N. Christopher Perry]

On Aug 30, 2012, at 11:05, Kirk Wallace kwall...@wallacecompany.com wrote:

 On Thu, 2012-08-30 at 08:55 -0400, N. Christopher Perry wrote:
 I've got an old CNC Bridgeport Vertical Mill I'm looking to upgrade.
 I'm fairly sure it is a BOSS 5.  It does have stepper motors on in,
 but haven't had a chance to check whether they are Superiors or Sigmas
 motors yet.  Except for the motors, it looks exactly like this:
 http://img.photobucket.com/albums/v12/rockrat/new/DSC01640.jpg
 
 Anyway, I've got some Parker OEM650 stepper drives on hand and would
 like to use those for my retrofit, but they will only accommodate
 phase inductances of 1 - 10 mH.  Does anyone know what the inductances
 are for the Superiors and Sigmas?
 
 N.C.
 
 Someone is bound to say this, so it might as well be me.
 
 From what I hear, the original Boss stepper motor magnets where probably
 the best they had at the time, but now are pretty awful. I would be
 inclined to not put any money into the present steppers. I would try to
 get it running with what you had on hand and see if you can live with
 it, or go to a servo system (brushed or brushless).
 

I plan to, but I can't commit to swapping them out upfront while upgrading 
everything else in the system.

N.C.

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Re: [Emc-users] Bridgeport Stepper Inductance

[N. Christopher Perry]

I hear you, but I've already got the Parker drives, they are at least as bullet 
proof, and they're free in my case.

I'd rather not drop an extra $420 for the 203v drives.

N. Christopher Perry

On Aug 30, 2012, at 10:17, John Murphy j...@wyosip.com wrote:

 I'll second the 203V for a Boss upgrade.  Quick and easy.
 
 On Thu, Aug 30, 2012 at 7:33 AM, Matthew Herd herd.m...@gmail.com wrote:
 I've got an old CNC Bridgeport Vertical Mill I'm looking to upgrade.  I'm 
 fairly sure it is a BOSS 5.  It does have stepper motors on in, but haven't 
 had a chance to check whether they are Superiors or Sigmas motors yet.  
 Except for the motors, it looks exactly like this:  
 http://img.photobucket.com/albums/v12/rockrat/new/DSC01640.jpg
 
 As an aside, I'm reasonably sure it's a BOSS 3 because your 7 segment 
 display has too few digits.  A BOSS 4/5/6 has a 3 digit display and a 5 
 digit display, whereas I can see from the picture, you only have a 5 digit 
 display.  See http://www.centroidcnc.com/bridgeport_boss.htm for a picture 
 of a BOSS 5 pendant with the larger display.  I think the heatsinks on the 
 steppers also tell you that it's a 3, but I don't know that for certain.
 
 
 
 Anyway, I've got some Parker OEM650 stepper drives on hand and would like 
 to use those for my retrofit, but they will only accommodate phase 
 inductances of 1 - 10 mH.  Does anyone know what the inductances are for 
 the Superiors and Sigmas?
 
 I can't answer this one with certainty, but the G203V tolerates 1-50 mH and 
 it works well with the steppers on my BOSS.
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Re: [Emc-users] Emc-users Digest, Vol 76, Issue 124

[N. Christopher Perry]

Thank you for the effort...  I guess I will have to put off this project a bit 
longer.  At least until I can purchase some suitable drives.

N. Christopher Perry

On Aug 30, 2012, at 11:01, Matthew Herd herd.m...@gmail.com wrote:

 
 
 
 Anyway, I've got some Parker OEM650 stepper drives on hand and would like 
 to use those for my retrofit, but they will only accommodate phase 
 inductances of 1 - 10 mH.  Does anyone know what the inductances are for 
 the Superiors and Sigmas?
 
 I can't answer this one with certainty, but the G203V tolerates 1-50 mH and 
 it works well with the steppers on my BOSS.
 
 Actually, I took a quick look at the specs for the parker drives.  It seems 
 the most it can handle is a NEMA 34.  Looking at the specs on the Keling 
 website for NEMA 34  42 motors, it seems that the inductance in series (what 
 I suggest for lower current drives) is going to be significantly higher than 
 10 mH.  I think they were consistently over 10 mH, with the 42's at like 64 
 mH.  The BOSS motors should be in the same neighborhood, so they will 
 probably be too high for the Parker drives.  Just a little inductive 
 reasoning here, I have never measured the motor inductance nor could I find 
 reliable specs.
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Re: [Emc-users] Stepper Inductance

[N. Christopher Perry]

I might pull one of the motors off the machine and bring it into work.  We have 
an LCR meter here that would eliminate the guesswork.

N. Christopher Perry

On Aug 30, 2012, at 15:04, Matthew Herd herd.m...@gmail.com wrote:

 
 Thank you for the effort...  I guess I will have to put off this project a 
 bit longer.  At least until I can purchase some suitable drives.
 
 Well, if the drives are adequately protected, which I'm sure they are, it 
 wouldn't hurt to hook them up and try ... 
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Re: [Emc-users] Bridgeport Stepper Inductance

[N. Christopher Perry]

That great info.  Thank you!

If they were 1-2 mH in unipolar mode, then when parallel connected for bipolar 
mode operation they should be closer to 2-4 mH, which is just about right.

I'll confirm this with an LCR meter.

N. Christopher Perry

On Aug 30, 2012, at 15:20, Steve Stallings steve...@newsguy.com wrote:

 The Superior Slo-Syn motors used by Bridgeport were
 8 wire M112-FJ series motors wired in a 6 wire unipolar 
 configuration. These motors should have an inductance
 of between 1 and 2 mHenry per winding and were rated
 for 9 amperes in unipolar mode. This is a guess based
 on their product chart for standard models with similar
 ratings. I do not know the exact motor used by Bridgeport,
 or even if it was a custom.
 
 The Sigmas should be similar.
 
 If anything, the inductance may be borderline too low
 for your Parkers. 
 
 The typical stepper Bridgeport using original motors
 will run 80 to 100 IPM using G203V drivers with a
 72 volt nominal power supply. The servo Bridgeports
 like the Boss-8 would run about 200. Pushing things
 beyond that would likely over stress the mechanicals.
 
 Regards,
 Steve Stallings
 
 -Original Message-
 From: N. Christopher Perry [mailto:n_christopher_pe...@me.com] 
 Sent: Thursday, August 30, 2012 12:20 PM
 To: Enhanced Machine Controller (EMC)
 Subject: Re: [Emc-users] Bridgeport Stepper Inductance
 
 
 On Aug 30, 2012, at 11:05, Kirk Wallace 
 kwall...@wallacecompany.com wrote:
 
 On Thu, 2012-08-30 at 08:55 -0400, N. Christopher Perry wrote:
 I've got an old CNC Bridgeport Vertical Mill I'm looking 
 to upgrade.
 I'm fairly sure it is a BOSS 5.  It does have stepper motors on in,
 but haven't had a chance to check whether they are 
 Superiors or Sigmas
 motors yet.  Except for the motors, it looks exactly like this:
 http://img.photobucket.com/albums/v12/rockrat/new/DSC01640.jpg
 
 Anyway, I've got some Parker OEM650 stepper drives on hand 
 and would
 like to use those for my retrofit, but they will only accommodate
 phase inductances of 1 - 10 mH.  Does anyone know what the 
 inductances
 are for the Superiors and Sigmas?
 
 N.C.
 
 Someone is bound to say this, so it might as well be me.
 
 From what I hear, the original Boss stepper motor magnets 
 where probably
 the best they had at the time, but now are pretty awful. I would be
 inclined to not put any money into the present steppers. I 
 would try to
 get it running with what you had on hand and see if you can 
 live with
 it, or go to a servo system (brushed or brushless).
 
 
 I plan to, but I can't commit to swapping them out upfront 
 while upgrading everything else in the system.
 
 N.C.
 
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Re: [Emc-users] Final user of EMC2.

[N. Christopher Perry]

 On Wed, Aug 15, 2012 at 09:42:18PM -0400, John Kasunich wrote:
 
 Do you delete word processor files from the file open menu
 of the word processor?  Do you delete spreadsheets from the
 file open menu of the spreadsheet program?  NO.
 
 In ms office in windows, you can in fact rename/move/delete
 files in the file OPEN dialog box.  It is an abomination.
 
But, on the other hand, it is very useful.  I use these features on a regular 
basis. 

I'm not terribly interested if it is an 'abominaton' if it helps me get the job 
done.

N.C.

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[Emc-users] http://www.linuxcnc.org/wiki/uploads/cp1.tgz

[N. Christopher Perry]

Hello,

I was looking through the wiki for some g-code tools and came across references 
to CP1.  The link to the tarball is broken...  Anyone know where I can download 
this?

N.C.

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Re: [Emc-users] Boss 5 Conversion

[N. Christopher Perry]

Mike,

Awesome.  Thank you for the download.

I'm considering using some surplus Parker OEM750 drives on mine, but will take 
a closer look at the Gecko hardware.

N.C.

On Jun 29, 2012, at 9:59, Michael Panchula panch...@umich.edu wrote:

 I converted my Boss 5 to PC based, 220V single phase power. I kept the
 stock steppers.
 
 Here's a quick parts breakdown:
 
 *Power *
 Stepper Power Suppy:
 Antek 48V toroidal trasformer AN-10248 1000VA
 PMDX-135-8020 20A power prep module
 
 Relay Power Supply:
 El-Pac BFS-500 24V 20A
 
 Logic Power Supply:
 Spare PC 150W PS
 
 *VFD*
 TB Woods SE-1 2HP VFD
 
 *PC *
 Gateway Pentium 4 3.0Ghz
 *
 *
 *Display*
 NEC 15 LCD Touchscreen
 *
 *
 *PC interface boards*
 C11G Break out board
 C10 Breakout board
 Netmos based PCI parallel port
 
 *Stepper Drivers*
 Gecko 203V
 
 *Relays*
 Various 24v relays controlling  VFD, Stepper PS, tied in to E-Stop
 
 
 Build notes:
 Removed the entire back cabinet.
 
 In the side cabinet where the tape drive lived, I put in a 3/4 MDF board
 and use it for tool storage.
 
 I removed the heatsinks from the right side of the remaining control box.
 I covered the opening with a blank. I separated the heatsinks and cut one
 down to mount it the opening on the back wall of the control cabinet and
 mounted the Geckos to it.  No problem keeping them cool.
 
 Per Marcus from Gecko -- wire the stock steppers in series, no current
 resistor on drvie.   I also installed a capacitor across the supply leads
 to each Gecko (don't remember the value off the top of my head).
 
 I reused the existing spindle enable and e-stop on the head for enabling
 the stepper power, and on the e-stop I wired the stepper power to the NC
 side of the switch and the Gecko disable to the NO.  In e-stop the relay
 shuts off the power to the steppers and VFD, and the disable turns off the
 drives while the power supply drains down.  Not to say this is the best
 way, just how I did it.
 
 Getting the Netmos based PCI card configurred under Linuxcnc was a bit
 tricky, but thanks to Jon's PCIsetup utility, I got it tamed.
 
 My Boss 5 has two different brands of steppers,  Sigma on the X  Y,
 Superior on the Z.   I'm currently running 60 IMP rapids on the X  Y, and
 can only get 45 out of the Superior on the Z.  I just bought a spare
 Superior at the CNC Workshop, and it's consistent, 45 IPM.
 
 One other tip -- use wire ferrules on all the connections, they make a
 neater and more robust connection.  McMaster-Carr has a nice assortment
 pack for ~$30.
 
 The touch screen works well, there was just a new driver released by 3M
 this spring.
 
 I hope this is of use.
 
 -Mike
 
 
 
 
 
 
 
 
 
 
 *
 *
 
 
 
 
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Re: [Emc-users] Installing an MPG Pendant

[N. Christopher Perry]

What is the syntax for doing that?

N. Christopher Perry

On Jun 19, 2012, at 6:26, andy pugh bodge...@gmail.com wrote:

 On 19 June 2012 06:19, Anders Wallin anders.e.e.wal...@gmail.com wrote:
 
 some googling suggests that PCIe parallel ports don't have any
 standard address, and the address may even change at each bootup,
 
 If that is the case, then referring to the parports as 0 and 1
 rather than by address in the loadrt hal_parport line is probably the
 better solution. hal_parport can work with parport_pc to identify
 parallel ports by index rather than by explicit address.
 
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Re: [Emc-users] Installing an MPG Pendant

[N. Christopher Perry]

I did reboot the system and recheck the address reported by lspci, which was 
the same.  That may not be very definitive, but at least serves as a data point.

Unfortunately the card doesn't appear to show up in the bios setup.  I'll check 
again.

N. Christopher Perry

On Jun 19, 2012, at 1:19, Anders Wallin anders.e.e.wal...@gmail.com wrote:

 I updated my HAL file accordingly:
 
 loadrt hal_parport cfg=0x378 0xec00 in # Added 2012-Jun-18, NCP
 
 
 some googling suggests that PCIe parallel ports don't have any
 standard address, and the address may even change at each bootup, or
 it may be software configurable on the PCIe card.
 I'm guessing the ec00 above is the problem. Does the PCIe card have
 a BIOS-like setup menu of its own? Can you see or set the address
 there?
 
 AW
 
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Re: [Emc-users] Installing an MPG Pendant

[N. Christopher Perry]

Snip:

 On 19 June 2012 12:27, N. Christopher Perry n_christopher_pe...@me.com 
 wrote:
  What is the syntax for doing that?

 http://www.linuxcnc.org/docview/html/hal/parallel_port.html

 Suggests that
 loadrt hal_parport cfg=0 1 in
 Ought to work.

 -- 
 atp
 
Atp,

Thank you for the info and pointer.  Reading through the linked page I found a 
mention of a similar error connected with 'parpart_pc' and 'probe_parport'.  I 
commended out the 'loadrt probe_parport' and I'm getting motion with the 
pendant!

Still needed to poke around to get the basics working, but I've got most of the 
functionality I'm looking for. 

All,

Thank you all for the help.

N.C.


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