Re: [Emc-users] RepRap RAMPS stepper controller board with LinuxCNC?

[Charles Steinkuehler]

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On 6/13/2012 8:42 PM, Scott Hasse wrote:
> 1) Many of the output pins are step/dir which of course will
> require real time control, but others things like heater outputs,
> etc, that would not suffer too much from increased latency.  Has
> anyone used a latching shift register for extending parallel port
> output for cases where latency is less of a concern?

I'm not aware of anything specifically like this.  The Mesa folks (and
others) use the parallel port in EPP mode and get something like what
you're talking about.  I've considered taking the AVR and using it as
a "poor-man's" Mesa, but I'm not sure it's going to be worth the hassle.

It would provide a fairly easy way to expand the I/O, and get full
support for multiple analog channels via the A/D.

> 2) I've gotten some basic encoder-based frequency-based analog
> input working in other scenarios ( 
> http://code.google.com/p/sector67-sandbox/wiki/FrequencyBasedAnalogInput)
>
> 
and plan to use that for the analog temperature inputs on the parallel port
> if feasible.  Does that seem reasonable?

It seems perfectly reasonable.  I am planning on just using something
like a 555 timer to convert the thermistor resistance into a frequency
that can be sampled by the HAL parallel port or (if I need more
resolution) using the analog audio input and something like aubiopitch.

> 3) Has anyone else done anything similar to this?  I've followed
> the http://reprap.org/wiki/EMCRepRap effort, but that doesn't use
> the RAMPS board.  I expect the user interface and gcode translation
> tools from that project to be quite useful.

I think I'm heading down pretty much exactly the same path you are,
although I've been recently side-tracked actually trying to assemble
my MendelMax 3D printer.

I picked up some proto-shield boards cheap off eBay (see item
280871493314), which I plan on using to replace the Arduino by tying
directly to the parallel port.

...but first I have to finish the 3D printer, which is *ALMOST* done.

*wanders off to work on the wiring harness*

- -- 
Charles Steinkuehler
char...@steinkuehler.net
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[Emc-users] RepRap RAMPS stepper controller board with LinuxCNC?

[Scott Hasse]

All-

I am starting in with some experiments using the RepRap RAMPS board (
http://reprap.org/wiki/Arduino_Mega_Pololu_Shield) (basically a 3-5 axis
small stepper driver board with additional heater outputs and temperature
inputs), but instead of using an Arduino with firmware like sprinter for
controlling it, I plan to use LinuxCNC with a parallel port.  To that end
I've acquired an Intel 525MW board and am so far very pleased with it.  To
adapt a parallel port to drive the RAMPS board, I plan to make a small
circuit board with the same footprint as the Arduino shield that would
normally drive the RAMPS board, but route the parallel port pins instead to
the shield headers.

I am expecting this will generally be fairly straightforward, and there is
just barely enough parallel I/O to be workable, but I have a few questions
that I thought I would run by you all:

1) Many of the output pins are step/dir which of course will require real
time control, but others things like heater outputs, etc, that would not
suffer too much from increased latency.  Has anyone used a latching shift
register for extending parallel port output for cases where latency is less
of a concern?

2) I've gotten some basic encoder-based frequency-based analog input
working in other scenarios (
http://code.google.com/p/sector67-sandbox/wiki/FrequencyBasedAnalogInput)
and plan to use that for the analog temperature inputs on the parallel port
if feasible.  Does that seem reasonable?

3) Has anyone else done anything similar to this?  I've followed the
http://reprap.org/wiki/EMCRepRap effort, but that doesn't use the RAMPS
board.  I expect the user interface and gcode translation tools from that
project to be quite useful.

Thanks,

Scott
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Re: [Emc-users] LiveCD Fails to install LinuxCNC

[andy pugh]

On 14 June 2012 00:45, andy pugh  wrote:

> the LiveCD chooses a "better" kernel for you.

I should point out that I am owed no credit for spotting this, I am
just reporting it. It was, not unexpectedly, Jepler who worked it out.

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Re: [Emc-users] ball screw for mini-lathe x drive

[gene heskett]

On Wednesday, June 13, 2012 07:24:53 PM Przemek Klosowski did opine:

> On Wed, Jun 13, 2012 at 10:39 AM, gene heskett  wrote:
> > Nook has an 8x2.5 screw & a 'keyed' ball nut
> 
> They have a nice selection and pretty informative website, but no
> prices. You need to 'get a quote' so I called and talked to a rep, and
> felt that they are not a small/hobbyist customer oriented. The guy was
> nice but it was clear that they don't care for the low cost/entry
> level market.
> 
I got that impression very clearly several years ago when I bought a length 
of 1/2x10 Acme bolt, and 2 bronze nuts.  They were damned proud of those 
nuts too, just under $40 each in bronze.  Shipped the screw in a round 
cardboard tube that wasn't much stronger than newsprint, so of course the 
screw was bent about 1/2" in the middle by the time it got to WV.  I 
straightened something less than half of it for my first pass at a Z drive 
but found that with the screw in the OEM position behind the post, that no 
amount of torque on the screw would put more than 5 lbs of downforce on a 
drill bit, even more worthless than those famous tits on a boar hog.

So I turned the head housing 90 degrees on the spindle sleeve, making room 
for the screw to come down the front of the post about 2" away from it, 
sank it into the top of the sled casting with a nut on the inside, then 
moved the nuts to a sleeve with a ball thrust bearing top & bottom, put a 
toothed belt pulley between them, and the bronze nuts threaded into the 
sleeve above & below the bearings and the motor on a plate off the bottom 
of the top bearing block.  The same motor that was slipping cogs at 5 lbs 
on a bathroom scale now puts 155 lbs on the bathroom scale.  All in the 
geometry.

> I did find some interesting things: he confirmed what we knew already,
> that the most popular and therefore best value ball screw size is 5/8.
> Another useful information was that there are three manufacturing
> classes, in order of increasing accuracy and price. Standard rolled
> thread is accurate to 0.004in/ft; precision rolled good to 0.001/ft,
> and ground thread better than 0.5mil/ft

+ or - tempco I'd have assume.  :(

How do you find anything on the Roton site?

Cheers Przemek, Gene
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Re: [Emc-users] LiveCD Fails to install LinuxCNC

[Chris Radek]

On Wed, Jun 13, 2012 at 06:37:31AM -0500, John Thornton wrote:

> After installing 
> there was no CNC menu and LinuxCNC was not installed 

I've seen this reported before and always followed by a big chorus
of "works for me!"  I think something really must be going on.

If I had to guess (and I do, as I have no data) I'd suspect that
something different happens when the installer finds an internet
connection vs. when it doesn't.  Perhaps apt is nuking linuxcnc
because a dependency is not met.  You should have a dpkg/apt log
available after the install, and it may contain the smoking gun.

Please let us know what you find.

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Re: [Emc-users] LiveCD Fails to install LinuxCNC

[John Thornton]

OPEN_FILES = ""

was the ini setting

However it worked up to the point that I tried to edit ngc.lang to "fix" 
the highlighting

John

On 6/13/2012 10:42 AM, Michael Haberler wrote:
> Am 13.06.2012 um 13:37 schrieb John Thornton:
>
>
>> or numbered subroutine from the mdi anymore and would give me a "File
>> not open" error when I tried to execute a subroutine so I gave up and
> I remember seeing this when the OPEN_FILES= statement in the ini file didnt 
> point to a valid file.
>
> - Michael
>
>
>
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Re: [Emc-users] LiveCD Fails to install LinuxCNC

[Viesturs Lācis]

2012/6/13 John Thornton :
> I'm just going out to the shop with a new LiveCD burned at 1x

IIRC You have D525. Any particular reason not to boot/instal from usb
drive instead of using more and more cd/dvd matrices? Usb has always
worked like a charm for me with all my D510/D525 installs. But I have
had issues with booting from CD, although the same iso image has been
used for both.

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Re: [Emc-users] ball screw for mini-lathe x drive

[andy pugh]

On 13 June 2012 18:47, Przemek Klosowski  wrote:

> You need to 'get a quote' so I called and talked to a rep, and
> felt that they are not a small/hobbyist customer oriented.

You can buy balls crews from Amazon:
http://www.amazon.com/THK-Steel-Precision-Assembly-BNK-0801/dp/B006P583QW/ref=sr_1_3?ie=UTF8&qid=1339611871&sr=8-3&keywords=8mm+ballscrew
But not cheaply compared with, for example:
http://www.zappautomation.co.uk/r08025rswp0-ballnut-p-142.html?cPath=1_59_66_189

> Another useful information was that there are three manufacturing
> classes, in order of increasing accuracy and price. Standard rolled
> thread is accurate to 0.004in/ft; precision rolled good to 0.001/ft,
> and ground thread better than 0.5mil/ft

And I have argued several times that we are almost always going to be
happy with the inaccurate stuff. Especially over the length of a lathe
cross-slide. (and where you are probably touching off anyway, so only
really care that 50 thou is very nearly exactly 50 thou.


-- 
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If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto

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Re: [Emc-users] ball screw for mini-lathe x drive

[Przemek Klosowski]

On Wed, Jun 13, 2012 at 10:39 AM, gene heskett  wrote:
> Nook has an 8x2.5 screw & a 'keyed' ball nut

They have a nice selection and pretty informative website, but no
prices. You need to 'get a quote' so I called and talked to a rep, and
felt that they are not a small/hobbyist customer oriented. The guy was
nice but it was clear that they don't care for the low cost/entry
level market.

I did find some interesting things: he confirmed what we knew already,
that the most popular and therefore best value ball screw size is 5/8.
Another useful information was that there are three manufacturing
classes, in order of increasing accuracy and price. Standard rolled
thread is accurate to 0.004in/ft; precision rolled good to 0.001/ft,
and ground thread better than 0.5mil/ft

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Re: [Emc-users] quick boot

[Terry Christophersen]

This got me wondering how fast my new 525 and sata HD is .
So I got the stopwatch out:

8 sec to the main screen(about time to turn on the air, check
the oil level and walk around to the front to the front of my machine.

not too shabby, but not near 3 sec.

Terry

 
- Original Message -
From: Eric H. Johnson 
To: 'Enhanced Machine Controller (EMC)' 
Cc: 
Sent: Tuesday, June 12, 2012 12:35 PM
Subject: Re: [Emc-users] quick boot


On 6/12/2012 12:16 PM, Stuart Stevenson wrote:
>> Gentlemen,
>>    What would it take to headless boot LinuxCNC in 3 seconds?
>> thanks
>> Stuart
>>
> This article is almost 4 years old but it's got some good hints about fast
booting. 
> http://lwn.net/Articles/299483/

>It points out a cool tool name BootChart that helps identify the
bottlenecks. http://www.bootchart.org/


I still don't know about getting down to 3 seconds, but in addition to what
that article says, you can also try:

1> Set BIOS to quick boot, bypass POST, etc.
2> In BIOS set boot drive as first device in boot order.
3> Use a SATA SSD.
4> Use as much memory as the mother board will accommodate.
5> Use Xubuntu instead of ubuntu (Use Linuxcnc install script).
6> Play with grub boot parameters (i.e. remove "quiet splash"). 
7> Map log files to null or RAM (see:
http://wiki.linuxcnc.org/cgi-bin/wiki.pl?Install_To_CompactFlash)
8> Uninstall any unnecessary applications.
9> Use "bum" (boot-up manager) to remove unnecessary services. 

Regards,
Eric


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Re: [Emc-users] LiveCD Fails to install LinuxCNC

[Michael Haberler]

Am 13.06.2012 um 13:37 schrieb John Thornton:


> or numbered subroutine from the mdi anymore and would give me a "File 
> not open" error when I tried to execute a subroutine so I gave up and 

I remember seeing this when the OPEN_FILES= statement in the ini file didnt 
point to a valid file.

- Michael



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Re: [Emc-users] ball screw for mini-lathe x drive

[andy pugh]

On 13 June 2012 15:39, gene heskett  wrote:
> I see that Nook has an 8x2.5 screw & a 'keyed' ball nut

> Does any one have any experience with that style & size of screw & nut?

Have a look at post 15 onwards here:
http://www.cnczone.com/forums/mini_lathe/63621-mini_lathe_cross_slide_ballscrew-2.html

That's a description and pictures of how I fitted that size of screw
to my lathe.

The salient points are that the drive is in one place, but the thrust
bearings are moved outboard to be out of the way.
And that it took a bit of surgery.

-- 
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[Emc-users] ball screw for mini-lathe x drive

[gene heskett]

I see that Nook has an 8x2.5 screw & a 'keyed' ball nut that comes in 195mm 
and up lengths.  That nut is 20mm in diameter, which if I can figure how to 
attach it to the bottom of the slide, might be usable.  Backlash rated at 
.045mm. That's .0017", and 5x more accurate that what I have.

Does any one have any experience with that style & size of screw & nut?

Thanks.

Cheers, Gene
-- 
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 soap, ballot, jury, and ammo. Please use in that order."
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when others believe him.
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Re: [Emc-users] LiveCD Fails to install LinuxCNC

[gene heskett]

On Wednesday, June 13, 2012 10:26:21 AM John Thornton did opine:

> Gene,
> 
> The offending file is
> usr/share/gtksourceview-2.0/language-specs/ngc.lang AFAIK if you just
> delete it you will get normal black and white which is less annoying
> than rainbow random colors from the current one. Anyway deleting it
> worked for me.
> 
> http://imagebin.org/216231
> 
Yikes, that's even worse than I recalled.  What ever the author of that was 
smoking, I don't think I want ANY of it.

> The only thing correct is the comments when surrounded by ( )
> 
> John
> 
> On 6/13/2012 8:43 AM, gene heskett wrote:
> > On Wednesday, June 13, 2012 09:40:13 AM andy pugh did opine:
> >> On 13 June 2012 12:37, John Thornton  wrote:
> >>> So while trying to fix the eye killing psychedelic highlighting in
> >>> gedit
> > 
> > I can't see the blues very well on the monitor I use on the lathe, so
> > I've been using vim in straight black and white.  But for GCode, I
> > would also like to use Gedit.  I'll give this one a shot later today.
> > 
> >> No clue on the LiveCD issue, but I found that this highlighting file
> >> was better: http://cnc-club.ru/forum/viewtopic.php?f=33&t=80
> > 
> > Cheers, Gene
> 
> 
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Cheers, Gene
-- 
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 soap, ballot, jury, and ammo. Please use in that order."
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Re: [Emc-users] LiveCD Fails to install LinuxCNC

[John Thornton]

I'm just going out to the shop with a new LiveCD burned at 1x and will 
boot on it then delete the existing partition and format the hard drive 
then try to install

John

On 6/13/2012 8:54 AM, Andy Pugh wrote:
>
> On 13 Jun 2012, at 12:55, John Thornton  wrote:
>
>> what was the result of your tests
>> last night?
> It just worked, no problems and a working LinuxCNC install.
>
> The difference might be that I have always been installing to a new blank 
> drive (real or VM)
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Re: [Emc-users] LiveCD Fails to install LinuxCNC

[John Thornton]

Gene,

The offending file is 
usr/share/gtksourceview-2.0/language-specs/ngc.lang AFAIK if you just 
delete it you will get normal black and white which is less annoying 
than rainbow random colors from the current one. Anyway deleting it 
worked for me.

http://imagebin.org/216231

The only thing correct is the comments when surrounded by ( )

John

On 6/13/2012 8:43 AM, gene heskett wrote:
> On Wednesday, June 13, 2012 09:40:13 AM andy pugh did opine:
>
>> On 13 June 2012 12:37, John Thornton  wrote:
>>> So while trying to fix the eye killing psychedelic highlighting in
>>> gedit
> I can't see the blues very well on the monitor I use on the lathe, so I've
> been using vim in straight black and white.  But for GCode, I would also
> like to use Gedit.  I'll give this one a shot later today.
>
>> No clue on the LiveCD issue, but I found that this highlighting file was
>> better: http://cnc-club.ru/forum/viewtopic.php?f=33&t=80
>
> Cheers, Gene

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Re: [Emc-users] LiveCD Fails to install LinuxCNC

[Andy Pugh]

On 13 Jun 2012, at 12:55, John Thornton  wrote:

> what was the result of your tests 
> last night?

It just worked, no problems and a working LinuxCNC install. 

The difference might be that I have always been installing to a new blank drive 
(real or VM)
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Re: [Emc-users] LiveCD Fails to install LinuxCNC

[gene heskett]

On Wednesday, June 13, 2012 09:40:13 AM andy pugh did opine:

> On 13 June 2012 12:37, John Thornton  wrote:
> > So while trying to fix the eye killing psychedelic highlighting in
> > gedit
> 
I can't see the blues very well on the monitor I use on the lathe, so I've 
been using vim in straight black and white.  But for GCode, I would also 
like to use Gedit.  I'll give this one a shot later today.

> No clue on the LiveCD issue, but I found that this highlighting file was
> better: http://cnc-club.ru/forum/viewtopic.php?f=33&t=80


Cheers, Gene
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Re: [Emc-users] LiveCD Fails to install LinuxCNC

[John Thornton]

I just tried to install the LiveCD again after last night leaving me at 
the maroon screen of death and the only thing that got installed from 
LinuxCNC was the docs in english and truetypetracer...

John

On 6/13/2012 6:44 AM, andy pugh wrote:
> On 13 June 2012 12:37, John Thornton  wrote:
>> So while trying to fix the eye killing psychedelic highlighting in gedit
> No clue on the LiveCD issue, but I found that this highlighting file was 
> better:
> http://cnc-club.ru/forum/viewtopic.php?f=33&t=80
>

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Re: [Emc-users] LiveCD Fails to install LinuxCNC

[John Thornton]

Andy,

Thanks for the link, I can't wait to try Nick's highlighting out as soon 
as I can get LinuxCNC to install... what was the result of your tests 
last night? I know Tom_itx had the same problem that I did and gave up 
and used the install script.

John

On 6/13/2012 6:44 AM, andy pugh wrote:
> On 13 June 2012 12:37, John Thornton  wrote:
>> So while trying to fix the eye killing psychedelic highlighting in gedit
> No clue on the LiveCD issue, but I found that this highlighting file was 
> better:
> http://cnc-club.ru/forum/viewtopic.php?f=33&t=80
>

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Re: [Emc-users] LiveCD Fails to install LinuxCNC

[andy pugh]

On 13 June 2012 12:37, John Thornton  wrote:
> So while trying to fix the eye killing psychedelic highlighting in gedit

No clue on the LiveCD issue, but I found that this highlighting file was better:
http://cnc-club.ru/forum/viewtopic.php?f=33&t=80

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[Emc-users] LiveCD Fails to install LinuxCNC

[John Thornton]

So while trying to fix the eye killing psychedelic highlighting in gedit 
for a ngc file I somehow broke LinuxCNC and it would not execute a named 
or numbered subroutine from the mdi anymore and would give me a "File 
not open" error when I tried to execute a subroutine so I gave up and 
grabbed what I thought was the last LiveCD that I had burned and iirc 
the one that I used on the BP to install LinuxCNC. After installing 
there was no CNC menu and LinuxCNC was not installed so I assumed I had 
the wrong disk and went and found another disk and got the same result. 
One of the two was ubuntu only for sure... so I said screw this and I'll 
just download the LiveCD again and burn a new disk on my winblows 
desktop. Next install still no CNC. So I downloaded it again on the 
ubuntu machine and burned another LiveCD. When I selected just try it or 
what ever it is the CNC menu showed up so I assumed all was well so I 
installed it and bam no LinuxCNC.

MB 525, was running 2.5 from buildbot...

Any clues?

John

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