Re: [Emc-users] Encoders x 2

2011-02-17 Thread jros

Kim,

On Wed, 2011-02-16 at 17:03 -0600, Kim Kirwan wrote:
 Yes, this can be done and Stuart (for one) has done it. 
 
 See the wiki Combining Two Feedback Devices On One Axis
 http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?Combining_Two_Feedback_Devices_On_One_Axis
 

Certainly that looks like a possibility but, I think that the state of
the art approach would be a Kalman filter, that can be used to get the
best from both sensors and give back a more precise feedback. In
addition to this, if a decent model of the machine is available, kalman
filter would use it additionally to get an even improved feedback
(including velocity and acceleration if needed).

Cheers,

Javier

 Thanks, 
 
 Kim
 
 
 On 02/16/2011 03:21 PM, Marshland Engineering wrote:
  I'm not sure if this can be done but I do have it on my existing mill.
  
  It has servo drives with encoders but it also has encoders on the table. 
  This obviously gets rid of backlash. (I have to say it is very accurate 
  mill)
  
  Has anyone done something like this ?
  
  Thanks Wallace
  
  
  
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Re: [Emc-users] Map Network drive

2011-02-17 Thread Mark Wendt
On 02/16/2011 05:42 PM, Doug wrote:
 What is the best way to have emc find files on a local network server?   It
 seems only local folders show up in the drop down box.   I have mounted on
 the desktop a linked drive to find but have to do that every time the
 machine starts.   I would like not to have to do this.

 Doug

Doug,

Is this a Windows, or a Unix NFS network share?

Mark

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Re: [Emc-users] Turning spindle off

2011-02-17 Thread John Thornton
That is the way my BP Discovery works. You press the Oh Shit button and 
all motion stops but the spindle keeps turning and coolant keep flowing. 
You press the spindle up button and the spindle moves to the clear 
position. Then you can press the spindle stop button and the spindle and 
coolant stop...

Seems logical (to this hillneck) that kind of thing should be 
configurable by the integrator to some degree.

John the top poster

Farzin Kamangar wrote:
 Dear EMC users,
   I was asked to make the following change in the controller behaviour.
 As you know when we want to stop the running program and we push the stop
 program button, program stops and
 so does spindle from turning. Now the request is: when we stop the program
 by pressing the stop program button, we want the spindle to keep on turning
 if it was turning before pressing the
 stop program button. What do you think? This is because they do not want the
 tool in spindle to get stuck in the workpiece when we stop the program. We
 stop spindle by pressing spindle
 off button or by entering M5 in MDI later. Thanks
 Farzin
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Re: [Emc-users] Turning spindle off (or not)

2011-02-17 Thread kilian


  Original Message 
 Subject: [Emc-users] Turning spindle off
 From: Farzin Kamangar farzin.kaman...@gmail.com
 Date: Thu, February 17, 2011 12:05 am
 To: Enhanced Machine Controller (EMC)
 emc-users@lists.sourceforge.net
 
 
 Dear EMC users,
  I was asked to make the following change in the controller behaviour.
 As you know when we want to stop the running program and we push the stop
 program button, program stops and
 so does spindle from turning. Now the request is: when we stop the program
 by pressing the stop program button, we want the spindle to keep on turning
 if it was turning before pressing the
 stop program button. What do you think? This is because they do not want the
 tool in spindle to get stuck in the workpiece when we stop the program. We
 stop spindle by pressing spindle
 off button or by entering M5 in MDI later. Thanks
 Farzin

I have a similar issue I'd like to change.

I have a sticky spindle motor on a dental mill, 
and sometimes it doesn't want to start. So I start
it using the spindle on/off toggle, and after it's 
running, I start milling.

But when I start milling, the spindle is commanded off, 
and immediately right back on. Most of the time the spindle 
starts running again.

I'm going to see if I can change it so that the spindle
is not stopped when starting a milling operation.
(But that makes it real interesting when the tool-change
notice box comes up and asks you to insert tool #1!)

This isn't something that would be useful in the regular 
release, but it'll be fun seeing if I can make it work.

  -Alan



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Re: [Emc-users] Map Network drive

2011-02-17 Thread Doug
Sorry this is a windows server.

Arch Fitters
Doug McCurtain (C.Ped)
President

-Original Message-
From: Mark Wendt [mailto:mark.we...@nrl.navy.mil] 
Sent: Thursday, February 17, 2011 2:44 AM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] Map Network drive

On 02/16/2011 05:42 PM, Doug wrote:
 What is the best way to have emc find files on a local network server?
It
 seems only local folders show up in the drop down box.   I have mounted on
 the desktop a linked drive to find but have to do that every time the
 machine starts.   I would like not to have to do this.

 Doug

Doug,

Is this a Windows, or a Unix NFS network share?

Mark


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Re: [Emc-users] Map Network drive

2011-02-17 Thread Stuart Stevenson
I have smb installed on my emc2 machines and the nc_files directory shared.
This way the files reside on my machine's hard drive so the condition of the
network does not affect the file information during a run.
The windows machines on the network are smb connected to the directory on
the machine's hard drive. They seem to maintain and reconnect on restart
without any problems.
The linux machines on the network also connect to the directories using smb.

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Re: [Emc-users] Charge pump

2011-02-17 Thread Doug
I have a new PMDX Gecko driver board.  It requires an osculating +5 to 0 to
enable the outputs.   I am using the step wizard and find that I only get a
solid voltage out of pin 17 when I choose charge pump in the wizard.  How
can I fix this?   PMDX manufacture does not have a sample config file.  As
you can tell I am using the wizard so you assume correct that I am new to
EMC but learning fast.  Please respond with idiot proof instructions.  I
need a EMC for dummies book.

PS. I am looking for a EMC tech in my area.  If I spent a few days with
someone that has experience I could learn a lot faster.  I live in Gresham
Oregon.  There has to be some experts in Portland area.  I am will pay for
there time, we are building CNC machines from the ground up.  Exciting but
frustrating at the same time.  

Doug McCurtain


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Re: [Emc-users] Turning spindle off

2011-02-17 Thread gene heskett
On Thursday, February 17, 2011 10:07:11 am Farzin Kamangar did opine:

 Dear EMC users,
  I was asked to make the following change in the controller
 behaviour. As you know when we want to stop the running program and we
 push the stop program button, program stops and
 so does spindle from turning. Now the request is: when we stop the
 program by pressing the stop program button, we want the spindle to
 keep on turning if it was turning before pressing the
 stop program button. What do you think? This is because they do not want
 the tool in spindle to get stuck in the workpiece when we stop the
 program. We stop spindle by pressing spindle
 off button or by entering M5 in MDI later. Thanks
 Farzin

I think that will depend on how you are currently controlling the spindle.  
In my own case I built my interface for that using a PMDX-106, which uses a 
PWM signal from EMC to enable the spindle speed control in addition to a 
rev signal that I use to bang the DPDT relays, all of which goes to manual 
control at the flip of a center off switch on the PMDX-106.  But there is 
no way to leave the spindle running except by using the manual controls on 
the PMDX-106 as the PWM heartbeat from EMC stops when the esc/stop button 
is pressed.

I personally have not had the bit get stuck as it will turn and cut itself 
free for a turn or 2 after my steppers have frozen in place even though I 
do have a 'suicide' brake setup that stops the motor in 2 or 3 revolutions.  
Unforch, I can't say the same if the spindle is overloaded and trips its 
shutdown, there I have broken a 1/4 solid carbide mill once, and smaller 
mills are instantly shattered should they plug up while plowing in soft 
alu.

I found that I generally make more use of the manual mode that I do of the 
EMC controlled mode because that lets me adjust the spindle rpms directly, 
for me much handier and more instinctive than the mouse based controls AXIS 
gives.

I'm afraid that we do not have enough info to offer any meaningful advice.  
We would need to know what your current control method is before a suitable 
plan might be offered by one of the smarter people here.  If indeed one, 
other than full manual can be suggested.

-- 
Cheers, Gene
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 soap, ballot, jury, and ammo. Please use in that order.
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Re: [Emc-users] Charge pump

2011-02-17 Thread andy pugh
On 17 February 2011 17:26, Doug d...@archfitters.com wrote:
 I have a new PMDX Gecko driver board.  It requires an osculating +5 to 0 to
 enable the outputs.

I learned many years ago that osculating 5V hurts. :-)

   I am using the step wizard and find that I only get a
 solid voltage out of pin 17 when I choose charge pump in the wizard.

Have a look in the HAL file to see what stepconf has created,
You ought to see the charge pump be loaded (loadrt charge_pump), added
to a realtime thread (addf charge-pump base-thread) and then linked to
the parport pin (net pin-name charge-pump.out parport.0.pin-17-out )
It is possible that the net command might be split onto two lines in
different parts of the file.

-- 
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Re: [Emc-users] Charge pump

2011-02-17 Thread Kirk Wallace
On Thu, 2011-02-17 at 07:26 -0800, Doug wrote:
 I have a new PMDX Gecko driver board.  It requires an osculating +5 to 0 to
 enable the outputs.   I am using the step wizard and find that I only get a
 solid voltage out of pin 17 when I choose charge pump in the wizard.  How
 can I fix this?   PMDX manufacture does not have a sample config file.

There might be something useful here:
http://wiki.linuxcnc.org/emcinfo.pl?About_Charge_Pumps 

Basically, check to see if the charge pump component is loaded with
loadrt, invoked by addf, and connected with net in your .hal file.
-- 
Kirk Wallace
http://www.wallacecompany.com/machine_shop/
http://www.wallacecompany.com/E45/index.html
California, USA


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Re: [Emc-users] Encoders with no Index

2011-02-17 Thread Jon Elson
Igor Chudov wrote:
 
 Which brings up a question, can one tap with a plug tap first, on a CNC mill
 that is equipped for rigid tapping?
   
The problem is how do you synchronize two taps, in different holders, so 
that the threads are synched?
I really don't think rigid tapping with a roughing and a finish tap is 
practical.  Probably the only way to
do it would be to rigid tap with the plug tap, change to the finish tap 
but leave the holder loose and manually
start it into the hole, and let the existing threads synch the tap.  
Then, tighten the tap holder while it is still
in the hole.  This is not what I'd call a reasonable shop operation.

Jon

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Re: [Emc-users] Encoders with no Index

2011-02-17 Thread Jon Elson
Igor Chudov wrote:
 Stuart, what I mean is this:

 1) Drill a hole for tapping
 2) Tap with a plug tap

 Is that possible with a CNC mill equipped for rigid tapping? (like mine)?
   
It depends on the hole size, the thread engagement, the material, the 
thickness of the material, etc.
I am sure you could do this in thin aluminum with an adequate hole 
diameter.  I am sure you will
have an accident attempting to do the same in thick stainless.  I have a 
lot of experience now
rigid tapping in various aluminum parts, but all with smaller taps from 
2-56 up to 10-32.  it was really
COOL to watch it tap fairly deep holes with a 2-56 tap!  All I had to do 
was brush the chips out of
the tap's flutes every hole with a toothbrush soaked with alum-tap, and 
it went beautifully.

But, proper tap selection really makes all the difference.  Try to do 
too deep a hole with spiral flute
taps and they choke on their own chip and break.  So, I have a selection 
of combined drill-taps (thin material only, no more than 2X major 
diameter), spiral flute (maybe 3-4 X diameter) and spiral point for 
anything deeper.

Jon

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Re: [Emc-users] Encoders with no Index

2011-02-17 Thread andy pugh
On 17 February 2011 19:19, Jon Elson el...@pico-systems.com wrote:

 Probably the only way to
 do it would be to rigid tap with the plug tap, change to the finish tap
 but leave the holder loose and manually
 start it into the hole, and let the existing threads synch the tap.
 Then, tighten the tap holder while it is still
 in the hole.  This is not what I'd call a reasonable shop operation.

Once set up though, with indexed holders (such as BT, CAT, INT) it
should carry on working.

However, this all seems a bit of a diversion from the original question...

-- 
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Re: [Emc-users] Turning spindle off (or not)

2011-02-17 Thread Jon Elson
kil...@bobodyne.com wrote:
   
 Dear EMC users,
  I was asked to make the following change in the controller behaviour.
 As you know when we want to stop the running program and we push the stop
 program button, program stops and
 so does spindle from turning. Now the request is: when we stop the program
 by pressing the stop program button, we want the spindle to keep on turning
 if it was turning before pressing the
 stop program button. What do you think? This is because they do not want the
 tool in spindle to get stuck in the workpiece when we stop the program. We
 stop spindle by pressing spindle
 off button or by entering M5 in MDI later. Thanks
 
There is an option which allows you to manually start the spindle (in 
MDI) before switching modes
to manual, so that you can have the spindle running when you run from 
line.  I went looking for this
in my configs files and can't find it.  It may not be a setting in the 
.ini file, but something that is
set when compiling EMC.  Sorry my memory is so vague.  I think this 
setting will at least partially
help Farzin, too.

Jon

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[Emc-users] Joypad button to tell axis to move?

2011-02-17 Thread Igor Chudov
I have a Saitek P880 joypad. It works REALLY great to do the following:

1) Control X, Y and Z with joyhandles (little levers sticking out of the
joypad)
2) Make some buttons like input.0.btn-pinkie to control HAL pins to give HAL
pause and resume commands.

The nice thing is that depending on how much I deflect joyhandles, the speed
of movement is selected accordingly.

Unfortunately, I used both joyhandles and have no more of them available.

For two more axis, I would like to use regular joypad buttons (not
joyhandles) to tell the axis to move forward or back with predetermined
speed.

kind of like (incorrect)

net moveAAxisLeft input.0.btn-top2 = halui.move-axis-A-left

In other words: when I press a certain button, I want a given axis to start
moving in a given direction at a predetermined speed. When I release that
button, I want movement to stop.

How can I set that up.

thanks
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[Emc-users] Machine tapping was Encoders with no Index

2011-02-17 Thread dave
On Thu, 2011-02-17 at 19:35 +0200, andy pugh wrote:
 On 17 February 2011 19:19, Jon Elson el...@pico-systems.com wrote:
 
  Probably the only way to
  do it would be to rigid tap with the plug tap, change to the finish tap
  but leave the holder loose and manually
  start it into the hole, and let the existing threads synch the tap.
  Then, tighten the tap holder while it is still
  in the hole.  This is not what I'd call a reasonable shop operation.
 
 Once set up though, with indexed holders (such as BT, CAT, INT) it
 should carry on working.
 
 However, this all seems a bit of a diversion from the original question...
 

Since this thread has bird-walked from spindle orient to tapping I
thought I would take the liberty of renaming. 

In all this fuss over how to machine tap no one has mentioned thread
forming. The few times I've tried it by hand it has worked well. 

With small holes reaming to the starting size is recommended. 

It works well with CD 1020 which is not completely soft. tensile of
about 70K. Tapping 304 SS might be a challenge but I've not tried it. 

I know of an emc-er that tapped some 800+ holes in A36 with a single
tap. :-)  All done with a portable drill. ;-)

No swarf to worry about in the final op. just drill, ream to size and
tap, reverse out and be done.  Yes I know that involves an extra op but
you get good threads right down to as close to the bottom as your guts
will let you go. 

Obviously, there are limits to where this is practical but the method
seems to be under-utilized. 

Just my tuppence. 

Dave


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Re: [Emc-users] Joypad button to tell axis to move?

2011-02-17 Thread andy pugh
On 17 February 2011 21:39, Igor Chudov ichu...@gmail.com wrote:

 In other words: when I press a certain button, I want a given axis to start
 moving in a given direction at a predetermined speed. When I release that
 button, I want movement to stop.

 How can I set that up.

Look at the mux4 component. define states 00 and 11 to be 0 output, 01
to be +speed and 10 to be -speed. Then link the buttons to the sel0
and sel1 pins: http://www.linuxcnc.org/docview/html/man/man9/mux4.9.html

-- 
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Re: [Emc-users] Joypad button to tell axis to move?

2011-02-17 Thread Ed Nisley
On Thu, 2011-02-17 at 13:39 -0600, Igor Chudov wrote:
 I would like to use regular joypad buttons

I did that with my Logitech gamepad: the joysticks do gradual motion and
the buttons do on-off motion.

This should get you started:

http://softsolder.com/2010/10/23/logitech-gamepad-as-emc2-pendant-eagle-schematics-for-the-joggy-thing/

I wrote up a somewhat more elaborate version  for Digital Machinist
magazine. You can fetch the files (but not the article itself) from:

http://www.digitalmachinist.net/files/downloads/2010Winter/DM%205.4%
20Nisley.zip

There's a bit of trickery in that version to avoid some race conditions,
but the overall logic is straightforward.

As soon as I got it set up, there was no going back!

-- 
Ed
http://softsolder.com



--
The ultimate all-in-one performance toolkit: Intel(R) Parallel Studio XE:
Pinpoint memory and threading errors before they happen.
Find and fix more than 250 security defects in the development cycle.
Locate bottlenecks in serial and parallel code that limit performance.
http://p.sf.net/sfu/intel-dev2devfeb
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Re: [Emc-users] Machine tapping was Encoders with no Index

2011-02-17 Thread Przemek Klosowski
On Thu, Feb 17, 2011 at 4:43 PM, dave dengv...@charter.net wrote:


 In all this fuss over how to machine tap no one has mentioned thread
 forming. The few times I've tried it by hand it has worked well.

 True, but one has to be very careful with threadforming if thread strength
is important:


http://machinedesign.com/article/internal-thread-strip-out-tests-yield-surprising-results-0113?page=0%2C0

shows that thread strength is critically dependent on hole diameter when
threadforming, much more so than for regular threading
--
The ultimate all-in-one performance toolkit: Intel(R) Parallel Studio XE:
Pinpoint memory and threading errors before they happen.
Find and fix more than 250 security defects in the development cycle.
Locate bottlenecks in serial and parallel code that limit performance.
http://p.sf.net/sfu/intel-dev2devfeb
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