[Emc-users] Gscreen - Origin functions

2014-06-12 Thread Marius Liebenberg
Can someone please explain to me how the Zero Origin and Offset 
Origin in Gscreen works? Or how it is intended to work at least.

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+27 12 743 6064
QQ 1767394877


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Re: [Emc-users] Ball Screw Drive?

2014-06-12 Thread Viesturs Lācis
2014-06-12 3:34 GMT+03:00 Todd  Zuercher
zuerc...@embarqmail.com:
 The machine is one that has had a problematic (under engineered drive train) 
 from the get-go.  It is an 8 spindle gang router for wood carving, with a 
 12ft long gantry that has about 5ft of travel (Y-axis).

Could you please explain your reason, _why_ you do want to drive both
ends of gantry with one motor? I have built several gantry machines,
motor on each end, 2 of them are running with servo motors.

Viesturs

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Re: [Emc-users] New trajectory planner merged into LinuxCNC's development branch

2014-06-12 Thread Steve Blackmore
On Wed, 11 Jun 2014 19:29:27 -0600, you wrote:

I'm pleased to announce that Robert Ellenberg's new trajectory planner
has been merged into LinuxCNC.  It is in the master branch, aka 2.7~pre,
what will become 2.7 later when it's released.  It will be part of build
v2.7.0-pre0-550-gd699a06 and later.  The new TP is not in 2.5 or 2.6,
those will keep working the same way they always have.

Has the arc to line, line to arc transition problem been fixed? 

If so, why the delay to 2.7 and not put it in 2.6? 

Steve Blackmore
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Re: [Emc-users] Ball Screw Drive?

2014-06-12 Thread yann jautard

Le 11/06/2014 20:28, noel a écrit :
 Timing belt.  Lots of ways to use 'em.  2 from 1 motor, or 1 continuous.
 Very reliable.  Very robust.  Size them properly and keep them tensioned and
 they are wonderful.

 NR


Yes, I agree. Done that this way on my 2mx1,5m gantry, works very well.

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[Emc-users] Mesa 5I25 Stepping when linuxcnc is not running

2014-06-12 Thread Rene Hopf
Hi,
Today I converted a mill form parport to 5I25, using 5i25_r990x2.bit bitfile.
Everything was running good. Having a mesa card, I wanter to increase the speed.
When I closed linuxcnc, X and Y ran into the endstops at full speed.
Thinking of watchdog problems, I removed the pet function from the servo thread.
The hal pin indicates the watchdog has bitten, and I get no steps.
But when I exit linuxcnc I get steps in X and Y.
Rebooting shows that the steps are generated as soon as I press the power 
button, and do not stop until I start Linuxcnc.
I already tried reflashing the bitfile.

As far as I can see the watchdog should bite when linuxcnc is not running, 
switching outputs to high impedance.
The drives are connected via 330R and an 6N137. 
http://www.uhu-servo.de/UHU_PCB_3_13.pdf
There is no way they can move on high impedance input.
They stop moving when I pull the cable from the mesa card.
The same setup rund without problems using the parport, apart from a few steps 
generated during bootup.

I have another mill with a similar setup, but with a chargepump.
A chargepump will fix this, but anyway, the mesa card must not output steps 
when Linuxcnc is not running…

Rene
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Re: [Emc-users] New trajectory planner merged into LinuxCNC's development branch

2014-06-12 Thread sam sokolik
The new TP behavior is on by default in master.  If you have no TP 
settings in your [TRAJ] section - linuxcnc defaults to.

ARC_BLEND_ENABLE = 1
ARC_BLEND_FALLBACK_ENABLE = 0
ARC_BLEND_OPTIMIZATION_DEPTH = 50
ARC_BLEND_GAP_CYCLES = 4
ARC_BLEND_RAMP_FREQ = 100

I have cut and pasted some info from Robs post on the forum - helps 
explain each setting


-ARC_BLEND_ENABLE = 1

Turn on new TP. If set to 0 TP uses parabolic blending (1 segment look 
ahead.) Default value 1.

-ARC_BLEND_FALLBACK_ENABLE = 0

Optionally fall back to parabolic blends if the estimated speed is 
faster. However, this estimate is rough, and it seems that just 
disabling it gives better performance. Default value 0.

-ARC_BLEND_OPTIMIZATION_DEPTH = 50

Lookahead depth in number of segments.

To expand on this a bit, you can choose this value somewhat arbitrarily. 
Here's a formula to estimate how much depth you need for a particular 
config:

# n = v_max / (2.0 * a_max * t_c)
# where:
# n = optimization depth
# v_max = max axis velocity (UU / sec)
# a_max = max axis acceleration (UU / sec)
# t_c = servo period (seconds)

So, a machine with a maximum axis velocity of 10 IPS, a max acceleration 
of 100 IPS^2, and a servo period of 0.001 sec would need:

10 / (2.0 * 100 * 0.001) = 50 segments to always reach maximum velocity 
along the fastest axis.

In practice, this number isn't that important to tune, since the 
lookahead rarely needs the full depth unless you have lots of very short 
segments. If during testing, you notice strange slowdowns and can't 
figure out where they come from, first try increasing this depth using 
the formula above.

If you still see strange slowdowns, it may be because you have short 
segments in the program. If this is the case, try adding a small 
tolerance for Naive CAM detection. A good rule of thumb is this:

# min_length ~= v_req * t_c
# where:
# v_req = desired velocity in UU / sec
# t_c = servo period (seconds)

If you want to travel along a path at 1 IPS = 60 IPM, and your servo 
period is 0.001 sec, then any segments shorter than min_length will slow 
the path down. If you set Naive CAM tolerance to around this min length, 
overly short segments will be combined together to eliminate this 
bottleneck. Of course, setting the tolerance too high means big path 
deviations, so you have to play with it a bit to find a good value. I'd 
start at 1/2 of the min_length, then work up as needed.

-ARC_BLEND_GAP_CYCLES = 4

How short the previous segment must be before the trajectory planner 
consumes it

Often, a circular arc blend will leave short line segments in between 
the blends. Since the geometry has to be circular, we can't blend over 
all of a line if the next one is a little shorter. Since the trajectory 
planner has to touch each segment at least once, it means that very tiny 
segments will slow things down significantly. My fix to this way to 
consume the short segment by making it a part of the blend arc. Since 
the line+blend is one segment, we don't have to slow down to hit the 
very short segment. Likely, you won't need to touch this setting.

-ARC_BLEND_RAMP_FREQ = 20

This is a cutoff frequency for using ramped velocity

Ramped velocity in this case just means constant acceleration over the 
whole segment. This is less optimal than a trapezoidal velocity profile, 
since the acceleration is not maximized. However, if the segment is 
short enough, there isn't enough time to accelerate much before we hit 
the next segment. Recall the short line segments from the previous 
example. Since they're lines, there's no cornering acceleration, so 
we're free to accelerate up to the requested speed. However, if this 
line is between two arcs, then it will have to quickly decelerate again 
to be within the maximum speed of the next segment. This means that we 
have a spike of acceleration, then a spike of deceleration, causing a 
large jerk, for very little performance gain. This setting is a way to 
eliminate this jerk for short segments.

Basically, if a segment will complete in less time than 1 / 
ARC_BLEND_RAMP_FREQ, we don't bother with a trapezoidal velocity profile 
on that segment, and use constant acceleration. (Setting 
ARC_BLEND_RAMP_FREQ = 1000 is equivalent to always using trapezoidal 
acceleration, if the servo loop is 1kHz). I had considered making the 
RAMP_FREQ into a time instead, but it seems like the idea of a cutoff 
frequency is more intuitive, at least to a controls engineer.

expanding further

You can characterize the worst-case loss of performance by comparing the 
velocity that a trapezoidal profile reaches vs. the ramp:

# v_ripple = a_max / (4.0 * f)
# where:
# v_ripple = average velocity loss due to ramping
# a_max = max axis acceleration
# f = cutoff frequency from INI

For the aforementioned machine, the ripple for a 20Hz cutoff frequency 
is 100 / (4 * 20) = 1.25 IPS. This seems high, but keep in mind that it 
is only a worst-case estimate. In reality , the 

Re: [Emc-users] New trajectory planner merged into LinuxCNC's development branch

2014-06-12 Thread sam sokolik
Hi Steve

Do you remember this program?
http://electronicsam.com/images/KandT/testing/steve.ngc
http://electronicsam.com/images/KandT/testing/Screenshot%20from%202014-06-12%2006:54:36.png

This was a snippet of code that you had posted a while back.
This is a velocity plot with the old TP
http://electronicsam.com/images/KandT/testing/Screenshot%20from%202014-06-12%2006:56:26.png

New TP
http://electronicsam.com/images/KandT/testing/Screenshot%20from%202014-06-12%2006:54:17.png

It gets up to the programmed feed and stays there.

sam


On 6/12/2014 2:28 AM, Steve Blackmore wrote:
 On Wed, 11 Jun 2014 19:29:27 -0600, you wrote:

 I'm pleased to announce that Robert Ellenberg's new trajectory planner
 has been merged into LinuxCNC.  It is in the master branch, aka 2.7~pre,
 what will become 2.7 later when it's released.  It will be part of build
 v2.7.0-pre0-550-gd699a06 and later.  The new TP is not in 2.5 or 2.6,
 those will keep working the same way they always have.
 Has the arc to line, line to arc transition problem been fixed?

 If so, why the delay to 2.7 and not put it in 2.6?

 Steve Blackmore
 --

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Re: [Emc-users] Mesa 5I25 Stepping when linuxcnc is not running

2014-06-12 Thread Peter C. Wallace

On Thu, 12 Jun 2014, Rene Hopf wrote:


Date: Thu, 12 Jun 2014 12:31:22 +0200
From: Rene Hopf reneh...@mac.com
Reply-To: Enhanced Machine Controller (EMC)
emc-users@lists.sourceforge.net
To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net
Subject: [Emc-users] Mesa 5I25 Stepping when linuxcnc is not running

Hi,
Today I converted a mill form parport to 5I25, using 5i25_r990x2.bit bitfile.
Everything was running good. Having a mesa card, I wanter to increase the speed.
When I closed linuxcnc, X and Y ran into the endstops at full speed.
Thinking of watchdog problems, I removed the pet function from the servo thread.
The hal pin indicates the watchdog has bitten, and I get no steps.
But when I exit linuxcnc I get steps in X and Y.
Rebooting shows that the steps are generated as soon as I press the power 
button, and do not stop until I start Linuxcnc.
I already tried reflashing the bitfile.

As far as I can see the watchdog should bite when linuxcnc is not running, 
switching outputs to high impedance.
The drives are connected via 330R and an 6N137. 
http://www.uhu-servo.de/UHU_PCB_3_13.pdf
There is no way they can move on high impedance input.
They stop moving when I pull the cable from the mesa card.
The same setup rund without problems using the parport, apart from a few steps 
generated during bootup.

I have another mill with a similar setup, but with a chargepump.
A chargepump will fix this, but anyway, the mesa card must not output steps 
when Linuxcnc is not running…

Rene



The 5I25 will _not_ output steps when linuxcnc does not command them.
I suspect you have an interface problem of some kind. This will probably have 
to be resolved with a voltmeter or scope.




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Peter Wallace
Mesa Electronics

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Re: [Emc-users] Ball Screw Drive?

2014-06-12 Thread Todd Zuercher
I don't really have a good reason, more exploring options and thinking out 
loud, not really wanting to fight with the problems with gantries in LinuxCNC, 
the machines only has 3 motors and drives, now and these model drives, and 
motors and drives are discontinued so getting a matching one may be impossible 
(I know I could swap the Z or X to the 2nd Y).  It looks like the mechanical 
drawbacks of trying to use 1 motor may be outweighing the configuration issues 
in Linuxcnc.  

I am still in the stage of working out plans and strategies to propose to my 
superiors.  You know they type, Why do you want to spend a bunch of money 
upgrading the machine, its been running that way for the past 10 years, yeah 
and I am continually receiving complaints about the carving quality, asking me 
if there is anything I can do to improve it.

- Original Message -
From: Viesturs Lācis viesturs.la...@gmail.com
To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net
Sent: Thursday, June 12, 2014 2:38:31 AM
Subject: Re: [Emc-users] Ball Screw Drive?

2014-06-12 3:34 GMT+03:00 Todd  Zuercher
zuerc...@embarqmail.com:
 The machine is one that has had a problematic (under engineered drive train) 
 from the get-go.  It is an 8 spindle gang router for wood carving, with a 
 12ft long gantry that has about 5ft of travel (Y-axis).

Could you please explain your reason, _why_ you do want to drive both
ends of gantry with one motor? I have built several gantry machines,
motor on each end, 2 of them are running with servo motors.

Viesturs

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Re: [Emc-users] New trajectory planner merged into LinuxCNC's development branch

2014-06-12 Thread Sebastian Kuzminsky
On 6/12/14 06:15 , sam sokolik wrote:
 http://electronicsam.com/images/KandT/testing/steve.ngc
...

 New TP
 http://electronicsam.com/images/KandT/testing/Screenshot%20from%202014-06-12%2006:54:17.png

 It gets up to the programmed feed and stays there.

That's a really striking demonstration, Sam!


 On 6/12/2014 2:28 AM, Steve Blackmore wrote:
 If so, why the delay to 2.7 and not put it in 2.6?

It's not in 2.6 because 2.6 is too close to release to introduce such 
deep changes.


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Re: [Emc-users] New trajectory planner merged into LinuxCNC's development branch

2014-06-12 Thread Gene Heskett
On Thursday 12 June 2014 10:53:05 Pete Matos did opine
And Gene did reply:
 I was under the impression that this was in the latest master release a
 bit ago.  I thought you had to enable something to make it work. There
 were some  folks testing it tho.  I really would like to get this on
 my machine soon.  I still have some work to do to my Cincinatti Arrow
 500 VMC retrofit but it is getting there.  The machine works really
 well now and the parts I am  making are coming out excellent thanks in
 large part to LinuxCNC.  Here is a photo of my latest creations on a
 custom precision air rifle. I am kinda proud of them so if you have
 seen them before please forgive the unabashed showing off LOL.. peace
 
 Pete

Wow Pete, thats one sweet looking paper punch.  I'd be proud to drag that 
out at the range. I'll bet it gets the oooh's and aah's when you do too.

I've got a BP 50 cal that gets comments (but not from the purists, they 
don't like thumb hole stocks) but they quit bitching when they look at the 
size of the group it just shot.

That is very nice, beats anything I've done for sure.

Cheers, Gene Heskett
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Re: [Emc-users] New trajectory planner merged into LinuxCNC's development branch

2014-06-12 Thread Pete Matos
Gene,
 Thanks man but UNFORTUNATELY it is not mine LOL.  I just machined the
custom scope riser and the removable custom side focus wheel for it. I am
also probably going to be making some range markers for the scope as well
here soon.  The rifle is a stunner for sure and one of the meanest looking
airguns I have ever seen. It is pretty much STUPID expensive LOL.  That rig
costs more than some decent cars LOL...  I was just privileged enough to
get to make parts for it. I has also been tuned by Alan Zasadny one of the
best PCP airgun tuners in the world.  It is just a sick cool airgun and I
thought someone might enjoy seeing it. I am glad you like it and it sounds
like your rifle is also nice.  Cheers!! Peace


Pete



On Thu, Jun 12, 2014 at 11:10 AM, Gene Heskett ghesk...@wdtv.com wrote:

 On Thursday 12 June 2014 10:53:05 Pete Matos did opine
 And Gene did reply:
  I was under the impression that this was in the latest master release a
  bit ago.  I thought you had to enable something to make it work. There
  were some  folks testing it tho.  I really would like to get this on
  my machine soon.  I still have some work to do to my Cincinatti Arrow
  500 VMC retrofit but it is getting there.  The machine works really
  well now and the parts I am  making are coming out excellent thanks in
  large part to LinuxCNC.  Here is a photo of my latest creations on a
  custom precision air rifle. I am kinda proud of them so if you have
  seen them before please forgive the unabashed showing off LOL.. peace
 
  Pete

 Wow Pete, thats one sweet looking paper punch.  I'd be proud to drag that
 out at the range. I'll bet it gets the oooh's and aah's when you do too.

 I've got a BP 50 cal that gets comments (but not from the purists, they
 don't like thumb hole stocks) but they quit bitching when they look at the
 size of the group it just shot.

 That is very nice, beats anything I've done for sure.

 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
 US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS


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Re: [Emc-users] New trajectory planner merged into LinuxCNC's development branch

2014-06-12 Thread sam sokolik
This is even sexier

Torchoidal path..  (graphing x and y acceleration and xyz velocity)
http://electronicsam.com/images/KandT/testing/Screenshot%20from%202014-03-20%2008:56:12.png

Old tp  G64  (about 30ipm or 762mm/m
http://electronicsam.com/images/KandT/testing/Screenshot%20from%202014-03-21%2010:44:16.png
Old tp G64Q.1 (about 60ipm  or 1500mm/m)
http://electronicsam.com/images/KandT/testing/Screenshot%20from%202014-03-21%2010:43:06.png

New tp... G64 (120ipm or 3000mm/m - programmed feed)
http://electronicsam.com/images/KandT/testing/Screenshot%20from%202014-03-21%2013:01:31.png

Nice sin-cos acceleration - reaches programmed feed..

sam


On 06/12/2014 09:41 AM, Sebastian Kuzminsky wrote:
 On 6/12/14 06:15 , sam sokolik wrote:
 http://electronicsam.com/images/KandT/testing/steve.ngc
 ...
 New TP
 http://electronicsam.com/images/KandT/testing/Screenshot%20from%202014-06-12%2006:54:17.png

 It gets up to the programmed feed and stays there.
 That's a really striking demonstration, Sam!


 On 6/12/2014 2:28 AM, Steve Blackmore wrote:
 If so, why the delay to 2.7 and not put it in 2.6?
 It's not in 2.6 because 2.6 is too close to release to introduce such
 deep changes.




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[Emc-users] new 2.6 pre-release

2014-06-12 Thread Sebastian Kuzminsky
Good morning folks, I just pushed 2.6.0~pre4 to the debian archive a 
linuxcnc.org.

Here is the changelog (since 2.6.0~pre3):

   * fix several bugs with NURBS handling (G5, G5.1, G5.2)
   * add a Rapid Override control (analogous to Feed Override)
   * support moving 3, 6, or all 9 axes for a tool change

   * add a driver for the WJ200 VFD
   * add a driver for the Mesa 7i90 AnyIO board

   * general mechatronics: fix a NULL pointer bug

   * touchy: accept all axes for G43.1 TLOs
   * gmoccapy: fix a couple of bugs

   * comp: reject invalid .comp files that don't match the component name

   * docs: add docs for G5, G5.1, G5.2 NURBS G-codes
   * docs: clarify naming requirements of .comp files
   * docs: update classic ladder manpage
   * docs: add info on the servo axis calibration assistant in Axis GUI
   * docs: misc minor fixes

   * fix a crawling scrollbar cosmetic bug in linuxcnctop
   * fix handling of shell metacharacters in .ini filenames
   * fix auto-closing of directories in config picker


Thanks to the people who are testing these pre-releases and reporting 
bugs, and to the people improving the code and documentation.

The contributors to 2.6.0~pre4 were:

Bence Kovacs
Chris Morley
Chris Radek
Curtis Dutton
Dewey Garrett
Jeff Epler
John Thornton
Kim Kirwan
Norbert Schechner
Sebastian Kuzminsky


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Re: [Emc-users] new 2.6 pre-release

2014-06-12 Thread sam sokolik
we ran 2.6.0-pre3 on the KT also this last weekend.  No issues - no 
surprises.. (and this is a non-trivial machine... 2 mesa 5i20's, large 
ladder, Custom Comp and lots of hal logic)  oh - and an arduino 
measuring spindle temp.

The PID change for 'previous target' really helped tuning.  (Plus ChrisR 
worked his tuning magic.)  After a few minutes of tuning - he had Y (the 
worse axis tuned) at about .0005 following error at 180ipm.  Also 
(velocity mode amps) now the FF! makes sense.  all axis are set to '1'.  
(and that is all X and Z needed)

Very happy with the results.

thanks for all the hard work!
sam


On 6/12/2014 10:44 AM, Sebastian Kuzminsky wrote:
 Good morning folks, I just pushed 2.6.0~pre4 to the debian archive a
 linuxcnc.org.

 Here is the changelog (since 2.6.0~pre3):

 * fix several bugs with NURBS handling (G5, G5.1, G5.2)
 * add a Rapid Override control (analogous to Feed Override)
 * support moving 3, 6, or all 9 axes for a tool change

 * add a driver for the WJ200 VFD
 * add a driver for the Mesa 7i90 AnyIO board

 * general mechatronics: fix a NULL pointer bug

 * touchy: accept all axes for G43.1 TLOs
 * gmoccapy: fix a couple of bugs

 * comp: reject invalid .comp files that don't match the component name

 * docs: add docs for G5, G5.1, G5.2 NURBS G-codes
 * docs: clarify naming requirements of .comp files
 * docs: update classic ladder manpage
 * docs: add info on the servo axis calibration assistant in Axis GUI
 * docs: misc minor fixes

 * fix a crawling scrollbar cosmetic bug in linuxcnctop
 * fix handling of shell metacharacters in .ini filenames
 * fix auto-closing of directories in config picker


 Thanks to the people who are testing these pre-releases and reporting
 bugs, and to the people improving the code and documentation.

 The contributors to 2.6.0~pre4 were:

 Bence Kovacs
 Chris Morley
 Chris Radek
 Curtis Dutton
 Dewey Garrett
 Jeff Epler
 John Thornton
 Kim Kirwan
 Norbert Schechner
 Sebastian Kuzminsky




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Re: [Emc-users] new 2.6 pre-release

2014-06-12 Thread Sebastian Kuzminsky
On 6/12/14 09:59 , sam sokolik wrote:
 we ran 2.6.0-pre3 on the KT also this last weekend.  No issues - no
 surprises.. (and this is a non-trivial machine... 2 mesa 5i20's, large
 ladder, Custom Comp and lots of hal logic)  oh - and an arduino
 measuring spindle temp.

That's great to hear!


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Re: [Emc-users] New trajectory planner merged into LinuxCNC's development branch

2014-06-12 Thread Todd Zuercher
Ooo that is sexy.

- Original Message -
From: sam sokolik sa...@empirescreen.com
To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net
Sent: Thursday, June 12, 2014 11:38:25 AM
Subject: Re: [Emc-users] New trajectory planner merged into LinuxCNC's 
development branch

This is even sexier

Torchoidal path..  (graphing x and y acceleration and xyz velocity)
http://electronicsam.com/images/KandT/testing/Screenshot%20from%202014-03-20%2008:56:12.png

Old tp  G64  (about 30ipm or 762mm/m
http://electronicsam.com/images/KandT/testing/Screenshot%20from%202014-03-21%2010:44:16.png
Old tp G64Q.1 (about 60ipm  or 1500mm/m)
http://electronicsam.com/images/KandT/testing/Screenshot%20from%202014-03-21%2010:43:06.png

New tp... G64 (120ipm or 3000mm/m - programmed feed)
http://electronicsam.com/images/KandT/testing/Screenshot%20from%202014-03-21%2013:01:31.png

Nice sin-cos acceleration - reaches programmed feed..

sam


On 06/12/2014 09:41 AM, Sebastian Kuzminsky wrote:
 On 6/12/14 06:15 , sam sokolik wrote:
 http://electronicsam.com/images/KandT/testing/steve.ngc
 ...
 New TP
 http://electronicsam.com/images/KandT/testing/Screenshot%20from%202014-06-12%2006:54:17.png

 It gets up to the programmed feed and stays there.
 That's a really striking demonstration, Sam!


 On 6/12/2014 2:28 AM, Steve Blackmore wrote:
 If so, why the delay to 2.7 and not put it in 2.6?
 It's not in 2.6 because 2.6 is too close to release to introduce such
 deep changes.




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Re: [Emc-users] New trajectory planner merged into LinuxCNC's development branch

2014-06-12 Thread Gene Heskett
On Thursday 12 June 2014 11:16:28 Pete Matos did opine
And Gene did reply:
 Gene,
  Thanks man but UNFORTUNATELY it is not mine LOL.  I just machined
 the custom scope riser and the removable custom side focus wheel for
 it. I am also probably going to be making some range markers for the
 scope as well here soon.  The rifle is a stunner for sure and one of
 the meanest looking airguns I have ever seen. It is pretty much STUPID
 expensive LOL.  That rig costs more than some decent cars LOL...  I
 was just privileged enough to get to make parts for it. I has also
 been tuned by Alan Zasadny one of the best PCP airgun tuners in the
 world.  It is just a sick cool airgun and I thought someone might
 enjoy seeing it. I am glad you like it and it sounds like your rifle
 is also nice.  Cheers!! Peace
 
 
 Pete

Darn,  here I thought I'd discovered what keeps you out of the bars. ;)

And yes, I need to take some decent, like blanket backdrops to reduce the 
busyness of what I have taken.  That, and I tend not to send pix that 
could be interpreted by some anti-gun nut, out there for them to have a 
cow over.

Lets just say that every CF rifle in the cabinet is sitting in a thumbhole 
stock, all but the first one I did 50+ years ago, carved from scratch.

Cheers, Gene Heskett
-- 
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 soap, ballot, jury, and ammo. Please use in that order.
-Ed Howdershelt (Author)
Genes Web page http://geneslinuxbox.net:6309/gene
US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS

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Re: [Emc-users] New trajectory planner merged into LinuxCNC's development branch

2014-06-12 Thread Bertho Stultiens
On 06/12/2014 05:38 PM, sam sokolik wrote:
 This is even sexier
 Torchoidal path..  (graphing x and y acceleration and xyz velocity)
[snip]

Now I am a bit proud of myself with making the trochoidal example code.
Oh vanity, sometimes nice, other times it has a price ;-)


-- 
Greetings Bertho

(disclaimers are disclaimed)

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[Emc-users] .pit file extension

2014-06-12 Thread Rick Lair
Hello Guys,

 

I have been trying to break into a file on one of my other machines control,
and I am not succeeding. The file has a .pit file extension,

 

Any suggestions on what I should use to open it??

 

 

Thanks

 

Rick

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Re: [Emc-users] .pit file extension

2014-06-12 Thread rayj
If you're using MS software, sometimes just changing the extension (.pit 
to .txt or other) will allow you to open it.

Raymond Julian
Kettle River, MN

The things we admire in men, kindness and generosity, openness, honesty, 
understanding and feeling are the concomitants of failure in our system. 
And those traits we detest, sharpness, greed, acquisitiveness, meanness, 
egotism and self-interest are the traits of success. And while men 
admire the quality of the first they love the produce of the second. 
-John Steinbeck, novelist, Nobel laureate (1902-1968)

On 06/12/2014 12:06 PM, Rick Lair wrote:
 Hello Guys,



 I have been trying to break into a file on one of my other machines control,
 and I am not succeeding. The file has a .pit file extension,



 Any suggestions on what I should use to open it??





 Thanks



 Rick

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 https://lists.sourceforge.net/lists/listinfo/emc-users


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Re: [Emc-users] .pit file extension

2014-06-12 Thread Philipp Burch
On 12.06.2014 19:06, Rick Lair wrote:
 Hello Guys,
 
  
 
 I have been trying to break into a file on one of my other machines control,
 and I am not succeeding. The file has a .pit file extension,
 
  
 
 Any suggestions on what I should use to open it??
 
  

Hi Rick,

I don't know the file format, but here are a few suggestions:

- http://file.org/extension/pit
  - It is probably an archive/container format. Or it has something to
do with the mentioned Predator CNC Editor
- Try what the file command says ($ file yourfile.pit)
- You are sure that it is .pit and not .bit, right? The latter could be
a binary file for FPGA configuration.
- Use the hex editor as mentioned.

Regards,
Philipp



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Re: [Emc-users] .pit file extension

2014-06-12 Thread Kirk Wallace
On 06/12/2014 10:06 AM, Rick Lair wrote:
 Hello Guys,
 I have been trying to break into a file on one of my other machines control,
 and I am not succeeding. The file has a .pit file extension,

 Any suggestions on what I should use to open it??
 Thanks
 Rick


You might try gHex: http://directory.fsf.org/wiki/Ghex

gHex should be in your software Synaptic package manager. This might 
give you an idea on what is inside the file.


-- 
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http://www.wallacecompany.com/E45/

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Re: [Emc-users] New trajectory planner merged into LinuxCNC's development branch

2014-06-12 Thread andy pugh
On 12 June 2014 17:23, Gene Heskett ghesk...@wdtv.com wrote:
  That, and I tend not to send pix that
 could be interpreted by some anti-gun nut, out there for them to have a
 cow over.


I made this the other day :-)

https://picasaweb.google.com/lh/photo/gS7y8Mh-EUSzD7C_XNmxUtMTjNZETYmyPJy0liipFm0?feat=directlink
-- 
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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] New trajectory planner merged into LinuxCNC's development branch

2014-06-12 Thread sam sokolik
Yes! - that was an awesome test program.  Thank you

sam

On 6/12/2014 11:22 AM, Bertho Stultiens wrote:
 On 06/12/2014 05:38 PM, sam sokolik wrote:
 This is even sexier
 Torchoidal path..  (graphing x and y acceleration and xyz velocity)
 [snip]

 Now I am a bit proud of myself with making the trochoidal example code.
 Oh vanity, sometimes nice, other times it has a price ;-)




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Re: [Emc-users] .pit file extension

2014-06-12 Thread Rick Lair
Thanks Guys,

The first thing I found was Frhed on a Google search for hex editor, and it
work fine, opened it up and now I just have to be able to decipher it, way
over my head.

It's the plc program from a turning center with a 7 year old Commercial
control on it, and the lathe is a carbon copy of the three that I have put
LinuxCNC on. I want to compare the logic for the tool turret between them.

Thanks Again

Rick


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Re: [Emc-users] .pit file extension

2014-06-12 Thread jrmitchellj .
I would try a hex editor like 0xed to open it  see if anything makes sense.

Ray

--J. Ray Mitchell Jr.
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(818)324-7573


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And those traits we detest, sharpness, greed, acquisitiveness, meanness,
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the quality of the first they love the produce of the second.
-John Steinbeck, novelist, Nobel laureate (1902-1968)



On Thu, Jun 12, 2014 at 10:06 AM, Rick Lair r...@superiorroll.com wrote:

 Hello Guys,



 I have been trying to break into a file on one of my other machines
 control,
 and I am not succeeding. The file has a .pit file extension,



 Any suggestions on what I should use to open it??





 Thanks



 Rick


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Re: [Emc-users] Feed control

2014-06-12 Thread a k
It was interesting help in all aspects.

World is theater and people actors. So we all play some role.



It did not discourage me.

Why?

Less than 7 month ago The United States Government could not find smart
contractor to make gov. health care web to work properly. We are talking
about The United States Government!

Order to build such web looks like was given about a year -12 month ahead
of time.

The result – was disaster – nothing was working right.

Question is why smart people around of word did not react and help to The
United States Government?

Or maybe they did!!

Or probably they set similar respond that I got.

Why not?



Sounds like a comedy story, but very probable one.

Who was the contractor for the US Government – big software company – and
it was not for FREE for sure.

Another fact.

In State of Oregon, Government of State of Oregon contracted similar job-
similar web for health care to

ORACLE -- http://www.oracle.com/index.html-- who does not know it???

Own by famous Lawrence Joseph Larry Ellison -
http://en.wikipedia.org/wiki/Larry_Ellison

And after spending many millions  – web for Oregon still did not
work right—Gov. of State of Oregon decided to abandon all work that was
done by ORACLE and joint the federal gov  medical web.





1--- “You are a bottomless pit of a sense of entitlement.”

2 “Please, use your grey cells to understand”

3“giving a man a fish versus teaching him, how to catch
a fish.”

4“demanding a free consultation, and then not taking the medicine he
prescribes for you!
What was that you were saying about logic and common sense?”

5“What you are doing now is not working.”

6“for what you want to do and then ask for bids for
the work.”



7“help
your are all wasting their time and are obviously frustrated.”

8-“ask for bids for
the work.”

9“I think you should control your anger.
Never seen anybody calling you stupid or brainless. Neither seen anybody
being disrespectful to you.”



Just look remarkable statements above.

Did United State government received similar because of web for health
care?

This is not LinuxCNC this is major web creation. Much More companies it web
creation business

Why ORACLE could not do it?

Maybe same people that address angry e-mal to me can share their valuable
opinion with  Larry Ellison /ORACLE--about why web for State of Oregon
could not be fix?



A lot to learn from this e-mail.

I think it should conclude moral teaching/lecturing part.

Conclusion.

   1. Look a bigger world around of you. Look on what you said from longer
   distance.
   2. Concentrate on important part and that will change over the time.






On Wed, Jun 11, 2014 at 11:49 AM, a k pccncmach...@gmail.com wrote:

 ///
 I think you should control your anger.
 Never seen anybody calling you stupid or brainless. Neither seen anybody
 being disrespectful to you.
 

 you free to take any position.
 everyone can read and see who can and who can not control anger or better
 who has anger at all.
 just look in what converted so call help?


 On Wed, Jun 11, 2014 at 11:26 AM, Bas de Bruijn bdebru...@luminize.nl
 wrote:



  On 11 jun. 2014, at 20:11, a k pccncmach...@gmail.com wrote:
 
  People have rights to stop responding. that is their rights. no problem
  there.
  again and again - *people have no rights to call anyone -* stupid -
  brainless  -- use your grey cells  etc
  or/and give smart remarks -giving a man a fish versus teaching him,
 how
  to catch a fish.
 
  is this hard to understand?
  is this a lot to ask?
  is this hard to be a human and respect yourself and others?
  does help give permission to call other stupid - brainless?
  should people control their anger ?

 I think you should control your anger.
 Never seen anybody calling you stupid or brainless. Neither seen anybody
 being disrespectful to you.

 
 
 
 
 
 
 
  On Wed, Jun 11, 2014 at 8:49 AM, Dave Cole linuxcncro...@gmail.com
 wrote:
 
  If you are not getting it after this lengthy exchange, offer to pay
  someone to do it for you.
 
  Write a specification for what you want to do and then ask for bids for
  the work.
 
  What you are doing now is not working.
 
  It appears that you, and the other people who are attempting to help
  your are all wasting their time and are obviously frustrated.
 
  Dave
 
  On 6/11/2014 5:45 AM, a k wrote:
  about
  //
  why would anyone reply to your questions after you have
  shown such an ignorance to their attempt to help?
  ///
  i do not ignore any one.
  i did not post here to *aggravate any one.*
  *last time i open hal in 2007 and after that 4 weeks ago.*
  *that is all my knowledge of hal.   *
  *i just do not know a lot about of hal *
  *i maybe single person in history of mankind that does not understand
 HAL
  component and how to use them. *
  *sorry *
  *again - * it does not give you/anyone permission to call 

Re: [Emc-users] .pit file extension

2014-06-12 Thread John Alexander Stewart
or just put it through strings and see what prints out.

JohnS.
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Re: [Emc-users] Ball Screw Drive?

2014-06-12 Thread Viesturs Lācis
2014-06-12 16:52 GMT+03:00 Todd  Zuercher
zuerc...@embarqmail.com:
 I don't really have a good reason, more exploring options and thinking out 
 loud, not really wanting to fight with the problems with gantries in LinuxCNC,

Well, I do not see much issues with LinuxCNC regarding gantry machines.
So far (up to 2.5.4) there have been 2 things to watch out for:
1) machine would remain in joint mode, if MDI command is executed
through halui from pyvcp button (this affects any machine with
nontrivial kinematics);.
2) operator has to remember to switch to world mode after homing all
joints, otherwise jogging machine will cause jogging just one side of
gantry..

First one is fixed in 2.6 branch.
Second one is fixed by something like 30 minute (including dowloading
source code from git) setup routine - start by adding few lines to
Axis script to create hal pin in Axis GUI that switches to world mode,
then connect it to axis.n.homed pins through and4 module (created by
customizing and2 module).

I do not know of any other gantry-related issues (just spent another 5
hours with my gantry router and making some chips, LinuxCNC works just
wonderfully).

Viesturs

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Re: [Emc-users] .pit file extension

2014-06-12 Thread Troy Jacobson
If by pic, you mean a Microchip PIC program, you should grab a PIC
disassembler.  There are ones available for Linux (don't know the name) or
you could get MPLab X from microchip.


On Thu, Jun 12, 2014 at 3:15 PM, John Alexander Stewart ivatt...@gmail.com
wrote:

 or just put it through strings and see what prints out.

 JohnS.
 ​

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Re: [Emc-users] .pit file extension

2014-06-12 Thread Ralph Stirling
Rick,

More information about the original controls might help.  Many people
on this list have used regular CNC turning centers.  Exact make and model
of the original control and the lathe would be a good start.  Do you have
any manuals for it now?  Often the service or electrical manual will have
ladder diagrams for the PLC portion of the control.  If we don't have what
you need on this group, you could pose a question to the Practical Machinist
CNC forum, where someone is likely to have the exact manual you need or
could otherwise get you information on your machine's turret operation.

-- Ralph

From: Rick Lair [r...@superiorroll.com]
Sent: Thursday, June 12, 2014 10:51 AM
To: emc-users@lists.sourceforge.net
Subject: Re: [Emc-users] .pit file extension

Thanks Guys,

The first thing I found was Frhed on a Google search for hex editor, and it
work fine, opened it up and now I just have to be able to decipher it, way
over my head.

It's the plc program from a turning center with a 7 year old Commercial
control on it, and the lathe is a carbon copy of the three that I have put
LinuxCNC on. I want to compare the logic for the tool turret between them.

Thanks Again

Rick


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Re: [Emc-users] Ball Screw Drive?

2014-06-12 Thread Stephen Dubovsky
On Thu, Jun 12, 2014 at 5:09 PM, rayj raymo...@frontiernet.net wrote:

 ...
 Assuming identical motors and driver boards, is it possible to wire both
 driver boards to the same output from the breakout board.  Example: run
 the wires from the BOB X-axis step pin to the step input for 2 drivers
 and the X-axis direction pin to dir input on both drivers?  Power, watch
 dog, etc. wired as necessary for safe operation.


Yes.  You can run as many stepper drivers as you like off the same signals
assuming there is enough electrical drive to run all the optos.

I have an Accucut 48 router that was wired that way from the factory
(different control.)  When I converted it to LCNC I didn't change it for
simplicity.  Works fine.  It has a very slight rack that some day I will
correct when I add a second home switch and run separate step/dir cable to
the 2nd motor controller.
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Re: [Emc-users] Ball Screw Drive?

2014-06-12 Thread Gene Heskett
On Thursday 12 June 2014 17:09:45 rayj did opine
And Gene did reply:
 A general question on using two motors in this situation.  I'm using
 steppers, so I'll frame the question for them.
 
 Assuming identical motors and driver boards, is it possible to wire
 both driver boards to the same output from the breakout board. 
 Example: run the wires from the BOB X-axis step pin to the step input
 for 2 drivers and the X-axis direction pin to dir input on both
 drivers?  Power, watch dog, etc. wired as necessary for safe
 operation.

Generally speaking, Not before a good, gantry is square, home has been 
achieved.

Why?  Because there are going to be residual mechanical sync errors 
between the two motors that will push one or both to be slightly out of 
sync with the other when powered down, that, coupled with the fact that 
most stepper drivers power up at what they think is the home/index 
position, and the motors will turn to the nearest position from where they 
are, making it possible that they are a major portion of a full step out 
of sync just from being powered up.  How far out of square the gantry is 
depends on your gear ratio's of course.

The ideal situation would seem to be a switch on each end of the gantry, 
that when it is just closed, would stop the driver on that side while 
allowing the other side to continue looking for its switch.  And I would 
like to see a counter that would stop it and advise the operator there is 
a potential square error if it counts to 1 or 2 more than the driver is 
microstepping.  Something in the drive on one end or the other may have 
slipped.  Such a warning might save you from making 20 parts, all of which 
are out of square. 
 
Once this synced state has been achieved, then it might be feasable to 
drop to one stepgen.  But since you had to have two to home properly, you 
may as well go ahead and use both.

 2nd question: Is there a glossary/dictionary of terms/acronyms used
 regularly on this list.  I have a hard time figuring some of them out.
 I'm thinking of LCNC/machining terms, specifically.
 
 TIA

ISTR there is a glossary in the various pdf manuals, last couple of pages 
are where I'd check.

I hope this is helpful Raymond, but someone else here may have a better 
idea.  I'd almost bet on it. ;-)

 Raymond Julian
 Kettle River, MN
 
 The things we admire in men, kindness and generosity, openness,
 honesty, understanding and feeling are the concomitants of failure in
 our system. And those traits we detest, sharpness, greed,
 acquisitiveness, meanness, egotism and self-interest are the traits of
 success. And while men admire the quality of the first they love the
 produce of the second. -John Steinbeck, novelist, Nobel laureate
 (1902-1968)
 
 On 06/12/2014 03:42 PM, Viesturs Lؤپcis wrote:
  2014-06-12 16:52 GMT+03:00 Todd  Zuercher
  
  zuerc...@embarqmail.com:
  I don't really have a good reason, more exploring options and
  thinking out loud, not really wanting to fight with the problems
  with gantries in LinuxCNC,
  
  Well, I do not see much issues with LinuxCNC regarding gantry
  machines. So far (up to 2.5.4) there have been 2 things to watch out
  for: 1) machine would remain in joint mode, if MDI command is
  executed through halui from pyvcp button (this affects any machine
  with nontrivial kinematics);.
  2) operator has to remember to switch to world mode after homing all
  joints, otherwise jogging machine will cause jogging just one side of
  gantry..
  
  First one is fixed in 2.6 branch.
  Second one is fixed by something like 30 minute (including dowloading
  source code from git) setup routine - start by adding few lines to
  Axis script to create hal pin in Axis GUI that switches to world
  mode, then connect it to axis.n.homed pins through and4 module
  (created by customizing and2 module).
  
  I do not know of any other gantry-related issues (just spent another
  5 hours with my gantry router and making some chips, LinuxCNC works
  just wonderfully).
  
  Viesturs
  
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Re: [Emc-users] Ball Screw Drive?

2014-06-12 Thread Gregg Eshelman
On 6/12/2014 7:52 AM, Todd Zuercher wrote:
 I don't really have a good reason, more exploring options and thinking out 
 loud, not really wanting to fight with the problems with gantries in 
 LinuxCNC, the machines only has 3 motors and drives, now and these model 
 drives, and motors and drives are discontinued so getting a matching one may 
 be impossible (I know I could swap the Z or X to the 2nd Y).  It looks like 
 the mechanical drawbacks of trying to use 1 motor may be outweighing the 
 configuration issues in Linuxcnc.

My opinion is the most stable way to do it is with a drive shaft in the 
middle that has two cogged pullies or sprockets at each end and a 
matching cogged pulley or sprocket at each end of the long ballscrews. 
Run two belts or chains at each end, one to each side.

If the motor is double shaft it could be put in the center of the drive 
shaft under the table to further reduce torsional flex.

Or if the current setup is using one chain or belt connecting the 
ballscrews at one end, with the other ends free, just duplicate the 
connection at the other end. That should help some but not as much as 
keeping any one piece of the drive system as short as possible.

 I am still in the stage of working out plans and strategies to propose to my 
 superiors.  You know they type, Why do you want to spend a bunch of money 
 upgrading the machine, its been running that way for the past 10 years, yeah 
 and I am continually receiving complaints about the carving quality, asking 
 me if there is anything I can do to improve it.


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Re: [Emc-users] Ball Screw Drive?

2014-06-12 Thread rayj
A general question on using two motors in this situation.  I'm using 
steppers, so I'll frame the question for them.

Assuming identical motors and driver boards, is it possible to wire both 
driver boards to the same output from the breakout board.  Example: run 
the wires from the BOB X-axis step pin to the step input for 2 drivers 
and the X-axis direction pin to dir input on both drivers?  Power, watch 
dog, etc. wired as necessary for safe operation.

2nd question: Is there a glossary/dictionary of terms/acronyms used 
regularly on this list.  I have a hard time figuring some of them out. 
I'm thinking of LCNC/machining terms, specifically.

TIA

Raymond Julian
Kettle River, MN

The things we admire in men, kindness and generosity, openness, honesty, 
understanding and feeling are the concomitants of failure in our system. 
And those traits we detest, sharpness, greed, acquisitiveness, meanness, 
egotism and self-interest are the traits of success. And while men 
admire the quality of the first they love the produce of the second. 
-John Steinbeck, novelist, Nobel laureate (1902-1968)

On 06/12/2014 03:42 PM, Viesturs Lācis wrote:
 2014-06-12 16:52 GMT+03:00 Todd  Zuercher
 zuerc...@embarqmail.com:
 I don't really have a good reason, more exploring options and thinking out 
 loud, not really wanting to fight with the problems with gantries in 
 LinuxCNC,

 Well, I do not see much issues with LinuxCNC regarding gantry machines.
 So far (up to 2.5.4) there have been 2 things to watch out for:
 1) machine would remain in joint mode, if MDI command is executed
 through halui from pyvcp button (this affects any machine with
 nontrivial kinematics);.
 2) operator has to remember to switch to world mode after homing all
 joints, otherwise jogging machine will cause jogging just one side of
 gantry..

 First one is fixed in 2.6 branch.
 Second one is fixed by something like 30 minute (including dowloading
 source code from git) setup routine - start by adding few lines to
 Axis script to create hal pin in Axis GUI that switches to world mode,
 then connect it to axis.n.homed pins through and4 module (created by
 customizing and2 module).

 I do not know of any other gantry-related issues (just spent another 5
 hours with my gantry router and making some chips, LinuxCNC works just
 wonderfully).

 Viesturs

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Re: [Emc-users] Ball Screw Drive?

2014-06-12 Thread rayj
I wondered if that might be a problem.  I'm thinking I could use a 
manual pulse generator to square it up at startup and have a set of home 
switches that could be touched off on as necessary to assure that the 
system is still square.  If it isn't then the operation would be stopped 
and it could be manually squared again.

It is my understanding that the usual cause of missed steps is heavy 
loading of the motor.  Assuming this is minimized, I think this might be 
a viable system.

Keep in mind that this a hobby setup, so other things besides pure 
economics drive the decisions.


Raymond Julian
Kettle River, MN

The things we admire in men, kindness and generosity, openness, honesty, 
understanding and feeling are the concomitants of failure in our system. 
And those traits we detest, sharpness, greed, acquisitiveness, meanness, 
egotism and self-interest are the traits of success. And while men 
admire the quality of the first they love the produce of the second. 
-John Steinbeck, novelist, Nobel laureate (1902-1968)

On 06/12/2014 04:53 PM, Gene Heskett wrote:
 On Thursday 12 June 2014 17:09:45 rayj did opine
 And Gene did reply:
 A general question on using two motors in this situation.  I'm using
 steppers, so I'll frame the question for them.

 Assuming identical motors and driver boards, is it possible to wire
 both driver boards to the same output from the breakout board.
 Example: run the wires from the BOB X-axis step pin to the step input
 for 2 drivers and the X-axis direction pin to dir input on both
 drivers?  Power, watch dog, etc. wired as necessary for safe
 operation.

 Generally speaking, Not before a good, gantry is square, home has been
 achieved.

 Why?  Because there are going to be residual mechanical sync errors
 between the two motors that will push one or both to be slightly out of
 sync with the other when powered down, that, coupled with the fact that
 most stepper drivers power up at what they think is the home/index
 position, and the motors will turn to the nearest position from where they
 are, making it possible that they are a major portion of a full step out
 of sync just from being powered up.  How far out of square the gantry is
 depends on your gear ratio's of course.

 The ideal situation would seem to be a switch on each end of the gantry,
 that when it is just closed, would stop the driver on that side while
 allowing the other side to continue looking for its switch.  And I would
 like to see a counter that would stop it and advise the operator there is
 a potential square error if it counts to 1 or 2 more than the driver is
 microstepping.  Something in the drive on one end or the other may have
 slipped.  Such a warning might save you from making 20 parts, all of which
 are out of square.

 Once this synced state has been achieved, then it might be feasable to
 drop to one stepgen.  But since you had to have two to home properly, you
 may as well go ahead and use both.

 2nd question: Is there a glossary/dictionary of terms/acronyms used
 regularly on this list.  I have a hard time figuring some of them out.
 I'm thinking of LCNC/machining terms, specifically.

 TIA

 ISTR there is a glossary in the various pdf manuals, last couple of pages
 are where I'd check.

 I hope this is helpful Raymond, but someone else here may have a better
 idea.  I'd almost bet on it. ;-)

 Raymond Julian
 Kettle River, MN

 The things we admire in men, kindness and generosity, openness,
 honesty, understanding and feeling are the concomitants of failure in
 our system. And those traits we detest, sharpness, greed,
 acquisitiveness, meanness, egotism and self-interest are the traits of
 success. And while men admire the quality of the first they love the
 produce of the second. -John Steinbeck, novelist, Nobel laureate
 (1902-1968)

 On 06/12/2014 03:42 PM, Viesturs Lؤپcis wrote:
 2014-06-12 16:52 GMT+03:00 Todd  Zuercher

 zuerc...@embarqmail.com:
 I don't really have a good reason, more exploring options and
 thinking out loud, not really wanting to fight with the problems
 with gantries in LinuxCNC,

 Well, I do not see much issues with LinuxCNC regarding gantry
 machines. So far (up to 2.5.4) there have been 2 things to watch out
 for: 1) machine would remain in joint mode, if MDI command is
 executed through halui from pyvcp button (this affects any machine
 with nontrivial kinematics);.
 2) operator has to remember to switch to world mode after homing all
 joints, otherwise jogging machine will cause jogging just one side of
 gantry..

 First one is fixed in 2.6 branch.
 Second one is fixed by something like 30 minute (including dowloading
 source code from git) setup routine - start by adding few lines to
 Axis script to create hal pin in Axis GUI that switches to world
 mode, then connect it to axis.n.homed pins through and4 module
 (created by customizing and2 module).

 I do not know of any other gantry-related issues (just spent another
 5 hours 

Re: [Emc-users] Ball Screw Drive?

2014-06-12 Thread Gene Heskett
On Thursday 12 June 2014 19:20:24 rayj did opine
And Gene did reply:
 I wondered if that might be a problem.  I'm thinking I could use a
 manual pulse generator to square it up at startup and have a set of
 home switches that could be touched off on as necessary to assure that
 the system is still square.  If it isn't then the operation would be
 stopped and it could be manually squared again.
 
With a box in the data line so you could do that manually, it ought to be 
doable.

 It is my understanding that the usual cause of missed steps is heavy
 loading of the motor.  Assuming this is minimized, I think this might
 be a viable system.

Two ways to lose it actually.  Accelerations that exceed what it can do 
are one, and heavy loading would be the other,  both coming into more 
obvious play when the motor voltages are less than 30 volts.  Even 30 
volts rules out using the single chip drivers as that is about the point 
where they let out all the smoke  don't work any more.
 
 Keep in mind that this a hobby setup, so other things besides pure
 economics drive the decisions.

Here, I have just 2 machines, an old HF micromill with the LMS bigger 
table kit, 4 axis's, running on a medical grade (for whatever thats worth) 
28 volt 12.5 amp supply.

And a 7x12 lathe running on a home made supply making about 38 volts and 5 
or so amps.  Both are using the 2M542 driver, up to 4.2 amps  50 volts.  
The difference in PSU voltage translates to the lathe being able to move 
at 3 or 4 times the mills speed, with the mill getting stally when I ask 
it for 15 ipm.  The lathe with the additional 10 volts can move the X at a 
little better than 60 ipm.

That 2M542 driver seems to be bulletproof, when I threw out the A-3977 
based single chip drivers because yet another had blown, I bought a spare, 
and 2+ years later it is still in its packing box in a drawer of the tool 
chest.  Careful shopping on ebay can probably buy them at about 50 bucks a 
driver.  Highly recommended by great-grandpa Gene, I don't think you'll 
need to replace them, at least in this decade, handily outlasting me.  
Yeah, I am that old, I'll be 80 in October. :)

 Raymond Julian
 Kettle River, MN

Oh, and let me welcome you to one of the best kept secrets in CNC.  
LinuxCNC.

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
US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS

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[Emc-users] Desktop file for HTML documents

2014-06-12 Thread Trần Ngọc Quân
Dear debian package maintain,
I can't open G-code Quick Reference from Gnome menu. I discover that
desktop file for them is not suitable for Debian.
In Debian GNU/Linux 7 (wheezy), missing /usr/bin/x-www-browser, so
postinst[0] must use update-alternatives[1] for install it.

Append debian/linuxcnc.postinst lile that:

if [ ! -f /usr/bin/x-www-browser ] ; then
if [ -f /usr/bin/firefox ]; then
update-alternatives --install /usr/bin/x-www-browser
x-www-browser /usr/bin/firefox 0
fi
# do the same with other html browser!
fi

I'm using linuxcnc-sim 2.7.0~pre0.122.ge9b0e


[0] http://www.debian.org/doc/manuals/maint-guide/dother.en.html
[1] http://www.debian-administration.org/articles/91

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Re: [Emc-users] Ball Screw Drive?

2014-06-12 Thread Bas de Bruijn

On 12 Jun 2014, at 02:34, Todd Zuercher zuerc...@embarqmail.com wrote:

 The machine is one that has had a problematic (under engineered drive train) 
 from the get-go.  It is an 8 spindle gang router for wood carving, with a 
 12ft long gantry that has about 5ft of travel (Y-axis).  Even though the X is 
 on a 12ft gantry it only has a little over 3ft of usable travel.  X and Z 
 both currently use 0 backlash lead screws (these are showing some age) and I 
 want to replace them with ball screws, with a shorter pitch and instal better 
 fixing blocks (what is there now is pretty el cheapo and is adding a lot of 
 backlash).  

When reducing the pitch, you can have a higher thrust. Mainiainting the same 
speed means you’ll have higher RPM. When designing the fixing bearing 
construction there’s deciding which side of the spindle to fix, an which to 
slide.
The spindle is not only about the ratio, the geometry (diameter) of the spindle 
and it’s lengths have a great influence I’d advice doing some calculations on 
buckling and vibrations for the spindles max RPM and thrust.

most vendors have example calculations.

 My hope is to reduce backlash, reduce friction, and increase mechanical 
 advantage, in the hope of improving acceleration and stability.  The changes 
 on the Z will change the encoder resolution from about 8K counts/inch to 
 about 10K, X will go from about 4.5K to 10K.  this all sounds relatively 
 simple so far.  
 
 That leaves the problem child Y axis.  It has a helical rack and pinion (~2 
 inch diameter pinion) on each end of the gantry connected together by 2.5 
 inch diameter torsion tube.  The drive is on the outside and consists of a 
 large fine toothed timing belt pulley (about 8 inch diameter on the pinion 
 shaft) and a very very small one on the servo motor (less than .75).  Tooth 
 count on the big one is 212, and I can't see the little one to count it right 
 now it might be as small as 14 teeth.  Regardless what the actual ratios are, 
 a 2000 count (8K quad) encoder on the motor gives about 7.5K count/inch.  
 Other than the step motor esque gearing, I think my biggest problem is belt 
 squirm on the ultra small motor pulley.
 
 I think a would be happy with +-0.001 inches accuracy and satisfied with 
 +-.002  The machine is all aluminum construction so is far from heavy duty, 
 but it isn't some light hobby job either.
 
 All the servos are 850oz/in. (I think I'll have to check the numbers to be 
 sure).
 
 I was considering just putting a ball screw on just one side of the gantry 
 and leaving the racks and pinions alone (still connected).  I know it kind of 
 still leaves the far side to flop around, but it's doing that already 
 (torsional flex is a bitch ain't it).

yes it is :) Especially because you want the nut of the spindle to be parallel 
with the axis. If you have forces other than pure couple, then the life of the 
ball nut is reduced.

 
 I had thought about using 2 90 deg gear boxes, but their expense and fear of 
 backlash has me shying away. 
 
 I may be best just biting the bullet and going the 2 motor route.
 
 
 
 - Original Message -
 From: Bas de Bruijn bdebru...@luminize.nl
 To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net
 Sent: Wednesday, June 11, 2014 1:52:55 PM
 Subject: Re: [Emc-users] Ball Screw Drive?
 
 
 On 11 Jun 2014, at 19:00, Todd Zuercher zuerc...@embarqmail.com wrote:
 
 Any one have any ingenious ideas for a good way to drive two parallel ball 
 screws that are 12 feet appart (gantry router), with only 1 motor (instead 
 of 2) ? 
 
 Hi Todd,
 
 could you elaborate a little bit on the actual setup? Do you want to rotate 
 the nut on the gantry, or do you want to rotate the spindles on the frame 
 beneath?
 
 Either way, if you want to use 1 motor, then position it in the middle so 
 elasticity (I roughly calculate 3 feet in 1 meter) over the 4 meters is equal 
 on both sides. Otherwise you will have one of the nuts/spindles lagging 
 w.r.t. the other one.
 
 What is the torque you expect? and the tolerance you expect to mill? 
 What kind of finish (part/component quality) are you after?
 
 - 2 90 degree gearboxes with a shrink collar could be used. with a gearbox in 
 the middle.
 - Another way could be to put bevel gears on the end of the spindle and drive 
 that with 1 axis (again, motor in the middle).
 - or you could use an eccentric plate construction. A motor with an eccenter 
 who drives 1 plate. That plate is held in place by 3 executers. Then you put 
 an executer on both spindels/nuts and when the eccentric plate starts to move 
 the spindle/nut will be rotated. You’ll have a bad time fighting vibrations 
 :) you’ll need to counterbalance it so I guess it gets a little bulky. To get 
 the idea:  something like this, http://www.google.com/patents/US2342251 or 
 http://www.google.pl/patents/US4260301
 
 
 
 -- 
 
  
 
 Todd Zuercher 
 

Re: [Emc-users] Gscreen - Origin functions

2014-06-12 Thread Chris Morley
select an axis button on screen (such as x)
pressing zero origin will set the active user system to 0 
calls G10 L20 P0 [axis] 0

set origin uses the same idea other then it lets you
enter a value.
G10 L20 P0 [axis value]

Chris M

 Date: Thu, 12 Jun 2014 08:00:46 +0200
 From: mar...@mastercut.co.za
 To: emc-users@lists.sourceforge.net
 Subject: [Emc-users] Gscreen - Origin functions
 
 Can someone please explain to me how the Zero Origin and Offset 
 Origin in Gscreen works? Or how it is intended to work at least.
 
 -- 
 
 Regards /Groete
 
 Marius D. Liebenberg
 +27 82 698 3251
 +27 12 743 6064
 QQ 1767394877
 
 
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