More Z-Axis Issues

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30 Oct 2019 22:28 #149229 by phillc54
Replied by phillc54 on topic More Z-Axis Issues
When it faults at the end of cut does it pause the program or stop the program?

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30 Oct 2019 22:38 #149231 by MakingStuff
Replied by MakingStuff on topic More Z-Axis Issues
Here is the config zipped up and the g-code that caused the error.
Attachments:
The following user(s) said Thank You: phillc54

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30 Oct 2019 22:39 #149232 by MakingStuff
Replied by MakingStuff on topic More Z-Axis Issues

When it faults at the end of cut does it pause the program or stop the program?


It pauses the program. I can hit the pause button but nothing happens.

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31 Oct 2019 01:00 - 31 Oct 2019 01:08 #149246 by phillc54
Replied by phillc54 on topic More Z-Axis Issues
Any error message?

Edit: the reason for the errors in the gcode file are the G00 commands on a line by their lonesome. Looks like I need more error checking...
Last edit: 31 Oct 2019 01:08 by phillc54.

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31 Oct 2019 02:15 #149250 by MakingStuff
Replied by MakingStuff on topic More Z-Axis Issues

Any error message?


The arc lost error and I think sometimes joint 3 following error which would be the z-axis.

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31 Oct 2019 02:36 #149252 by rodw
Replied by rodw on topic More Z-Axis Issues
The following error is due to poor latency. Remember, we are calling an interrupt routine to do stuff 1000 times a second on the servo thread. If the machine is not fast enough to do everything it needs to between calls to the servo thread a following error will be reported. (This is the real time part of Linuxcnc) That could result in unexpected behavior. If you can't improve your latency, you might be able increase your servo period time parameter. (eg every 1.2 milliseconds instead of every 1.0 milliseconds) The numbers in your Hal file are in nanoseconds.

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31 Oct 2019 16:56 #149295 by MakingStuff
Replied by MakingStuff on topic More Z-Axis Issues

The following error is due to poor latency. Remember, we are calling an interrupt routine to do stuff 1000 times a second on the servo thread. If the machine is not fast enough to do everything it needs to between calls to the servo thread a following error will be reported. (This is the real time part of Linuxcnc) That could result in unexpected behavior. If you can't improve your latency, you might be able increase your servo period time parameter. (eg every 1.2 milliseconds instead of every 1.0 milliseconds) The numbers in your Hal file are in nanoseconds.


Could I also just slow down that axis?

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31 Oct 2019 18:28 #149301 by PCW
Replied by PCW on topic More Z-Axis Issues
The following error settings in your ini file are quite small
I would set them larger
currently they are:

FERROR = 0.0002
MIN_FERROR = 0.0001

For all axis
I would set them to

FERROR = 0.006
MIN_FERROR = 0.001
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31 Oct 2019 21:27 - 31 Oct 2019 21:29 #149308 by MakingStuff
Replied by MakingStuff on topic More Z-Axis Issues
Changing the FERROR values has stopped the Joint 3 Following Error from happening. The z-axis has also stopped crashing. However, I still can't reseume when the arc is lost.

The steps I have to take to resume are:
1) Press the stop button. The z-axis moves down to 1 inch above work piece.
2) Now I can right click on the line that should be executed next, and select Run From Here.

It still does this at the end of a cut that falls into the water pan. Not all of the cuts that fall in cause this error ut it seems the larger pieces almost always cause the error to happen. I'm glad that I can at least salvage the workpiece when the error happens but would really like to stop this from happening in the first place.

Thanks to everyone that has helped get this far figuring it out.
Last edit: 31 Oct 2019 21:29 by MakingStuff.

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31 Oct 2019 23:18 #149317 by phillc54
Replied by phillc54 on topic More Z-Axis Issues
Are you running a Run In Place or a Buildbot version of LinuxCNC?

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