No Z-Axis but still getting Joint 2 follow error

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25 Dec 2018 03:56 #122859 by hatch789
Hi Guys, long ago I was helped with my LinuxCNC setup. The machine I use only has X & Y servos and no Z control (right now). One day I figured I might try to add the Z axis to it but that remains to be seen.

The reason for my post is that I'm still getting a "Joint 2 follow error" even though my Z axis is fully commented out in the TREE.INI file for my machine.

I would like to know if there's a way to eliminate follow errors or just make the Z allowance so large that I never get a follow error on that axis.
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25 Dec 2018 10:00 #122865 by Hakan
You can try to set
[TRAJ]
AXES = 2
COORDINATES = X Y
in the ini file.

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25 Dec 2018 14:50 #122869 by hatch789
I can try that but I'm curious how the SIM-AXIS machine does it for all 3 XYZ axis? It works so well for this simulated machine that's kind of what I'd like to do for my Z axis. See it changing numbers but not give any errors.

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25 Dec 2018 16:13 #122872 by PCW
You can do this by looping back the commanded position to the feedback position,
something like this:

net z-pos-cmd-and-fb <= axis.2.motor-pos-cmd => axis.2.motor-pos-fb
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26 Dec 2018 15:41 #122912 by hatch789

You can do this by looping back the commanded position to the feedback position,
something like this:

net z-pos-cmd-and-fb <= axis.2.motor-pos-cmd => axis.2.motor-pos-fb


That worked like a charm PCW. Thank you!

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