Today, I was working on our twin spindle carving machine, and noticed that I was getting significantly different following errors on the W and Z axis. The axis are identical and so are the PID settings. Then I happened to check the pid errors. There the W and Z pid errors were the same. I scratched my head for a little while. I noticed that the W f-error seemed to be proportional to the velocity. I then went back and messed with the pid error-previous-target and found that if I set the pid error-previous-target to false for the W axis (all the others are true), then the axis.2.f-error and axis.8.f-error mostly matched. When I have the pid error-previous-target set to false for X, Y, or Z their f-errors become proportional to the velocity, but in the other direction. Any ideas what might be going on?
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