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General Mach Discussion / Z axis inconsistent movement

« on: September 03, 2020, 06:07:27 PM »

Z axis inconsistent movement

My Z axis is creeping upward during the program run.
I have run the following gcode with a repeatable error.

The original location of Z 0
Code Run
Z10
Z0
Will give me a Z offset of +0.002mm each time I run it. But Mach 3 display is Z0.

Original location of Z 0
Code Run
Z5
Z10
Z0
Will give me a Z0 each time I run it and Mach 3 display is also Z0.

Basically start at Z0 with Z10 Z0 will give me an error in Z but Z5 Z10 Z0 will be correct.

Does anybody know how to fix this?