slave axis racking

[PeterJK]

New build project - first time cnc project.
Rack and pinion drives on all axis.
Linear guiderails

Nema 23 4.2A motors. DM556 drivers. Microstepping set to 1/8 (1600 pulses/rev)
Kernel speed 25000hz

Y axis (long axis) slaved with A axis.

When I jog the y axis, I can see one side begin moving a fraction of a second before the other side.

First sample cut (Alien face engraving) pretty bad - where the contours should be smooth there are jogs, and each time I run the code, the jogs are in different places.

Any suggestions how I can fix this?

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[PeterJK]

Found the issue - one of the gears was slipping. Looks like this problem is solved.