Russ, I'm not sure...

How would one determine this?

Best Regards,

Preston

There will be 200 steps per motor rev and the Geckos are 10 microsteps so 2000 steps per rev. If you command a distance equal to 2000 steps then you will see which is lagging.
Hood

Ok, it's been a busy few weeks...but back to the problem...

Not quite sure how to command a move of 2000 steps, but moved with
 the DRO 0.500 inches, 1.000 inches and back to 0.000 with differing
configurations of YL stepper driving Left side of gantry, YR stepper driving
right side of gantry and X stepper driving right side of gantry.

In repeating going from 0.000 to 0.500 to 1.000 and back to 0.000
with the differing configurations I cannot get a repeatable error cycle.

All configurations vary from -0.002 to -0.032 inches and are not repeatable
in the amount of the error.

I did turn the jog rate down to 1.5% to be able to accurately set the amount
of the movements.

What on earth would that indicate? Bad control board??? I do have another
that I could swap this one with.

Best Regards

Preston

Ok, since no one offered any further ideas...

I changed the breakout board for a spare that I had.

Now when I move eitherstepper  motor via the DRO a certain distance and back
it returns to the same location with either stepper motor...

The left and right motors are within 0.020 of each other in a move of 1 inch and
when returning to 0.000 measure on the dial indicator 0.000 repeatably.

Thus, I believe that something was wrong with the other Breakout board...

Not sure what, but it was not repeatable at all.

Hopefully further testing will show more progress.

Best Regards,

Preston