I'm using stepper motors and I have G203v (10 microstep) drivers on all axis, but on XY and Z the steps are set to 4000 steps and the screws are 2 TPI. So I'm "microstepping" and there are 2000 step pulses per turn.

On A the steps are currently set to 500, so I believe I'm set to "steps per degree" (as in 500 steps p/deg, 4 deg p/crank rot, 1:1 pulleys, 90:1 table gearing, 180,000 steps for 360 deg). It seems that 180,000 steps p/360 degrees is radically high, maybe I should be full-stepping (div by 10) and then the step relationship between XYZ and A will be closer?

I hope this is the info your asking for... and "Thanks" for helping!!!