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It was the backlash comp accel setting. I turned it off and the problem went away. Huzzah. This makes total sense because the issue only arose with axis directional changes or starts.
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So the motors seem reasonable, the mechanical setup is reasonable, the PSU is reasonable, no reason to believe the stepper driver is cooked. I'm led to believe that the computer is responsible for...

Thanks for the replies jfong, I appreciate it.

I found the datasheet for the steppers here.

Here is some questionable math:
30IPM = 600 RPM
/60 seconds = 10 RPS
*200 (steps/pulses)/rev =...

The PSU is 48v 7.3a. The steppers are 200oz-in.

Hey Guys, sorry to make my first post a "help me solve this" but I have done quite a bit of troubleshooting and reading and haven't been able to solve this problem.

Setup:
Microproto Micromill...