$1=255 set, axes are doing uncommanded moves. I got a hole from drilling (only Z movement, X and Y stayed at 0) that looks like this:
That’s not a round hole. And I felt the Y steppers actually stepping while it was drilling, with this gcode:
G0 X0.000 Y0.000
G1 Z-6.350 F8.47
Makes me wonder whether 3.3V signal is near a threshold for those stepper drivers and electrical noise is making them sense steps that aren’t there. I also got a phantom Y pin pressed notice once (the gantry was nowhere near the Y limit, and there was nothing anywhere near the switch to engage it).
Here’s my second (and, overlapping at the bottom, part of the my first) attempt to do a practice cut in styrofoam:
Those circles that aren’t quite coaxial are intended to be a 1 1/8" wide circular groove.
Should I be using a level shifter to clock the steppers?