I am testing the electronics for my new machine and am having quite an issue with my stepper motor and/or driver and/or parallel port. I can't figure out what the issue is.
I have a large nema34 motor powered at 50V 7A by a Centent CN0142 Anti-Resonance Microstep Drive via 14awg wire hooked directly to a parallel port via shielded wire.
Mach 3 is set at 100kHz and axis x is at 20mm/s^2 accel and ~2500mm/s velocity. See attached picture.
The motor runs great up to about 1500mm/s but starts having issues at 1600. The motor is fine after a brief time in that range when it tops out at 3000mm/s. Please see the video:
http://www.youtube.com/watch?v=iuAtGrrvM9I]Strange Stepper Motor Mid-range Dropout - YouTube