so you have buyed am metric ballscrew (RM1605 means 16mm Diameter 5mm pitch),
but want to use imperial Units.
so we have to do some calcs.
we microstepping 1600 steps per motorrevolution -> 5mm
so steps/per (motortuning) is: 25.4/5*1600 = 8128
for a test use:
velocity 60
acceleration 12
and make sure Config ->Select Native Unit is set to Inches (if you have to Change, restart Mach3)
@reuelt, do you have a Magic glas ball ?