Andy Pugh wrote: > 2009/7/5 Jeffrey Pease <jpe...@peasej.com>: > > >> One mysterious issue I've seen that I'm trying to figure out is that >> very, very rarely, a movement command to the milling machine will make >> an axis move the correct distance in the INCORRECT direction. >> > > Is there any possibility that this is a mechanical problem with the > motors? I am wondering if they can get into some form or resonance > when pushing the step rate too far, such that they start stepping > backwards? > It is ABSOLUTELY possible for stepper motors to run backwards if the accel is set too high, or if there is a resonance problem. If you set accel very low, and do a jog, it will ramp the speed up very slowly. Listen to the motor. If it makes a rattle at a specific speed, that is resonance. If you are not using a microstepping drive, then I have a STRONG feeling this could be a resonance problem.
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