[gnea/grbl-Mega Issue#76] Losing Steps, Pulse Width>?

#1 – cprezzi 于 2019-02-19

@Ritzy22 You cannot expect to get more precision with microstepping! Only full stepps are defined positions, all microstepps are only somewhere between the full stepps, but not repeatable.

#2 – 109JB 于 2019-02-19

In real life, microstepping does increase precision and microsteps ARE repeatable. A 1/16th microstep may not be exactly 1/16 of a full step, but definitely is repeatable. Also, 1/2 steps are exactly 1/2 of a full step.

While increasing the microstepping may not technically be “exact”, a 1/16 microstep will be somewhere between 0/16 and 2/16, and 2/16 will be somewhere between 1/16 and 3/16 and so on. So while you cannot say that they are “exact” positions, they are definitely an improvement over no microstepping.

#3 – easytarget 于 2019-02-19

More importantly; the question being asked mentions micro-stepping, but I’m not sure how repeating old adages about how micro-steps are not real steps added to the discussion. OTOH; I’m guessing this is a lead-screw z drive, so maxing out the microstepping should not be a priority for the OP.

I am curious why you are lowering the pulse width so far @Ritzy22 ? the default is 10 microseconds and seems to work for most, Even at very high feedrates I’ve never found it a limit.