Thanks for your reply.
I'm a little green when it comes to designing a micro milling machine (think really finely detailed waxes and engravings with a cutting area of at most 4X4X4" xyz)
I just thought that by going with a native motor that can do 0.45 degree steps (it was designed to do this), that the performance and accuracy will be better than a 1.9 degree motor driven with a 1/2 step. I was under the impression that stepping modifies the signal, and depending on the quality of the step driver circuitry, may not be so accurate.
So the chain goes like this:
Mach3 -> Galli controller card -> microstepping driver -> stepper motor
I'm still hoping someone will help me understand how I can change the microstepping on the fly - is it through Mach3, a dip switch on the microstepping driver, a feedback loop from the microstepping driver to the Galli card, or what?
?
Doesn't seem practical to build an entire workpiece at 1/64 step from start to finish.... I'd like to think I can remove some bulk material faster initially at 1/2 step then do the finer detail in the last stages of cutting. Anyone?
thanks