ger21:
Sorry, not my native language. I don't know the difference between accuracy and precision.
I thought both to be the deviation between the intended and the actual position. And the resolution to be the minimum difference between 2 points that can be represented. Please help improve my english vocabulary.
I don't fully agree with your view on microstepping. If the current levels of all the microsteps are well matched with the motor and it's detent forces, each microstep will have a resting point proportionally spaced within a step to it's microstep number. And the compliance will be largely the same as more than one winding will carry current except for the steps corresponding to full steps. The reason i say "fully" is that in real life microstep currents are not well chosen, and almost never consider the detent forces. With my drives quarter stepping is so close to perfect I cannot measure the error with a dial indicator, while 1:20 stepping is no better except for more quiet running. The last 4 steps before going to zero current does not overcome the stick slip then the 5'th goes to where it should be.
I think there was a thread on using a laser pointer secured to the shaft to measure the movements of microsteps. That's a bright idea.
