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Question for the stepper motor experts
Looking at stepper motor drivers I see that micro-stepping can be set from 200 up to 40,000 steps for 1 revolution of the stepper, one would have to assume that increasing the number of steps per rev would increase positional accuracy, I have also read that it can make stepper operation smoother, but there has to be a limit where a trade off situation is reached where speed, torque or some other aspects of the performance start to suffer. A small table below shows the effect of steps per rev on accuracy for given an arbitary axis move of 15.53mm (not real high precision), assuming a standard 5mm pitch ballscrew. In each case the number of steps needed to move that distance (15.53mm) is not an exact number but includes a partial step which is of course in the real world is not possible, the actual distance moved is given to 4 dec points
Micro step --------------------------------------Actual distance the axis moves.
200----------------------------------------------------------15.525
800 ---------------------------------------------------------15.525
1600--------------------------------------------------------15.5281
3200--------------------------------------------------------15.5296
6400--------------------------------------------------------15.5296
12800-------------------------------------------------------15.5296
25600-------------------------------------------------------15.5298
What is the practical limit for microstepping - from the table it looks as if it is not worth going beyond 3200 or even 1600 micro steps per rev
Attachment 399771