I'm looking to drive a 10mm pitch ballscrew directly with my 750w servo motor, which is run as a stepper. I have two of these to drive my x and y axes on my mill conversion. For stepping I have options of 200, 400, 500, 1000 steps per rev and 10x microstepping. Clearly, 10k microsteps gives a resolution of 0.001mm per step which is miles finer than this old chinese mill can manage anyway, but it does sound nice and smooth when travelling slow whereas 2000 step/rev which gives me a resolution of 0.01mm/step seems more sensible and gives me faster rapids but it hums quite loudly when moving at slow speeds.
What would you do in my situation?