Quote:
Originally Posted by Astroman
Okay thanks for the info, may give it a test, when I can.. I haven't got the moonlite motor yet but if the driver works it would be good to match them up. Not sure on the USB driver chip. I have had this thing working on a bipolar stepper with out trouble, but the resolution is way too course for a focuser, thats why my thoughts turned to the Moonlite hires stepper.
Andrew.
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The documentation goes through how to work out how many steps you actually need. I'm using the recommended hardware, which provides more than enough resolution for me with full steps. Plus you can use partial steps with the DRV8835 stepper driver to gain more steps if you want. I've had mine stepping on the bench well at 1/8th steps.
I've got the Nema 17 with PG27 gearbox, which provides approx 5400 steps per revolution with full steps. Seems typical to run it at half steps (so over 10000 steps per revolution). Plus as I said I've had it doing 1/8th steps, but I'm not sure how reliable it would be or how much torque.