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« on: February 20, 2010, 06:04:31 PM »
Still sounds a very strange number for the pitch if they are metric screws, do you have a link to them from the place you purchased them?
Ok assuming they are 1.666666666666....mm pitch I would suggest you use 1/8 stepping so that would mean to turn your motor 1 revolution you would need 1,600 steps, one rev of the motor would move 1.6666666mm so for 1mm you would need 1600/ 1.66666666 = 960 steps per mm
Your Velocity looks slow but keep it that for now but your acceleration is likely way to high so set it down to about 50 for now and see how you get on.
Hood