Thanks Dave and Kirk for your suggestions, they are food for thought. The little motor I have will be powerful enough for the time being and runs at 10,000rpm - almost all the milling I do is with cutters of 3/16 and under - mostly 1mm or less. I won't be using the motor as the spindle - I have a nice ball-raced spindle that I made with preloaded races, and so I will be belt driving it at almost 1:1 ratio. I did think I had seen a reference to just hooking the parallel port to a FET but I couldn't locate the reference again and I am a bit hesitant about getting high power so close to the parallel port. I will probably try an H-bridge of FETs or power transistors with some buffering between that and the parallel port. Has anyone figured out how to output forward and reverse PWM signals yet or a PWM signal with two other pins giving a forward and reverse signal? I noticed one post mentioning PDM - what's that? Thanks, Ian
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