Nema-11 tests well
Nema-11 stepper motor arrived today. Testing, it is a little better than expected. The maximum reliable speed with an A4988 controller that I could get was 10 revs per second, ie 600 rpm. That does represent fast step changes because each rev is 200 steps. It is therefore working with pulses as short as 250 microseconds for the high pulse and 500 microseconds for the repeating cycle. As predicted it will need a sleeve to increase the shaft diameter to 10mm. It would then run a 624 microsecond cycle for 27 steps to move the film 4.2mm in 1/60 second.
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