Calculations needed for spur gear drive

Tom Gideon

I'd like to configure a system for (ok...) a Criterion 4000. It's been refurbished and the optics are actually good. The main gear is a 217 tooth 48P gear being driven by a 13 tooth gear attached to a .75 RPH motor. I had to replace the motor with a 220VAC unit and I'd just as soon do away it.
I've been trying to figure out what stepper motor configuration would work and I'm stuck. Any help would be appreciated!

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