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I've just finished my stepper-motor focuser project.
Two electronic kits, a stepper motor controller and 4digit up/down counter - fitted into a jaycar box, with cables and switches. Unfortunately just the stepper motor didn't have enough torque to be reliable on it's own - so a planetary gearbox got added to the set at 1:25. This makes it 5 steps to the 0.001" focuser travel which is well below the bounds of accuracy with my R&P focuser. Mounting shown here is still in the final R&D configuration. Obviously the focus position numbers are different depending on whether you are focusing on the way "up" or "down", but this is quite reproducible and so doesn't cause much of a problem.
My original intent was to retain the ability to manually focus by turning the "motor off" and "motor on" - but with the gear box that now makes it impossible.
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