I have always thought. a "Servo' brand power feeder would be the logical starting point for such a conversion. Often used as a power table feeder on a bridgeport type milling machine. You have to figure out how to attach the drive gear to the crank shaft.
As I understand them the gear drops out of engagement when the motor is not turning. this allows hand cranking with the power off for fine tuning.
Grizzly sells their own version.
Bill D.
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