Stepper Motor Details
The left side of the base has the bearing which is connected to the stepper motor. The stepper motor is from a junked copying machine, in this case. It drives the bearing on the left side that, in turn, drives the table. The motor is geared down by using the actual gearing that was in the copier. The gearing is not critical as speed is controlled through the circuit. Torque is effected by the gearing, however. The setup here is about a 10:1 gear reduction.
Copying machines are great sources for a variety of parts. The lens from this junked copier was used for the alignment finder.