I think this might be a tough project. Assuming you could find the appropriate motor and bracket you could mount a motor on top of the table, and use either a belt or direct drive, or mount a motor under the table and use a belt drive.
Take a look at the motor in this thread, and the link Ourworkbench included on this Hamilton Beach motor.
White Rotary with reversible motor
I am seeing motors like this on ebay, and if it has the base, as pictured in the old advertisement Janey found, it might just set right on the table top and work as a direct drive. The motor is reversible so you would be able to get it to turn in the needed direction.