Not metalworking but just for fun I made a computerized Etch A Sketch using a custom 16f628/L293 driver board that I had laying around. The Stepper motors are from old 5.25" floppy disk drives. These are very low torque motors so I cnc'd some 1.8:1 gears out of baltic birch ply using our servo driven gantry router. The gears increase the torque enough to run 50ipm rapids. The stepper motor driver board uses parallel port step/direction input from a old laptop driven by TurboCNC. Heres the code software (.hex) to convert step/direction to drive the stepper motors. We have some motor driver bare pcb boards still available, email us if interested.