I have made a motorized stop motion dolly. I finally found a very slow electric motor. It rotates at 3.5 revolutions per minute. I cobbled together the track, dolly and gear box from previous projects and added the motor with a speed control. The speed control allows me to slow the motor even more. The motor rotates a gear that winds up a string on an axle. This string pulls the dolly along the track at a very slow speed. I placed the track at a slight incline to put the string in tension.
