Have a weight moving around in circular motion inside the device. What are the qualities and particularities of having a center-of-mass moving in circular motion, versus in linear motion.

Steel nuts are attached to an rotating arm. The rotation speed is controlled by a small DC motor. No position control, only speed and direction.

In this iteration, I am testing a wheel-encoder to add position control to the setup. This way I can precisely rotate the ballast is a specific direction, i.e. like a weighted-compass.

The motor has been moved to a flat configuration to obtain a slimmer device. Gears have been added to move the rotating plate. The ballast can be modified by reconfiguring the dead-weights.