Rock tumbler

This was a 3rd grade "Invention Convention" project. The goal was to make a low-cost durable rock tumbler using 3D printed parts.

There are a number of parts included here and some additional materials required (motor, drive belt, plywood, machine screws and nuts, power supply, PVC pipe, 5/16-inch square steel, etc).

Use this to print parts which can be used to put something like this together. The original design used a small DC geared motor which was too weak, and we switched to using a variable-speed drill motor (14.4V) with a rotary actuator for the speed control. Otherwise the amount of starting current is too great for a basic power supply.

See assembly instructions for details on materials used.