[VThokieME04]

In 2005, Team 401 powered a turret by drilling holes on the top of a circular disc at a fixed distance apart. The distance between holes matched the pitch between the teeth of a sprocket (used normally to drive chain). The sprocket was set perpendicular to the disc and driven with a motor. It was kind of a poor man's gear and worked great. The best part is, you can make it with just a drill press, although a jig to help you make a consistent set of holes helped a lot. Just make sure you do your math correct and end up with an whole number of holes comprising your circle. Definitely measure three times, drill once.