Automatic Pool Cue

The final product was the result of several prototypes and iterations. I had to carefully balance tight space constraints with the need to generate enough torque for the pool cue mechanism to function effectively, all while keeping the overall size compact enough for comfortable use at a pool table.

I used rapid prototyping to test-fit each component by quickly 3D printing them in PLA, carefully monitoring tolerances throughout the process. Beyond ensuring a solid enclosure, I also had to maintain precise tolerances for critical sliding interfaces, such as the cue and sprocket axle bearings.

In this project, I used a combination of mills, lathes, 3D printers, and various hand tools to fabricate and assemble all the components. The main motion system consists of a motor driving a 1:2 chain drive, which then connects to a gear train and a rack-and-pinion mechanism that pulls the cue back.

The pool cue featured a latch mechanism that allowed it to be released at any point during its drawback, giving the user control over the power of each shot. The entire system was operated using a directional switch connected to a rechargeable battery, making it simple, reusable, and portable to use.