Automatic Pool Cue
The automatic pool cue was developed through several design iterations aimed at balancing space efficiency, torque generation, and ergonomics. The goal was to create a compact, self-contained cue that could replicate the motion of a professional pool shot while remaining comfortable to handle and operate at a standard pool table.
A major design challenge was generating sufficient torque and linear force within a very limited internal volume. I experimented with multiple drive configurations before finalizing a 1:2 chain drive system that coupled a DC motor to a gear train and rack-and-pinion mechanism, converting rotational motion into a smooth, linear draw of the cue. This setup provided the necessary pulling force without exceeding the cue’s length or weight limits. The system was paired with a latch mechanism that allowed the cue to be released at any point during the drawback, letting the user control shot power and timing.
To ensure tight packaging, I relied on rapid prototyping to test each mechanical subsystem. I 3D printed components in PLA to verify clearances and sliding interfaces, particularly around the cue guide rails and sprocket axle bearings. Maintaining consistent tolerances in these areas was essential for smooth motion and reliable energy transfer. Every design iteration focused on optimizing fit, minimizing friction, and simplifying internal geometry to streamline assembly and improve mechanical response.
Once the design was finalized, I fabricated all major components using CNC milling, lathe work, and 3D printing, combining metal and polymer parts for strength and precision where needed. The frame and motion components were machined to maintain alignment under load, while the enclosure and non-structural parts were 3D printed to reduce weight and simplify fabrication.
The system is powered by a rechargeable battery and operated through a directional switch, allowing users to easily control the draw and release of the cue. I conducted iterative testing to refine the timing and torque output of the drive system, ensuring consistent performance and user safety. The final prototype produced a smooth and adjustable shot, showing that the small motorized mechanism could control the cue reliably.
