We may receive a commission when you use our affiliate links. However, this does not impact our recommendations. https://media.popularwoodworking.com/app/uploads/2026/05/25210322/vid_20251012_161924-1.mp4 In the first installment of this series , we covered the physical geometry of the vessel—taking a raw, rustic tree branch and hollowing it out to create a vaulted pedestal box. Today, we step inside that wooden vault to design the mechanical heart of the automaton. Our goal here is to keep the engineering incredibly accessible for students and hobbyists alike, relying on a simple friction-drive system to turn manual hand rotation into playful, organic movement. Anatomy of the Movement Before we look at the different configurations, let’s re-establish the common vocabulary for the three key components that make up this friction drive: The Driving Wheel: The vertical wheel fixed directly to the main horizontal axle. When you turn the exterior handle, this wheel rotates and drives the entire system.…