Metronome Engine

Metronome Engine.
I wanted to build a test rig to check some calculations I made to determine the dimensions for a compound pendulum , these had been done in Excel and were intended for a new wooden clock design I was working on. I had based the rig design on the engine used in a metronome. It's the only mechanism that I could find that actually used the compound pendulum so it turned out to be ideal for 3D printing. The rig is driven by a weight inside the steam engine style boiler on the end of a stalk, it drives an escape wheel through a gravity ratchet and a couple of gears to give around 2.5 minutes of running time. The compound pendulum controls the rate at which it tick-tocks. Moving the top weight up slows down the pendulum and visa verse. The top and bottom weights can also be changed out for bigger or smaller weights to also change the rate. With all these possible variations it was straight forward to finesse the results to get the right combination that could be scaled u