Mechanical Drum Machine
thingiverse
<iframe width="480" height="640" src="https://www.youtube.com/embed/vzB5J0jIU6s" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe> Works a bit like a music box. The 4 'cogs' have double-octagons for their holes. This allows printing, swapping and rotating the cogs to place on to the octagonal shaft to adjust the beat by whole/half steps. The 'drum set' I made kinda sucks and everything sounds the same to me (I'm very deaf). But I wanted to make this fun and fun was had. I'm content. Requires some 3/16" rod. Crank requires printing with support. The rest of the parts do not.
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