bike o graph Bike Part Spirograph

Spotted at the recent Cedar Rapids Mini Maker Faire by Steve Hoefer. Looks like a piece of hardboard with a circular hole in it, lined with bike chain, to make an improvised “ring gear,” with variously-drilled chain gears and sprockets that roll around inside it to guide the pens. A similar idea was published by Instructables user hunrichs back in 2008, but I don’t think this is the same maker, and I don’t think Steve managed to get his or her name. Can somebody help us out? Who made this?

Mini Maker Faires Are Just as Great as Full Maker Faires

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Sean Michael Ragan

I am descended from 5,000 generations of tool-using primates. Also, I went to college and stuff. I am a long-time contributor to MAKE magazine and makezine.com. My work has also appeared in ReadyMade, c’t – Magazin für Computertechnik, and The Wall Street Journal.


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