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This is #35 from "Five Hundred and Seven Mechanical Movements" by Henry T. Brown.
Creating proper elliptic gears is quite sophisticated. I did something like a workaround: I created two gears, sliced and merged them into one. It works fine, but I would not build it into a real gearbox because of the poor efficiency.
You will need a screw M6 by 10mm for fixing the small Gear.
If you scale down
And finally you need a rubber band for the Wedge and Base.
Preview in SketchFab:
Elliptic Gear by enhydra is licensed under the Creative Commons - Attribution - Share Alike license.
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