Magic Gears

by Oskar_van_Deventer
Magic Gears 3d printed Art Accessories Magic Gears all rotating anti-clockwise
Magic Gears all rotating anti-clockwise
  • White

    White nylon plastic polished to reveal a smooth matte finish.

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Magic Gears is a paradoxical set of three identical gears that can both mesh in the regular way and all in the same direction. It was inspired by this YouTube video by Jacques Maurel. Maurel writes: "The paradoxical 2 teeth gear set is used in the 'Mercier differential' (using the torque transfer technology) Patented in 1988 by Renault". Oskar's addition to the work is making Chevron Gears as invented by Andre Citroen. This way the three gears become identical and they can both mesh classically and paradoxically.

I have performed this Magic Gears "trick" to several friends, family and colleagues. I get two types of reactions: "wow" and "so what". Apparently, there exist people who are not aware how gears are supposed to mesh :-).

Watch the YouTube video.
Read at the Shapeways Forum.
Read more at the Non-Twisty Puzzles Forum.

The set is delivered as a DIY kit. You will have to add five M3x60 bolts yourself.


IN: 4.004 w x 1.181 d x 2.283 h
CM: 10.17 w x 3 d x 5.8 h


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The video shows how two such gears *can* move in the same direction, but says nothing about how one imparts torque to the other. Fortunately this is reasonably obvious from the helix shape.
April 28, 2012, 7:09 pm
What is the shaft size for the magic gears stand? Thanks Saul Bobroff
April 21, 2012, 1:57 pm


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