Looney Gears

by Oskar_van_Deventer
  • White

    White nylon plastic polished to reveal a smooth matte finish.

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Looney Gears is a strange eccentric planetary gearing system. Whereas normal planetary gear systems are symmetrical, this one has no symmetry whatsoever.

This particular set of gears was the result of a challenge by Oskar to Andreas Röver in 2006. Andreas found this nice set of all-primary-numbers gears which is about 0.01% exact.

When Oskar made the Looney Gears, he made the conjecture that there do not exist exact solutions for this type of eccentric planetary gear systems. After seeing Oskar's video of Looney Gears, Bill Somsky proved that there are actually huge numbers of exact solutions for Looney Gears. These exact solutions are now called "Somsky gears". Somsky's discovery and proof showed that Oskar's conjecture (that there are no exact solutions) is wrong.

Watch the YouTube video of Looney Gears.
Watch the YouTube video of the Somsky Gears.
Watch the animation.
Read at the Shapeways Forum.
Read more at the Non-Twisty Puzzles Forum.

Please contact Oskar directly if you are interested in obtaining a fully colored and assembled sample of this puzzling object.


IN: 3.543 w x 1.969 d x 4.528 h
CM: 9 w x 5 d x 11.5 h


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@Oskar_van_Deventer Well at $106.46, it is getting pretty pricy. Was there any way to make it smaller so that it could use less material? Oh and I got your sixth sense ring. I'm currently waiting for it to come in the mail, I can't wait.
November 14, 2013, 12:18 pm
@maxwil7 Thank for the compliment. It was a fun project. Very uncool to blame the inventor for the cost of 3D printing.
November 14, 2013, 12:09 pm
very cool concept. these gears boggle my mind to no end. very uncool price for three gears
November 14, 2013, 1:36 am


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