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[–] thrus ago 

Pretty much any number of teeth will work the trick is to get them to move smoothly so there is minimal wear and thus minimal maintenance.

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[–] Amalek666_ 3 points -2 points (+1|-3) ago 

Look at this. Every shape of gear imaginable.

http://youtu.be/WYcqJ5HdxA4

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[–] carbanara ago 

Those were all squares though. The only difference was the bracing

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[–] Wuttier 0 points 1 point (+1|-0) ago 

Very intriguing. Are there any examples of working devices that utilize these types of gears?

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[–] Diogenes_The_Cynic ago 

I wonder if you can use them to make an interlock device.

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[–] ninjai ago 

All I can hear is "bomian happens". I figured out in the end happens = hairpins... But wtf is bomian?

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[–] NassTee 0 points 1 point (+1|-0) ago 

Borromean - it comes from the name of a family. https://en.wikipedia.org/wiki/Borromean_rings

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[–] the-gerbil-in-my-bum 0 points 3 points (+3|-0) ago 

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[–] zezzer [S] ago 

that's awesome! love how it sounds like Tom Hiddleston talking lol