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Old 06-24-2012, 05:15 AM   #1
Oric
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Default Drilling square holes

http://www.ohgizmo.com/2009/10/07/sq...blows-my-mind/
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Old 06-24-2012, 07:31 AM   #2
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I remember a book from Martin Gardner in the 70s had a chapter about it

--------edit----------
http://mathworld.wolfram.com/ReuleauxTriangle.html
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Last edited by gsgs; 06-28-2012 at 04:00 AM.
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Old 06-24-2012, 05:23 PM   #3
Potemkin
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Looks like a cylinder in a Wankel Engine.

OK. The patent for the drill bits predates Wankel.

http://en.wikipedia.org/wiki/Wankel_Engine

It appears there are other Reuleaux polygons. http://en.wikipedia.org/wiki/Reuleaux_triangle

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Old 06-24-2012, 05:47 PM   #4
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Mesmorizing! As you can see I require very little to be entertained...
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