Core77

Using geometry to drill non-round holes

By Rain Noe - March 9, 2011

in Tech

I came across this video of someone using a rotating tool to drill a square hole:

How the heck did they do it?Using a geometric phenomenon known as Reuleaux Triangles. I tried reading several explanations of these before stumbling across video of them in action:

Turns out you can also drill hexagonal holes:

I think my brain just broke.

o

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Nerdspeed

13 years ago

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As a former machinist/operator it does blow your mind, even after you've been doing them all day.
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frank

13 years ago

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looks like a wankel engine to me
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Ken J

13 years ago

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More commonly called a broach.

http://www.youtube.com/watch?v=zZpWcl1BKVk
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Marc G

13 years ago

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Better tool and video for boring a square hole:
http://www.youtube.com/watch?v=KUeQugasOkk

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emil tin

13 years ago

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i think you mean Reuleaux triangles: http://upper.us.edu/faculty/smith/reuleaux.htm

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J

13 years ago

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Its just a wobble broach...
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