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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.
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Comments
Its just a wobble broach...
i think you mean Reuleaux triangles: http://upper.us.edu/faculty/smith/reuleaux.htm
Better tool and video for boring a square hole:
http://www.youtube.com/watch?v=KUeQugasOkk
More commonly called a broach.
http://www.youtube.com/watch?v=zZpWcl1BKVk
looks like a wankel engine to me
As a former machinist/operator it does blow your mind, even after you've been doing them all day.