how to drill a square hole

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dnalot

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I thought some of you might like this

Mark T

[ame]http://www.youtube.com/watch?v=L5AzbDJ7KYI[/ame]
 
I saw a square hole being drilled in another video, but the video did not explain how it actually works like this one did. Thanks for posting! Very interesting engineering indeed.
 
lol my Thai staff are perfectionist's at drilling anything other than a round hole.
 
Somewhere in the British TV series QI there is a demonstration of the actual cutting process. Maybe moya034 this is where you saw it.

Q-uite I-nteresting stuff - the last one that was repeated was 'putting a square block into a round hole'

Probably Mensa candidates?
 
Yes they do look very similar to the Wankel but they are quite different.
 
wow thats pretty cool and i bet a pain to make that cutter :cool:
 
First patented by Harry Watts in 1914. Still sold by the Watts Brothers Tool Works in Wilmerding, Pennsylvania. You might see the http://www.drill-service.co.uk/ They have (at least had...) a polygon hole drills, the drill has one less flute than the number of sides to the polygon. The drills are quite expensive, and not very deep. But a mortiser (woodworking!) or a broach is not cheap either.
See also http://www.drill-service.co.uk/images_Technical/Watts.pdf
 
Last place I worked I spent days drilling hexagonal hole 6" deep in 4140 cast. Flat bottom too. Interesting tool until the 2nd day.
 

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