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Drilling a square hole...not impossible.

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Boyd

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Dec 16, 2009
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Forney, TX
At the one minute mark they slow the video down and show the bit working close up.
 

Thruxton

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Dec 30, 2010
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Virginia
Try a search on "Harry Watt square drill bit" - this idea has been around for a VERY long time.
 
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busted knuckle

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Mar 15, 2007
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Mason, Ohio
It's an attachment and three point end mill. That was the first thing I was shown how to do when I started in the Machinist trade back in 1972.
 

SuperSocket

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Nov 2, 2010
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Michigan
This is an American idea developed by Harry Watt, who is based out of Wilmerding, Pennsylvania, USA. They were known as the Watt brothers.


They based their drill design on the Reuleaux triangle which was discovered by Franz Reuleaux of Germany.



Chinese just copied it... as usual.
 

AussieDan

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Sep 18, 2008
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298
Location
Syracuse, NY
How do you figure? If you just spin a 3-point bit you'll end up with a circular hole. The magic is in how the rotation of the bit is synchronized with the circular movement of the entire bit.
 

justanengineer

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Apr 5, 2011
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7,722
Location
Motor City
The link didnt work for me either, but Im familiar with Harry Watt's work. If I need to put strange internal shapes into material with sharp corners, Ive got a small shaper, and want either a larger one or a planer.
 

coldfusion21

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Jul 7, 2005
Messages
404
Location
portland, oregon
Look up a rotary broach. Can make all sorts of shapes on a regular (CNC) lathe.

It's how a shop I used to work for would cut internal hex's into hydraulic parts. Pretty neat
 

rodm1

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Feb 17, 2008
Messages
2,270
Thanks that is the best video I've seen on this. They are known to cut tapered holes not good for high accuracy work.
 

Nova_Guy

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Sep 18, 2011
Messages
120
Location
Near Dayton, Ohio
This drill square holes. Its in a Ripleys Believe it or Not Museum. It uses a couple of different cutter bits. The sign with said it cut many different shapes including a star shape in just about any material. The cutter bits could be swapped or moved around using different holders.
2006_0621_023945AA.jpg

2006_0621_023937AA.jpg
 
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