Drilling #1: A Square hole drill?

wow that is truly crazy

-- Ben L

That’s interesting.

-- Tim- http://www.asliceofwoodworkshop.com; Twitter-@asliceofwood; Facebook-http://www.facebook.com/asliceofwood

Very nice engineering and tooling, for sure. But, it will not work in a regular drill press, lathe or milling machine (or anything else) without a precisely cam’d offset above the chuck. Likely a different one for each size square, too.

The geometry is sort of like how the eccentric shaft of a rotary engine slings the rotor in a triangle shape… only this is set up for four sides instead of three.

-- If you're going to stir the pot, think BIG spoon or SMALL boat paddle. David Grimes, Georgia

1+ David, reminds me of my rotary powered mazda!

-- Willie, Washington "If You Choose Not To Decide, You Still Have Made a Choice" - Rush

Talk about a drill with a wobble. Very interesting.

It’s possible to turn polygons, with a rotating cutter; it has to be precisely synchronized to the blank though, depending on how many faces you want, how many edges it has, and the relative diameters (I don’t remember exactly, my machining courses are quite a few years old).

There’s also a technique called “broaching”, described here: http://www.youtube.com/watch?v=zZpWcl1BKVk
But the broaching tool works like a chisel more than a drill or router bit, the wobble replacing taps from a mallet.

Dale that is very interesting and done before ,look at videos on YOU TUBE
I did a post some time ago on a dovetail drill bit which I invented and like you to look at it .
I think it will be of interest to you.
http://lumberjocks.com/projects/44310

Kiefer

-- Kiefer 松