Drilling #1: A Square hole drill?

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Blog entry by Dale J Struhar Sr posted 10-10-2011 05:49 AM 6074 reads 0 times favorited 7 comments Add to Favorites Watch
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Check this out. How to drill a square hole. What do you think folks?

-- Dale, Ohio

7 comments so far

View AttainableApex's profile


342 posts in 1920 days

#1 posted 10-10-2011 06:01 AM

wow that is truly crazy

-- Ben L

View A Slice of Wood Workshop's profile

A Slice of Wood Workshop

939 posts in 2260 days

#2 posted 10-10-2011 06:03 AM

That’s interesting.

-- Follow me on YouTube-

View David Grimes's profile

David Grimes

2078 posts in 1726 days

#3 posted 10-10-2011 06:08 AM

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

View pintodeluxe's profile


4185 posts in 1900 days

#4 posted 10-10-2011 07:22 AM

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

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

View lilredweldingrod's profile


2495 posts in 2194 days

#5 posted 10-10-2011 07:57 AM

Talk about a drill with a wobble. Very interesting.

View Damien Pollet's profile

Damien Pollet

73 posts in 1696 days

#6 posted 10-10-2011 09:56 PM

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:
But the broaching tool works like a chisel more than a drill or router bit, the wobble replacing taps from a mallet.

View kiefer's profile


4215 posts in 1754 days

#7 posted 10-11-2011 03:02 AM

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.


-- Kiefer 松

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