Man, I gotta get one of these!!

http://mikesenese.com/DOIT/2011/10/drilling-square-holes-with-a-reuleaux-triangle/

I would like to SEE this in action, not as cartoon on a computer. Take note of the tool shaft moving about which would mean the drill would move about. The guide seems to be the key to the process, keeping the cutting tool in position. And just what keeps the guide from being damaged by the cutting edges of the tool?

I have heard you can do something similar by not chucking a drill bit on axis and having it flop around a bit in the hole. Again when I ask to SEE it in action, they did a little sidestep and moved on. Not saying it could not happen, just want to SEE it happen.

Not only possible but Weyger `s book The Complete Modren Blacksmith has complete directions on how to do it.Now we need someone to do it and post it !!!

Looks similar to the rotary broach for hexagonal holes. The square hole would require even more strength and stability for the bit though.

The Watts square hole drill bit has been around since 1918! I wonder why they don't sell them at HF by now, you would think that we would all have a set in our tool boxes

What page is that on in the Weygers book?

As a blacksmith though I have the FAR cheaper and simpler (also much more versatile) option of punching and drifting to get my square holes! I'd not be anxious to own one of these even if it were free!

That would be page 219 .

Here's rotary broaching. Square, hex, whatever:

The Watts square hole drill was what I thought I was going to see in the first video and broaching is a different operation in either case.

What really impresses me though is that Grant named his vise Kurt. Now I REALLY want a tour of his operation! (Shop that is!)

Frosty the Lucky.

Another Watts drill video:

I can understand how the cutting action works but, how is hole orientation established? By that i mean in this case the edges of the square holes parallel with the vise jaws. I would think it would be random upon the start of contact of the bit???

The orientation is set by the square guide.