[Shop-talk] drilling a square hole

[hillman at planet-torque.com (David Hillman)]

On Tue, 18 Oct 2011, john niolon wrote:
> TOOL HEADS !!! (it's like a gear head but with tools) PAY ATTENTION. how many
> times have you needed a square hole and had to drill it out and then work with
> a file to square it up..... the Japanese (those crafty bastards) have solved
> your problem...this is just too dang cool (and expensive probably)
> http://gizmodo.com/5849810/how-the-hell-can-this-magical-square-hole-drilling
> -machine-works

    It's actually based on a 1918 patent... an American one.  HJ Watts 
patent #1,241,176.

--
  David Hillman