Thread: Square Hole Drilling

Has anybody ever seen a corner mill in action?

I've seen tons of links to the same video...

Six-Pack o

and I'm curious if the toolholder and tooling has been made available yet in the US. I have a bunch of blind square holes to machine, and I'd love to find something faster and cheaper than a sinker EDM. This tool looks like just the ticket, although I can't find a source that can sell one.

Stu

I have never used them myself but have heard of them and seen many video. It's called wobble broaching or rotary broaching. Here is a link for a distributor here in the states.

Rotary Broaching Tools

That's not rotary broaching.

This is what you are looking for.

watts drill

that is amazing! gonna hafta try that

the Japanese got it right.drill SQUARE HOLES Japanese form tool - YouTube

Yes, that's what I'm looking for, and where can I buy the tool and holder? Surely soembody in the US must be importing them...

I don't know where to get one but here's a link the 1956 popular mechanics article about building one:
Popular Science - Google Books

You would have to adapt the design a little to work in a mill.

For square and hexagonal holes see:


http://www.google.com/url?sa=t&rct=j...Gw5s8Q&cad=rja

This apparatus is known at least since 1960+.

ya these things are around
worked ata a place
hey put a hex in the end of this
like are u nuts
it was on a lathe
some kinda wobble deal
a 5 sided cutter
as you feed it into a drilled hole
and i be dammed
a 6 sided hole
it was way cool
sorry i cant help with info
other than ya they are here
and been for years