View Single Post
Old 01-25-2009, 01:30 PM
Creative Engineering Creative Engineering is offline
Join Date: Sep 2008
Location: Clearwater, FL
Posts: 1,668
Default Re: milling question

Originally Posted by junkyard View Post
for the machinists out there....well jim and ret

can you mill a square tapered hole to fit onto a 3piece bottom bracket?
It's called a broach. You drill a hole first, and then use an arbor press to push a broach into the hole. The broach shaves the metal out of the corners. This is also how straight key slots are cut.

It could also be done with a wire EDM, but it would be expensive.

The milling machine will always leave a radius in the corners.

Reply With Quote