On Thu, 29 Sep 2005 16:03:16 -0700, "Brad Smallridge"
wrote:

I have a lathe and milling machine and would like to
make my own parts for servo motors horns, wheels,
or take up spools. But how does one go about
machining that serrated interior hole? Is there some
sort of broach I can get for it?

Brad Smallridge
aivision.com

The below group has a lot of metal maching types of questions and
answers.

rec.crafts.metalworking