On Sun, 26 Apr 2015 21:18:02 +0000, MATHSMAN
wrote:

I need to cut a square hole through a stainless bolt, using it as a lathe
tool holder.I have drilled bolt no problem with Cobalt drills. Is it now
down to a lot of work with taper files or can I BROACH IT?

I have the perfect tool for that, a square drill, but you're using the
wrong material. http://tinyurl.com/k45cujk

--
"I believe there are more instances of the abridgment of the freedom
of the people by gradual and silent encroachments of those in power
than by violent and sudden usurpations."
--James Madison, Virginia Convention, June 16, 1788