Mike Dobony wrote:
"Chris Lewis" wrote...
If you're using a grinder, water is just fine. The idea is to
keep it cool.

You are no machinist. The water does more than keep it cool. It needs a
lubricant and the water does not do a very good job of lubrication. Oil or
coolant keeps the part from becoming brittle.

I can picture how cooling would prevent brittleness. I can't imagine how
lubrication could prevent brittleness.

--
Postulate a God who's so smart He designed things we won't discover for the
next ten years, but who's so incredibly stupid He couldn't think up the
theory of evolution. Duhhhhhhhh. "Damn, Darwin, what a great idea!"