Ignoramus30138 wrote:
On 2010-12-17, Lloyd E. Sponenburgh lloydspinsidemindspring.com wrote:
"Pete C." fired this volley in news:4d0be94a$0$9804

And remember, you *do not* need coolant for most machining operations in
aluminum.

But you need _lubrication_, or you get false edges built up on the
tooling.

All the more reason to use a polymer for the backer instead of wood.

I have never succeeded machining aluminum without coolant. Broke a few
endmills.

Coolant, or lubricant? They're not necessarily the same, although I'd assume
your coolant has some lubricity.

I've used plain, ol' ordinary lard (Crisco will also work) on aluminum; it
works good and smells good too! ;-)

Cheers!
Rich