On Fri, 03 Sep 2010 13:58:33 -0500, Karl Townsend
wrote:

On Fri, 03 Sep 2010 12:20:18 -0500, Ignoramus24760
wrote:

I have a little project where I want to mill some holes and slots in
1/8" Lexan (polycarbonate).

What is the best way to do it. Really fast feeds, medium speeds, and
lots of coolant?

i
Make a sandwich is the key, AL on top and below. Then speeds and
feeds for AL. HSS works better here.

Karl

i just read the rest of your thread...

I didn't mention I run this dry. The AL does two things - holds the
Lexan firm for no chipping top and bottom, and its a great heat sink
so you don't get any melting.

karl