In article ,
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?

Clean all the oil from the tools and fixtures, as polycarb will craze form oil.
(Do not use emulsion coolant either.)

Use lots straight tap water as a coolant. Go as fast as you can without the
polycarb softening from the heat.

Polycarb can be a bit grabby.

Joe Gwinn