Joseph Gwinn wrote:

Joe, I have my chip shield made from polycarbonate. It sees plenty of
oil, but does not seem to craze?

Hmm. Good point. The chip shield on my lathe is none the worse for wear
either.

I may be mixing polycarb up with acrylic. Unless the heat of machining allows
the oil to get deeper into the material.

I did a little looking:
http://www.practicalmachinist.com/vb...arbonate-19645
9/.

It is the acrylic that is so oil sensitive. But still, water is the best
coolant.


Joe Gwinn


Lexan is the one that will craze like crazy.


--

Richard Lamb