Bob Headrick wrote:

"Alfred Green" wrote in message
news:UIh_f.345$zf6.180@fed1read08...
john graesser enscribed:

I seem to recall someone mentioning in the past that glass can be
drilled if
it was kept in a bath of kerosene, and drilled while submerged.

However, I don't see what the special attraction would be for using
Kerosene. Plain old water works just fine. Just make sure you use the
correct type of drill bit and a nice slow cutting speed.
Kerosene is not significantly more viscous than water, so if you want
to really damp things out I'd use a heavy grade lube oil, maybe a
20-50 grade motor oil.

My experience with Lexan is that oils and/or solvents will cause it to
become very brittle and crack at any machined edges, including drilled
holes.

The _easy_ way to drill glass is to use a piece of copper tubing with
hole-size for its OD, some powered carborundum as an abrasive, and
just enough water to keep it in a slurry. Use a drill press, low
RPMs, and light pressure.

--
Mike Andrews, W5EGO

Tired old sysadmin