"Don Phillipson" wrote in message
...
What sort of circular saw blade should be used
to cut plexiglas (Lexan) of 1/8 inch thickness?
This is to make fixed windows, screwed flat to
the structure of a shed.

--
Don Phillipson
Carlsbad Springs
(Ottawa, Canada)


Lexan is a trade name for polycarbonate plastic. Plexiglas is a trade name
for acrylic plastic. Which do you have?

Assuming acrylic:
The best blade is a triple chip, alternating profile tooth with 80 carbide
teeth on a 10" blade. Rake should not exceed 5 Deg. These are typically a
special order item and cost around $100 or more.

Getting a Terry-Fletcher plastic scoring tool is better for smaller
projects. They cost around $6 and last long. Avoid those cheap plastic
cutters with the swing open blade. You can avoid any cutting work by asking
a hardware store or a picture framing business to cut it for you. They
likely have a machine to cut it for you.

I don't recommend screwing it to the window frame. plastic expands and
contracts with varying temperatures so it needs room to move. It is much
better to mount it in a channel system allowing 1/32" per foot for
expansion. Also, screws cause high stress points that detracts from the
material's high impact strength.
John