Any ideas on what would be the best way to cut a few sheets of polycarb?

Steve
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Steven Martin
Twisted Constructions
http://www.botbitz.com

A large table saw would be the best option, but in case you don't have access to one a hand-held circular saw should also work fine( I'm not exactly sure what type of blade would be the best to use)

Is it 3mm polycarbonate?

If the sheets are in Sydney, bring them over to my table saw. For smaller pieces of polycarb, I use a jigsaw on the lowest speed and with a large tooth blade to keep the heat down.
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Australian 2015 Featherweight champion
UK 2016 Gladiator champion

I cut a hole in a table I got for free off gumtree and mounted the jigsaw upside down in it. Used a good jigsaw blade that said it was for plastics and it worked bloody beautiful.