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nervous about cutting my plexi...advice? (yes i have searched)

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hulkster:
okay, i had to buy a large sheet of plexi because my cp is 49" wide (showcase cab) and so i have a sheet of plexi thats about 36" x 72".  i went out and bought a new blade for my jigsaw....its one with lots of blades on it (there was a post a while back about drilling plexi, and i was under the impression, that the more blades (teeth or whatever) that you have on your blade, then the better)....anyway, i got that new blade, and im worried about the whole cracking the plexi thing.  ive heard that you need to get two pieces of wood and sandwhich the plexi between them, but thats mainly for drilling the holes, which i understand.  but the actually cutting out the shape of the plexi....since my sheet is so big, where should i lay this thing so it wont crack?  i mean, do i need to get pieces of wood and sandwhich that even when i cut the outline?  i just dont want to crack it...so whats the best way to do this???  

paigeoliver:
I really don't think you can cut plexiglass with a jigsaw.

I usually cut mine by hand with a razor blade.

hulkster:
whoa, with a razor blade????  as in box cutter/exacto knife???  i have one of those, but didnt think that would work.  how long did that take you to cut?  my cp is like 21" x 49" or something close to that

TalkingOctopus:
I wouldn't cut it with a jig saw either.  I think that it would probably crack.  However, you could try a practice cut on a scrap piece to make sure.  I cut my lexan with a circular saw.  When I tried a jig saw on a scrap piece, it cracked!

paigeoliver:
Well, you don't cut all the way THROUGH with the box cutter. You just cut a nice line in it, and then you break it on the edge of the table.

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