Quote:
Originally posted by sanddrag
There seems to be a large misunderstanding amongst the FIRST community. If it was polycarb, it wouldn't have broken. You used acrylic which will shatter and crack like you wouldn't believe. Both materials look the same but differ greatly in chemical composition and performance. The original real strong stuff is GE Lexan; the rest that is very similar is referred to as polycarb. Acryilic is definitely not the same.
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Actually, Lexan DOES crack, if you ram it hard enough.
http://www.chiefdelphi.com/forums/pictures.php?s=&action=single&picid=2606&direction =DESC&sort=date&perrow=5&trows=5&quiet=verbose
Last year we used the tinted stuff (Lexan brand, from GM). When we ran into a goal last year at full speed, we broke a nice chunk off the edge of the bot. I think we gave the chunk to one of our mentors who couldn't believe her eyes. I suppose it matters at what angle you hit it and if it's an edge piece, etc.