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Lets Settle this now, Plexi Cutting

A metal cutting bit is angled at the cutting edge like /_/

To modify it to cut plastic fill/grind the cutting edge flat like |_/
so the bit dosn't dig into the plastic and crack it but scraps the
plastic away.
 
Originally posted by marked
A metal cutting bit is angled at the cutting edge like /_/

To modify it to cut plastic fill/grind the cutting edge flat like |_/
so the bit dosn't dig into the plastic and crack it but scraps the
plastic away.
Click to expand...

Just FYI- the ones I gave the items number for have a carbide cutting surface brazed onto the steel stock. No modification is nececary, and would ruin the bit.

Don't want anybody doing this to the wrong bit and ending up with junk, so hey. :D

BTW- have you tried that on polycarb? I think that would be the right thing to do with acrylic, but I think with polycarb it would be unnececary.
 
i have on of those fly cutters. i think it cuts up to 4" diameter holes. mine doesn't work on metal (at least i don't think it does, and i'm not really willing to try, but it works great on plexi) when i cut the plexi for my window, i just used a jigsaw and the fly cutter for the blowhole. i also smoothed the edges with sandpaper. works/looks great.
 
Waterjet?

Ok, I really don't know how well that would work (I expect pretty well). Just last night, though, I had to cut some plexi for a box I'm building. My dad had the idea of using a scroll saw. To get a useful cut, I had to have it at the lowest speed, or else the plexi would melt and bind. There may have been a faster way (I like the fly cutter idea for circles), but I got two 120mm holes, a 1" hole, a 1.5"x3/4" rectangle, and a fairly intricate (12 straight cuts) cutout for my radiator done in a couple of hours.

After the initial cutting, we filed the edges up nice and smooth and I like the way it's turning out...for this being my first time working with plexi as well as most of these tools. I've been taking pictures (just got a new digicam for Christmas) so I should be able to post a worklog on it later, when I get it put together and working.

Nitrogen
 
For all you guys who don't want to use lexan because it scratches easier, there is an abrasion-resistant variety available. Check McMaster.com for prices/sizes. Is a bit spendy though.
 
Back in 8th grade we made stuff in shop class out of plexi, and we always used hand jig-saws to cut, and then files to smooth it out. Worked great. We then wet sanded. I still have some of the stuff, and it turned out really good.
 
Home Depot and Lowes both have plexiglass and Lexan. You can buy a full sheet or smaller pieces. I know that they have Home Depot in Georgia.
 
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