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plexi drilling tips?

B

boardsportsrule

[H]ard|Gawd
Joined
Nov 27, 2003
Messages
1,107
hey, well if any of you have worked with plexi u know that when the bit goes thru the last little bit it sometimes chips... if i were to attach the plexi to a peice of wood(lets say plywood), would it still do this, or since its almost like 1 material it would cut nicely every time? i find that if i go slow and hold the plexi down against the base of the drill press hard enough it cuts nicely, but i have over 200 holes to drill and i dont wanna have to redo it because of 1 screw up...please advise....thanks! :)
 
yea, its not the start that i have problems with, its the end, right when it breaks thru the plexi it has a tendancy to crack the plexi.....any one know if getting a special plexi cutting bit would be worth it? any REAL benefiets?
 
i just use a drill press. I didn't use masking tape and it worked fine aside from slightly melting the plexi, but it's covered up anyway. make sure and clamp it down good. then if you have a steady hand, a hand drill should work fine.

 
I also use a drill press, but what I do for the last couple mm of the hole I'm drilling is to spin the bit backwards and barely hold it to the surface (basicly no actual pressure). It takes longer for it to shave away the last bit of plexi, but it makes a nice clean exit hole. What also works is to drill 1/2 way through, flip the plexi over, then drill the last 1/2 through from the other side.
 
If it's a sharp bit you are using drill it into a concrete or a brick a couple of times, yes i'm serious.

Tis an old trick of the trade withot having to go out and buy expensive plexi bits :)
 
They make special bits for plexi, there designed to work at a slow RPM, some of these might fix your problem, but I like your idea of placeing a block a wood under your work, it will keep the bit from breaking thru that last little bit and ausing cracks.
 
Other than what Others have covered here, Use low pressure and low RPMs.

After the hole is made, Use a hot knife or even a small open flame to melt the inside of the hole you drilled. This is seal up any small fractures and make the area stronger.
 
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