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In Reply to: How do I safely drill plexi-glass? posted by KWILLIS on August 4, 2005 at 04:16:34:
Get another small piece of PG if you can, to practice on.
Putting tape on the backside may reduce edge chipping when you break through. If you drill a small pilot hole, it should be about the same size as the center solid section, or "web" of the larger drill. If the pilot hole is too big, the large drill may get "sucked in".
Follow Ups:
Please don't take offense but this is bad advice. If you drill a pilot hole the next drill will wobble all over the place and crack the hole edge. The drill point needs constant contact with the workpiece and if you drill a pilot hole, this contact will be broken.The proper way is to "dubb" the cutting edges of the drill prior to drilling. This slightly dulls the sharpness of the drill so it won't suck through as well as offering a better finish.
PS: Place your workpiece on top of a piece of material to back it up. The more rigid the setup, the better results you will obtain.
FWIW, I've machined and drilled acrylic over the past 25 years. Good luck.
to get best location.just don't go too deep,you don't want to break through.
enjoy,
mark
In all my years as a machinist, I've never drilled a pilot hole for drilling plastic, but I thought it might be ok as long as it was not bigger than the web of the larger drill. But then, I've always used a proper setup on a mill, and not a hand drill. Thanks for the correction.
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