06-13-2012, 06:44 PM
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CC Member
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Join Date: Oct 2003
Location: Golden Isles,
GA
Cobra Make, Engine: Butler Cobra. 350 Chevy Engine, blueprinted, heads cc'd, ported, polished, manifolds matched, big valves, 1.6 roller rockers, TB Injected, mild cam, MSD crank trigger electronic ignition. TKO-600 transmission. XKE Jaguar rear. IFS by Fast Cars
Posts: 558
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When drilling through Lucite/Acrylic/Plexi-Glass, Lexan/Polycarbonate and Fiberglass you need to use a drill bit that has a point and cutting edge that is designed specifically for these materials.
You can buy these from a supplier like McMaster Carr and is cheaper than the heart break you will experience when you crack your material.
If you know how to sharpen drill bits you can make your own by first sharpening the tip to about a 70 degree point. Then you grind the two leading edges (cutting edges) of the drill bit to increase the angle of the cutting edge. It is very easy to do. In actuality you are giving the cutting edge a less acute angle.
Slow spiral drill bits are also better for drilling these materials with modified tips as I've tried to explain.
Good luck!
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