NO, nope , not going to happen. No drilling of tempered glass. you can drill ANY glass before it's tempered ,which is what I used to do at chryslers Glass plant. 90% of my work has been working with the complete process from flat glass to cut,seamed(ground the edge to make it not sharp and cut you open) and drilled glass, the moved it into the print room to be printed if a windshield or backlight (the black band and silver grid for heated backights.) to setting up the furnace to run for the bending and quenching operation right out to the gauging system and umloader. The lines I ran were about 1/4 mile long with 2 people (a loader and a hilo driver to move the full racks) at each end and me in the middle running everything(well along with 20 robots I had to program, but they don't count) Once it is tempered think of it as a huge balloon just waiting for a sharp corner to come along and pop it (tempering in glass technologies means that when it's quenched in High pressure air the OUTSIDE shrink faster than the inside and "freezes" into that shape with the INSIDE always wanting out.) Once it tempered you might be able to grind a chipped edge as I have with a wet diamond file, really slow. 9 good tries and 1 a spectacular failure is how it usually goes, Unless you really need that part then it breaks right away.
