Why do drill bits sometimes break just as they penetrate the first layer of glass?
The most common problem is generally that the technician has not rotated the drill in a circular motion during the windshield repair drilling process. Using this procedure will not only eliminate the bit breaking problem but will also shape the hole in such a way that air bubbles will be much easier to remove from the drill hole. Another solution is to drill halfway through the outer layer of glass, then insert a thin probe, such as the DKI 77-7D double ended scribe, into the break and tap lightly with a suction cup removal tool or similar object. A very small bullseye will be created at the bottom of the drill hole and will not damage the laminate . This procedure is also very effective for stopping long cracks.
