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see that's what happened to me on my first hole. the saw b/c it was a bit wobbly popped the core out and it left small chips around the hole. next 2 holes i hot glued a piece of wood to the glass, this way the glass didnt move and it was much cleaner.
as for not taking a while, i asked a glass shop how fast i could turn the drill, they said nothing more than 300rpms when cutting glass like that w/o a press, b'c if it's spinning real fast, than there's greater chance to slip or anythign else to happen. theres a website on this saying how it causes much stress to drill the hole really fast. i drilled all 3 of mine on a real slow setting. ya, it took longer, but it didnt put hardly any stress on the glass as opposed to going ape **** and making the drill go at full speed.
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