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That's true, and I usually use a small sprayer bottle to keep the glass wet as the bit goes through. For drilling larger hoses, a drill press with a coolant/water spray is what you need, but if you're drilling just a few holes and don't want to buy a coolant spray rig, you can always have a friend keep the bit wet with a sprayer as you operate the drill. For very large holes, I've had good success with masking off the area to be cut with a layer or two of 4--mil rubber and the making the initial cut out with a pressure pot blaster using silicon carbide. A standard glass router can then be used to do the necessary clean-up.
To drill holes in glass, plumber's putty (a soft putty used to form seals between sinks and drains, etc.) is just the thing. Roll a small piece of putty into 1/4 to 1/2 inch thickness and form it into a circle. Place the circle of putty over the spot to be drilled and use water to fill the putty "dam". Keep the dam filled with water, and frequently back the drill out to insure it's not clogged with glass residue as you're drilling. An eye dropper is useful for this. No glass dust, and very little heating of the bit or glass if you do it correctly.
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