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Drilling a Hole in a Glass Bottle
I have been successfully drilling holes in flattened glass bottles using a dremel with the 2' extension wand, a diamond core drill bit, and a "drill buddy" filled with water to hold the bottle. Recently I had a bottle that was thicker than normal and I couldn't drill all the way through the bottle because the "core" of the bit filled up with glass before the hole was all the way through. I cleaned the core, but then had trouble finishing the hole because I couldn't see clearly how to get the drill bit back in the hole.
I'm not very sophisticated with this (as you can probably tell...) Two questions:
1. Can I insert the drill bit back into the hole BEFORE I restart the dremel or does the dremel have to be on before I can put it back into the hole?
2. I have searched online for diamond core bits and it seems that they range in diameter from 1/4 inch to well over an inch, but I can't find any information that tells me the measurement of the depth of the bit. Anyone know how I can tell how "deep" the core of a bit is?
Thanks for your help!