Drilling glass

[TasV]

Have any of you successfully drilled glass before? I am thinking of retro-fitting a sump to a tank I have but every time I try to drill glass with the glass-bits I have I break the glass (test pieces only, thankfully). We have been using water to cool it but we get to the end and as the bit is about to cut through the glass breaks or pops a scallop of glass out from around the hole on the other side.

[CQAngels]

Mate the secret to drilling glass i have found is to, use a lot of water, move the drill bit in a circular motion (slowly) and take your time. I also put the glass i am cutting (if a lid onto foam)
You can make a template if you need to and once you are half way through. Put it on the opposite side and drill back through. This will give you a much cleaner hole. I don't bother as the gasket on the bulkhead fixes and hides any issues from the scalloping.

[jeff@zina.com]

Can't drill tempered glass so know what you have. Otherwise, I've drilled hundreds of holes with no issues.

Jeff

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