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March 14, 2022 at 10:49 pm
#5618
Participant
I haven’t seen it done vertically, but I have seen tanks drilled with the glass horizontal. In that scenario, the area around the hole was dammed with clay and had some water added. A variation for your use might be to use clay to hold a yogurt cup cut in half to some water to help cool the bit. A tungsten carbide hole saw should drag enough water with it that way to help keep things a reasonable temp.