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NEND | I agree that the hole isn't round because the web/chisel point of the drill has to keep the drill bit in control and starts wondering around. Your original question is why is it triangle shaped, and no one has answered that part of the question. I have wondered why this is as well. You have two flutes on the drill bit, how does it wobble around and make a three-sided hole. I'm not sure frankly. There have been good solutions mentioned. I have a uni-bit that works well. If you don't have one of those, step up to the desired size gradually with regular bits. | |
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Why do drills make a triangle hole instead of round in thin sheetmetal
