1/ Talking about threads: yes, I could take a steel cylinder, a strip of paper, and a file, and make a thread. And it could be decent.
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10/ 60° at one end of the screw, it's the same in the middle, and at the far end, etc. Not worried about thread profile, which comes from
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11/ the shape of the cutter. American Unified Thread standard has 60° profile (IIRC), and that is easily derived though simple geometric
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