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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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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12/ construction with a straightedge and a compass. I've got a vague memory that the first high precision thread was hand made near perfect
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