30/ I may have 90% answered my own question at the very beginning.https://twitter.com/MorlockP/status/859033195307835392 …
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41/ Now I want an NEA grant to fund me building such a thing. I'd put it in a gallery. Patrons can turn a crank and slowly advance cutter
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42/ Which, over time, turns a rough piece of rod into a toolroom-quality screwthread.
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Once you make two threads, you can average them to make the third higher precision. IIRC Da Vinci designed a machine for that.
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so averaging is a powerful technique. I was reading up on Whippletrees the other night in bed https://en.wikipedia.org/wiki/Whippletree_(mechanism) … bc I had a thought
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