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Old 14th December 2017, 01:37 PM   #16
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Join Date: Oct 2012
Posts: 69

Originally Posted by kronckew
screws were known and laboriously hand filed, as were small intricate gears in pre-christian greece/rome. common metal screws were 16c and accurate screw cutting lathes were invented late 18c.

Thread-cutting machine tools - yes, later, and yes, the screw thread can be cut by hand, but the internal, female one requires a tap of some kind.

I presume these developments have been studied and documented, I would be curious to see them.
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