In article , Dave Hinz says...

So...how does one cut a clean leadscrew when one doesn't have
a clean leadscrew to start from? Someone made the first one...

Screw threads have been fabricated for a long time, using manual
methods like chasing. The real trick to to create the metrology
needed to check them, and refine them. Basically you are talking
jo blocks and maudsley.

Jim


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