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Old 14th December 2017, 02:36 PM   #21
Roland_M
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Location: Germany
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Quote:
Originally Posted by Foxbat
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.



"but the internal, female one requires a tap of some kind."

As a former lathe machinist, I often made female threads only with my lathe, this is really no big problem. All you need is a special lathe chisel for female threads.

In the old days every tiny manufactory had its own system for screw threads, which was always an enourmous problem, if one of the two parts got lost far away from the company or after the end of the company.
There were absolutely no norms, no DIN or ISO, nothing like that.


Roland
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