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WillAdams 5 days ago

One can make arbitrary threads (vertically) on a CNC using a single point cutter (limited by the height of the Z-axis/thickness of the stock which one can fit a tool over/into):

https://community.carbide3d.com/t/thread-milling-in-metal-on...

A manual lathe will often have a gearbox which allows cutting threads on it:

https://www.youtube.com/watch?v=E_KF3n3oo08