In article , Dave Hinz says...

Can you use the lathe to turn the stock, and use a die to cut your
threads,

A die won't give a precision lead to the part. Because this is
a leadscrew for the lathe, that's not the best way to make
the part.

Leadscrews not only have to have the correct thread geometry,
but they are effectively length standards in and of themselves.

A die-cut leadscrew would work, but it would impart all the
lead error into whatever parts were then fabricated when
using it on the lathe.

Jim


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