In article , Ignoramus25487 says...

What is the standard approach to this problem.

1) leave a runout zone for the threading tool to dwell in
when you unlatch the half nuts, or

2) use a dial indicator on the carriage that winds to zero
where you want the thread to stop. Unlatch the halfnuts
at that point and allow the tool to make a circular groove
there, after the thread is done go back and put a radius
at the bottom for strength - or,

3) use three phase power and plug reverse the lathe to
a stop at the desired location.

Jim


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