Not necessarily; chasing or "picking up" an existing thread on a lathe
with a threading dial is (or at least was) a pretty straightforward task
for the average machinist. You just get the cutting tool close to the
threaded part, close the half nuts at the appropriate mark on the
threading dial, stop the lathe, then very carefully use the cross and
compound to seat the threading tool in the thread and proceed as normal.
Dave
Arvid Jedlicka wrote:
> When they removed the pipe from the chuck after threading all bets were
> off as to synchronizing the existing threads with the cutter when they
> put it back in the chuck. Easier to just start over again.
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