"Steve" wrote in message
om...
I need to indicate an internal thread. It is a 2 1/4-8 thread and it
is on a backplate. Someone bored the register off center and I need to
bore and resleeve the backplate but the register bore has got to be on
the same centerline as the thread to make this work. I have the back
plate set up in the 4 jaw now I just need to figure out how to dial it
in so the bore and the thread centerline line up. Any suggestions
greatly appreciated. Thanks, Steve

Dial in the pitch diameter of the thread while the feed train is set up for
8tpi and engaged, so your indicator follows the thread as the chuck is
turned over by hand.

Ideally, your ball on the point of the indicator should be close to same dia
as a thread measuring wire would be for measuring an 8 tpi external.

--

SVL