In article , Steve says...

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

One way is to make a tight fitting plug gage threaded the same
as the backplate. Leave a section sticking out that you
can indicate on.

Another approach (easier) would be to a) make a short
ring spacer to go over the register diameter on the spindle.
b) re-sleeve the backplate undersized. c) put the backplate
on the spindle, wrong-way-around, with the ring spacer in
place to allow it to bottom on the spindle.

Then bore the register diameter.

The first way would be more accurate, I think.

Jim


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