"John Martin" wrote in message
...
On Feb 28, 9:59 am, wrote:


It sounds to me like your main problem is that you are not comfortable
with
telescoping gages. They are a little fiddley so I would suggest that
you play
around with them a bit until you get the hang.

True. You have to learn that you do not set the gauge to the bore,
but use the bore to set the gauge. You don't try to square it up in
the bore and then lock it. That will give you a false reading, as you
may or may not be square in the bore, and you may or may not be at the
largest diameter. Instead, you lightly lock it at an oversize and
gently wiggle it through the bore, allowing the bore to compress it to
the true size. Lock that size and then continue to wiggle it - there
is a lot of feel involved.

John Martin

Not a lot-----it's everything. If the method you described is not used, they
won't provide a reading worth having.

I've done .0002" tolerance work with telescoping gauges all my active years.
If you acquire the feel, they're very accurate, assuming you understand that
you must duplicate the feel of the bore with your mic when you check the
reading. It's all about experience, which comes from doing it again and
again and again-------you get the idea.

Harold