"DoN. Nichols" wrote in message
...
In article ,
Harold and Susan Vordos wrote:

"Dave Baker" wrote in message
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[ ... ]

I have an expanding small hole gauge. A split
ball end with a tapered expander inside which opens the two sides as
you
turn the adjusting screw. Adjust until it just rubs in the bore and
then
mike it up across the ball ends.

I have a similar set, again, Starrett, but mine are the half ball, so
they
are affective in very shallow bores. My claim to fame was in producing
small work when I was in business, so I tooled up appropriately.
Again, I
trusted my small hole gages when working in tenths. They are as good
as
the hands in which they are placed. If you learn the procedures, they
are
capable.

While I have a Starrett set, I also have another set which I
prefer. They were made by Lufkin (now out of that business,
unfortunately), and are better in really shallow holes than my Starrett
ones. The Starrett go beyond the maximum diameter point, so really
shallow holes are difficult to measure properly. The Lufkin ones are
ground down to the precise half way point, so they will measure anything
which has a sharp ridge at all.

Were the Starretts ever made that precisely? Do I just have a
later version which is not as nice?

My Starrett set was made in the early '50s, and it's very nice and smooth.
However, I've used them so seldom that I can't testify to their accuracy.

Most of the stuff they made then was really good quality.

--
Ed Huntress