Re: Gauge blocks

"Snag"  wrote in message news:v5keu4$2sp2r$1@dont-email.me...
   Am I really going to need to allow for millionths of an inch ? I'm
looking at an 81 piece set from Shars , a grade B with the deviation
table for under a hundred bucks . Looks like the biggest variance is
.000034" , or about a third of a ten thousandth . I can't see any
project that I might get needing that kind of precision ...
   I'm considering buying the set just because I've kinda wanted some
and I think they'll get me closer to perfect in my upcoming depth mike
project . Since they can trace back to a national standard I can also
use them to check all my other micrometers , none of which have been
calibrated for at least 40 years , and in some cases longer than that .
--
Snag
  It's great to be straight !
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I've never need to use my or a company gauge block set, even when I was building prototypes for the Air Force. They were nice to have for checking and calibrating used micrometers etc, but usually I made one part fit another instead of holding a tolerance range on a batch, and when I did 0.001" was close enough for electronics packaging.
A couple of micrometer setting standards have been enough for me.