wrote in message
Andrew,
I didn't know Cliff meant THAT small. If I had to measure accurately a
1mm diameter hole to a .0025mm tolerance, and had lots of money I
would use an air gauge. If I didn't have lots of money I would make my
own expanding ball gauge. The hardest part would be splitting it. My
thinnest slitting saw blade is .2mm thick and I know thinner ones can
be had so even a 1mm expanding ball gauge could be split in a home
workshop. I wold think that a horologist would have the drills to put
a hole through the center of the gauge and maybe even the slitting
saw. Just ruminating about this makes me want to make one.
Eric
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Be my guest Eric <g>. Small holes I can drill, but turning then halving a 1
mm steel ball is beyond my skills.
Just out of curiosity, as I don't have lots of money, what is an air gauge
in this context?
Cliff.