I had lunch with our Tool & Die faculty today and he clearified a bit
of our position here in N. America. We’re tool dependent. We use what
our industry supports and the inch system is deeply rooted in the
machine tool trades. We use the measuring tools we have available.
They prioritise the decimal inch. So many industries use machines
based on the inch increments it will be here for a long time. To
convert sometimes is very hard to do. Especially if there are a lot of
figures. How did that Mars exploration go any way?
I also think I have a hard time dividing anything into only 100 parts
and thinking these are really small parts (like 9.98 mm) When this
part in inches is .3930. Now looking at these two numbers you would
think the inch fraction is the smaller number. I’m still learning
remember. And who says you can’t teach a old dog new tricks?
Using a good digital caliper I would always order a 10 mm stone to
metric dimentions. But where do carats fit in? Aren’t those based on
Carob seeds? Are those metric? I do know campanies who order stones
measured in thousandths of an inch because they fit into CAD design
that require those sizes. Those sizes are then made into bezels tooled
to those tolerances.
I certainly want the metric to be our standard and do see more and
more metric measurements in the jewelry trade.
The good Mitutoyo digital caliper I use is either .0000" or .00 mm.
so I have to look at measuring as a draw. With the tooling I am
learning the inch does seem to win though.