The problem you face is a common one now days for the jewelry CAD
There are few bench jewelers who know tolerances that also do CAD.
I know three in the Twin Cities who could possibly help you. Contact
me off line for their numbers. They all use Matrix.
I did a demonstration of casting, pricing, polishing and assessment
last week with a man’s signet ring. It was a fairly simple project.
We went from start to finish with the ring. The ring was 6.59%
smaller when the whole ring was finished.
Here’s the point. As far as I know in the current CAD world the
rings are designed to the finished specifications. So if you make the
exact file, your ring and all the exacting parts are too small.
If your CAM operator has any experience he or she will allow for the
loss and make the part larger. This is not the same shrinkage across
all jewelry though. Smaller parts have a different percentage. This
could complicate your project a bit.
Just a thought…
Southeast Technical College