Gerhard Fiedler wrote:
>>> All CAD where I've looked into this use an integer representation
>>> that is a sub-multiple of both mm and mil.
>
> Can that work? What base unit would that be? I don't think such a
> number exists.

It certainly exists and some CAD systems use exactly this method.  As
someone else already pointed out, 100um is a sub-multiple of both a mm (10)
and inch (254).  By factoring out the common 2, you get 200um as a base unit
for both (1/5 mm and 1/127 inch).  You can keep scaling that down until you
get the resolution you want.


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