Dear Clifford Cole,
All the coordonates in the NC files describing the objectcontour and features (and the parameters from the ST block) are always given inmetric units (regardless of any model/default setting that switches it toimperial unit)s, according to the DsTV specification (which states that mm are usedfor file generation).
The inch information can appear in the file name (for examplefor a plate made with imperial units, you get the value PL 3/8" in the NC file, as beeing itsname, but the thickness remains in mm lower in the ST block where the Thicknessparameter is), and also you can create inch-based NC-DXF files by modifying thedefault "NC DXF File units" in the GRAITEC Advance Manager.
Best regards
Philippe