these are direct to the fabrication shop here in house. we are trying to utilize isogen to produce fabrication isometric drawings. we are 99% there we just need another 1% to be perfect so the fab shop is not adding up or subtracting dimensions and we are not manually editing iso's in the design dept. Is there no way to force the dimensions to the face of flange of the spools versus one side of a spool flange and the other side of a valve face?

"Traditionally, isos have always shown a gap between flanged connections" true when these connections are not face to face without gaskets. the gap or hash/tick mark between the dimensions designates a gasket gap. I would beg to differ, In my 20 years as a piper I've never seen from a drafting perspective wafer or lug butterfly valves without gaskets get a gap or gasket tick mark its always been a single line to the face of flange dimension.

I know plant 3d can do this pretty easily.
https://knowledge.autodesk.com/support/a...c38d5c2f57.html

https://forums.autodesk.com/t5/autocad-p...wf/td-p/6977594

and so can bentley: https://communities.bentley.com/products...enplant-modeler

maybe there is a way to force or fake the gap to respond how we need it to graphically be represented accurately?