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It isn't possible to show ONLY ONE dimension in a drawing in dual fashon (eg. mm [inch]); the dtl option "dual_dimension" acts on all drawing dimensions. Several times I need to show only few dimension in that way.
WORKAROUND:
1. Create a relation in the PART (or ASSEMBLY): <parameter>=D#*<scale factor> (EXAMPLE: PARAM1=D25*25.4)
2. Modify the dimension text to: D# @[<¶meter>@]
but doesn't seem so smart...
It can be done by changing the dtl option, but it should be able to be done in the dimension properties dialog.
in fact if you change the dtl option "dual_dimensioning" all dimensions are affected ! In most cases I'm interested to this job only for certain dimensions so... I agree with Dan: it should be able to be done in the dimension properties dialog.
I have been using the same workaround!
It is relatively common for us to need a metric sized or threaded hole or other features in a normally English dimensioned drawing. Often, we may not want "dual" dimensions, we just want to be able to display a particular dimension in a different unit than the rest of the drawing (AND display the unit in the dimension). Yes this CAN be done with the above work-around, but we shouldn't have to. This needs to be a part of the individual dimension dialog box. BTW - Solidworks has this capability.
What about doing it at the modeling level?
I would like to keep the intent in the model too. It seems strange that I can control the precision and tolerance 'style' individually but I can't control the display in dual mode. There I times (on very complicated parts) where I send the model to the shop for them to process with there CAM package. I would like to make sure they recognize the proper tooling.