We are working off of a model that was supplied to us where some duct is present. When selected, in the items properties, the elevation PRECISION is set too fine for us, example: top elevation =5' 7 195/256". We want a quick precision down to the 1/8" instead, how do we change this setting?
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Are you asking how to change the Project Units precision? Manage Tab=>Project Units.
You cannot. The precision shown in the Properties is based on the actual model. You can only change the units format for reporting means such as tags, spot elevations, schedule fields. Changing precision under Project Units will not affect the value shown in properties.
Units are defined via Project Units, there are many but in this instance that is the Length unit.
It's my opinion that isn't a good idea to change the overall project units to something that is ordinarily considered a rounding condition versus tolerance. I recommend a project's units be set as deep as the software will allow (length being 1/256" in imperial units). This way such subtle dimensional values are not obscured from the Revit user, modelling activities. If it is more obvious then it can be dealt with by placing elements at specific values intentionally.
For documentation, dimensions, tags and schedules that display these values can be overridden to display with a rounding preference. Otherwise nobody will see the fussy values you're writing about.
Lastly, the elevation values you'll see associated with pipe/duct, and many other elements, may not ever be able to reflect a perfectly clean value because they are inherited. A duct elevation is in part derived from the elements it is connected to. Unless the component it is attached to is designed to place the connectors it uses at clean values it may impose fussy values on the connected duct/pipe. Sloping conditions will impose them as well.
Edited: I now see the other two replies that posted while I was writing, my comments are assuming you are going to edit the model you were provided with, not from within a file that is hosting a link to their file.
Steve Stafford
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If I noticed an odd value like that, I'd suspect it wasn't the critical dimension. I'd look at the bottom and middle elevations next. If all of them were non-standard values, I'd have questions for the person that originally placed them.
Since the project units were required by the customer to be so precise, the elevation tag we created was set to pull the elevation but to not match project units and match our normal precision. This allowed both parties to be content.
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