Forums >> Revit Building >> Technical Support >> Invalid Dimension to linked AutoCAD file.

paulh

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Joined: Tue, Sep 13, 2005
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This is annoying. Every time I reload a particular linked AutoCAD file in Revit I keep getting errors that 19 of my dimensions have become invalid, but I haven't changed anything in the AutoCAD file. I just relocated it to a different directory and tried to update the path in the Link Manager.

Anyone know what is happening here?

PS - I also think having to delete invalid dimensions is dangerous. A firm can get sued if vital information goes missing. I think Revit should just flag these dimensions so the drafter can repair the dimensions later. 

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TomDorner

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Joined: Sun, Apr 25, 2004
1207 Posts

Yes this can happen to dimensions to linked ACAD files.  There are a couple of solutions.

1. Don't dimension anything to the ACAD file.  Instead place Revit reference planes/drafting lines or the like over the ACAD file and dimension to these.

2. Establish a 'Shared Coordinates' system between the ACD file and the Revit project.  Unless you do so Revit will keep shifting the ACAD file slightly each time you reload it since it is looking to center the ACAD file extents into the Revit view.   I have been experimenting with adding an ACAD 0,0 origin to our Revit template.  Check the Revit help file for more info on shared coordinate systems.

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Tom

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tmak0731

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Joined: Tue, Mar 13, 2007
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I have the same experience with Linked Revit file.  My project consists of a north and a south tower on top of a podium.  Each of these components belong to its own RVT file, and they are linked into each others.  Although I have published the shared coordinates from the North Tower Central files to the linked in South Tower and Podium.  But I still have incidents that dimensions got automatically deleted during file opening process.  I then tried to acquire North Tower's shared coordinates in the South Tower Central File, and the repsonse from Revit is that they are already synchronized.  What am I doing wrong?

 Dickson

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