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Forums >> Revit Building >> Tips & Tricks >> 2D Arch file usful for Revit Struct?
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Joined: Fri, Jun 6, 2008
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Is it posible to get files from a client who created their commercial buiding from Xrefed units and use it to frame it up with Revit Structural? How would it work if 3 floors have this same unit but rotated?
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You can use CAD drawings as backgrounds in Revit but I would be careful. We have found that CAD drawings are typically inaccurate. Lines are not truely parallel, dimensions are not accurate to Revit tolerances or fudged completely. Use it as a background, but only as a reference and add 1/256" tolerance dimensions to verify everything is correct. If your new elements won't dimension, they are not parallel so fix it now.
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That has to be one of my biggest annoyances of people uses of Revit. I really prefer all my dimensions being to 256...if it is supposed to be 1'-4" I should make it 1'4" not put in a dimension that reads 1'4". Granted this does not work in ALL cases, but most of the time I feel that the highest accuracy dimensions should be use...
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WWHub are you saying that if I create a 4'x4' square and import it into Revit and dimension it, that Revit's tolerances will read it 1/256" off? Wouldn’t this come from Precision settings in the Dim settings within AutoCAD that the Architect, Designer etc.. doesn’t use or don’t setup correctly or high enough? If that’s the case then the standard disclaimer I see in structural plans that their design is based on Architectural dimensions would release liability from structural and back onto the Architect, correct?
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you wrote "....WWHub are you saying that if I create a 4'x4' square and import it into Revit and dimension it, that Revit's tolerances will read it 1/256" off?..." No - I didn't say that.
Revit does not like very small units but autocad will let you use them. In addition, when you draw something in Revit, Revit's associations tries to make sense of what you are doing. If it looks like it sould be parallel with something else, then Revit defaults to be parallel. AutoCAD doesn't check and what appears to be parallel, might be off .000xxx in autoCAD. And finally, Revit's normal dimensions are from faces where autocad'd are from endpoits, intersections or just nearest. Most autocad drafters don't care about these dimensions because they are always using rounding dimension setups. So given all this flexibility in AutoCAD, you will find you have problems in Revit where precision is important.
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Ahhh I understand now thank you for clarifying that. That being said, back to the original questions. How do I handle using Revit Struct to work with an Architects use of the same unit, but rotated & mirrored on multiple levels? Example 5 floors of 8 different units all being used on all floors but mirrored & rotated. Currently we do NOT dare mess with their setup. We frame up the unit plan setup by the Arch, and have it populate the floors where they used this plan. In cases where its mirrored we have to mirror our work (blocks, text, etc.) so it shows up correctly. As you can imaging it's a huge pain to work upside-down and mirrored. currently we are pushing hard to make the switch, and testing with pilot projects. However IT is working on this and not the actual drafters. Not by choice but by lack of time. We cant stop to test and study with our currently work load. I am taking classes to be a part of this as soon as it launches.
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I thought we answered your original question.... use as a background. Obviously Revit has tools for mirroring & rotating. I would think though, that you create the items in revit and mirror - rotate those. Why use the background more than once?
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Sorry WWHub I must not be explaining myself correctly. I work for a structural engineering firm that is working on switching to Revit. Our current clients typically send us a few floors populated with 5+ typical units. Most floors have about 50+ units and with only 5+ typical they mirror to avoid redundancy. Currently we use their existing viewports and xref setup; we do manipulate them in any way. We take their unit plan and add our framing. Since the entire floor plan is populated with these units automatically our framing gets added on. However some of the units are mirrored. We then use layers and viewport management to correct this. Unfortunately for us we have to draft upside down for those units that are mirror. Reason is because they are not mirrored in the unit plan but in the floor plan where they are being xrefed in. Regardless of this being bad practices we have no control and have to deal with what we get. Unfortunately we deal with many Architectural firms that do this, so we developed a system that works for us. Because of this system we have developed to deal with this kind of situation we don’t understand how to deal with it within Revit. So the question is how would a Revit structural professional or firm deal with this situation and still deal with very tight deal lines. I hope that helps both of us to reach an answer, may help others.
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Using their backgrounds - - create what you need for these 5 + typical units ....
- group each one
- Revit does not like mirrored groups so place each group once and ungroup / mirror and regoup as a mirrored group
- now place as many left hand/right hand groups as you need - any of those can be rotated as need be.
Groups are very powerful in Revit and are similar to x-refs. I want to amend this ... groups are more like blocks. Linked files are closer to x-refs. I would not use x-refs here but you could.
Edited on: Mon, Nov 8, 2010 at 11:37:45 AM
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