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Forums >> Revit Building >> Technical Support >> Void Sweep won't cut extrusion
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Joined: Thu, May 31, 2012
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I'm working on modeling a solid cast iron bracket with different shape cut outs in its side elevation. I created an extrusion for the body of the bracket and used a revolve, sweep and extrusion in void form to make the cut outs. The last void sweep is giving me problems. Every time I try to cut the geometry I get the "Can't keep elements joined" error message with no further detail. I have attached the family file for review. Any help would be much appreciated.
Using Revit Architecture 2013
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Joined: Fri, Nov 12, 2010
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Need more information. What is "The last void sweep is giving me problems. Every time I try to cut the geometry I get the "Can't keep elements joined" error message with no further detail."? Attach a screen shot of the problem area. I see 7 voids total so not sure what one is the problem
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I've attached a screen shot where I've circled the void sweep giving me issues.
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Joined: Fri, Nov 12, 2010
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I must be missing something, you currently have a void extrusion there and it appears to be cutting just fine.
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There is a void extrusion in the same place to cut the portion out left by the sweep. When I use the Cut Geometry tool with the void sweep is when I get the error message.
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I opened the family and could find anything wrong (although I would have used more extrusions than sweeps).
So I Inserted it into a project and still found nothing wrong.
See attached image of project file. Can't find anything wrong.
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"There is a void extrusion in the same place to cut the portion out left by the sweep." - I don't get it... You created a void to cut that solid then you created another void to cut that same void????
Also, why do you need the voids if you can create those "cut-outs" when you are creating that extrusion?
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First, you don't need void extrusions to cut holes in the bracket. You can draw these circles in your sketch for the outline of the bracket and when you click Finish, the holes will be there. This will lighten up the family and make life in Revit eaiser for you. Void extrusions should be avoided in families as much as possible. Second, you're really overmodeling this bracket. You don't need any more than the above mentioned extrusion and perhaps the sweep along the right-angled edges. Forget the decorative detail inside the holes. These families are for specification and clash detection, not for manufacturing; every little bit you model has to be calculated by Revit every time you move around in you view (unless you turn off all 3D elements in all views in the family and draw 2d symbolic lines to represent the geometry in F/B, L/R and Plan/Ceiling views, which is recommended practice). All that detail is lovely to look at but useless and burdensome in a project environment.
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Agreed.
Model this with two extrusions (web & stiffner) and skip the mounting holes.
No voids required.
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Thanks for the replies and help. I was able to get it to work. The file that was uploaded didn't contain the sweep as a void, it was still a solid at that point. I was modeling all elements as solids and then making them voids and cutting the geometry. I ended up using instance parameters to adjust which voids were cutting when so that we could show the owners various iterations of the same overall shape.
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110254_300_Bedford_Canopy_Bracket.rfa
