All I'm trying to do is propagate a feature to a part. Apparently SolidWorks doesn't know how to do this and all of the mates in my assembly break. Why is this happening?
Without seeing the part, assembly or your feature tree it is hard to guess what is going on...
What John said. Though a guess is that your mating a face to a face, then putting a hole on that face or even dividing it with said cut-extrude? One of the tricks of using SW is that mates between reference planes and sketches between parts are much more stable than ones made to the faces, edges, and vertexes of parts. Make a changes to said face, and you risk losing any mates made to it.
As I explained once to co-workers, sketches are the support structure or bones of a parts, and the features are what is wrapped around it, or the flesh of the part.
Steven Mills wrote: Though a guess is that your mating a face to a face,
Steven Mills wrote:
Though a guess is that your mating a face to a face,
Make sketches and planes in the parts visiable, and use those. More trouble to do yes, but a lot more stable than using faces, part edges, and vertices.
SolidWorks does know how to do that. As the others have said, without more information all we can do is speculate, but is it possible the cut removed a surface, edge, vertex, etc that was used in a Mate?
Sounds like if you're modifying a face in which a mate depends on it, it will lose its relationship. From the looks of it, may need to make sure that either the cut is done in-context so it creates external references or do the cut in the assembly-level so the feature is dependent to the assembly.
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