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Why do assemblies lose mates when inserted into other assemblies?

kevin_thorpkevin_thorp Member Posts: 4 EDU
New user here.

I downloaded & imported a pneumatic cylinder STEP file. As expected, the parts were not constrained. So I Fixed except the rod, adding a concentric mate with limits to that only movable part.

It worked great until I brought that assembly into another assembly. None of the parts were Fixed or mated. Why? 


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