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When you have a purchased part in your assembly (directly pulled off the vendor's website), how does SW account for it in its centre of gravity calculations? This could either be a shell model or a regular part.
Can you assign material properties to a shell model?
SolidWorks treats imported parts (shell models) without mass properties and the centre of gravity will be where the origin of the model is.
You can however assign mass properties to shell models. To be able to do this you need to know the weight of the part and if you really do need to assign the centre of gravity then you will have to do this by hand and then assign it in the mass property window in SolidWorks.
Please have a look at the jpg which I have attached.