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Composite assembly inertia information


I've made a catproduct consisting of multiple parts made in the composite design workbench.
I would like to get the correct weight/inertia of the complete part. is this possible?
When i use the "normal"measure inertia tool it gives a completely wrong mass since it just assumes a density that is incorrect (for example 10 kg/m^2). In the composite design workbench it is possible to do a numerical analysis which gives the correct mass of a single part, however no inertia information. This tool also can not be used for the complete assembly.

Any help is greatly appreciated.