I would like to be able to find the rotational moment of inertia of an assembly (that is, to disegnate which parts move around the axis and get the moment for those parts together). There are several different materials involved in these parts. I have the density (kg/m^3) of all the materials. I tried setting mass poperties but everthing in the window is greyed out or locked. And even if I could set that, I am unsure how to find the moment. How do I go about doing this? I could do it one part at a time and sum if needed, since inertia about the same axis is additive.
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