I'm trying to run a dynamic analysis using a servo motor and just gravity for a landing gear, but everytime I try I get an error message stating parts have zero mass. I know it's the sub-assemblies that are causing this because when they are removed, the dynamic analysis works just fine. Unfortunately the subassemblies are a requirement for the project. Material files are assigned to every part, all part files and assembly files are in the same units and the sub-assembly files give mass measuremtns for the parts contained in the subassembly. It's only when I go to the top assembly that the analysis fails, and mass analysis of the top assembly says the two sub-assemblies have unknown material and masses. I have no idea how to fix this and would appreciate any and all help!
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