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Mass moment of inertia

dave_franchinodave_franchino Member Posts: 54 ✭✭
in Using Onshape

Greetings,

When Onshape reports the mass moment of inertia in mass calculations, is this relative to the model coordinate system or relative to the model CG?

I have reason to believe that Onshape is reporting the mass moments of inertia relative to the model CG - not the base coordinate system.

Is this true?

Thanks!

image.png


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Comments

  • Oliver_CouchOliver_Couch Member Posts: 228 PRO

    • Moments of inertia
      • Calculated with respect to the common centroid of the selected parts/faces (not the Part Studio/assembly origin)
      • For parts, calculated using the densities of the assigned materials assigned. Any selected parts without materials assigned are omitted from the calculation. If no materials are assigned to any selected parts, no calculation is made.

    https://cad.onshape.com/help/Content/massprops-ps.htm

  • GregBrownGregBrown Member, Onshape Employees, csevp Posts: 211

    also, you can provide a Mate connector as a reference frame for the calcs.

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