Check which UCS letter represents the axis your assembly will rotate around. When the moment of inertia calculation screen appears, click on the Options button and change the mass units to “Kilograms” and length to “Meters”.Ħ – Position the assembly so that you can read the moment of inertia data and see the colored UCS in the bottom left of the screen in the same view. The positioning should be “concentric”.ĥ – With no object selected, click on the “Evaluate” menu, then “Mass Properties”. ![]() The positioning should be “coincident”.Ĥ – Also align the Solidworks Origin with the center of the assembly’s rotating disc using the Assembly icon (clips). All items should have correct dimensions and masses/materials defined.Ģ – Let the assembly float by right-clicking on the assembly (a).ģ – Align the rotating disc of the assembly to one of the standard planes using the Assembly icon (clips). Solidworks 1 – Create an assembly with all the items that will be moved by the indexing table (disc, devices, screws, parts, etc). ![]() Please consult your CAD manufacturer for the exact procedure. Other CADs have similar methods for this calculation. We’ve created the step-by-step guide below to help identify the moment of inertia of your assembly that will be moved by the indexing table, using the CAD tools Solidworks and Inventor. ![]() There are several ways to determine the moment of inertia:Ī) manually, using mathematical calculationsĬ) with CAD software (Solidworks, Inventor, Catia, NX, etc…) The further the mass is from the center of rotation, the greater the moment of inertia.Ĭalculating the moment of inertia for your assembly is crucial for determining the best indexing table for your needs, without risking oversizing and incurring excessive costs, or undersizing and not meeting the required resistance. The unit is typically Kg.m 2 (kilogram times square meter). Moment of Inertia Calculation in Solidworks or Inventor In mechanics, the moment of inertia, or mass moment of inertia, expresses the difficulty in changing the motion state of a rotating body.
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