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Application engineering

The value that connects your load to the right indexing table

Moment of inertia describes how strongly a rotating assembly resists a change in speed. Mass distribution matters just as much as total weight.
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Moment of inertia

01 / Moment of inertia

Why calculate it

Knowing the moment of inertia prevents both oversizing, which raises project cost, and undersizing, which compromises performance, service life and safety.

02 / Moment of inertia

Three ways to obtain the value

  1. 01Mathematical calculation from geometry and mass
  2. 02Technical configurator on the quote pageCalculate moment of inertia →
  3. 03CAD mass properties in SolidWorks, Inventor, CATIA or NX

CAD

How to obtain it in SolidWorks

  1. Step 01

    Create an assembly containing every item moved by the rotary indexing table and assign accurate materials and masses.

    How to obtain it in SolidWorks — step 1
  2. Step 02

    Float the assembly so it can be positioned relative to the origin.

    How to obtain it in SolidWorks — step 2
  3. Step 03

    Mate the rotary plate to a standard plane using a coincident relation.

    How to obtain it in SolidWorks — step 3
  4. Step 04

    Align the assembly origin concentrically with the plate center.

    How to obtain it in SolidWorks — step 4
  5. Step 05

    Under Evaluate > Mass Properties, set mass to kilograms and length to meters.

    How to obtain it in SolidWorks — step 5
  6. Step 06

    Use the UCS to identify the rotation axis and record the matching component, such as Iyy for the Y axis.

CAD

How to obtain it in Inventor

  1. Step 01

    Include only the components that will move and verify their materials, dimensions and masses.

    How to obtain it in Inventor — step 1
  2. Step 02

    Under Tools > Document Settings > Units, select meters and kilograms.

    How to obtain it in Inventor — step 2
  3. Step 03

    Constrain the plate to the XZ plane to establish Y as the rotation axis.

    How to obtain it in Inventor — step 3
  4. Step 04

    Constrain the assembly origin to the plate center.

    How to obtain it in Inventor — step 4
  5. Step 05

    Open iProperties from the first item in the assembly tree.

    How to obtain it in Inventor — step 5
  6. Step 06

    Under Physical, select Update and Principal. For rotation about Y, record I2 in kg·m² and send a screenshot with the geometry.

    How to obtain it in Inventor — step 6

04 / Moment of inertia

Use the value in application sizing

Provide the moment of inertia, index time, mounting position and external loads so Gyroindex engineering can select the appropriate rotary indexing table.
Calculate moment of inertia →