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When selecting the appropriate servo motor for a motion control application, one must know the inertia of the load being rotated. Most servo motor manufacturers have software for sizing applications using basic mechanisms, such as ballscrews or rack-and-pinion. More complex systems, however, may require manual calculations. Increasingly, applications use mechanisms where the center of rotation is on a different axis than the center of mass. This can lead to some challenging inertial calculations.

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