This paper describes a new method for evaluating the contribution of a hexapod frame structure to the machine's overall stiffness. A stiffness model that includes the contributions of the actuators is first presented. Use of such a model to obtain a good estimate of the stiffness contribution of the support structure to the overall machine is then discussed. Finally, the procedure is demonstrated using a finite element analysis on a portion of a prototype milling machine tool located at the National Institute for Standards and Technology (NIST).
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