Standards committees are developing standard test methods for the performance evaluation of 5-axis machining centers through the direct and indirect measurement of simultaneous motions of all five axes [1-2]. However, the compound effect of the geometric and servo control errors of all axes complicates the analysis of the measured data and the identification and separation of the individual error contributor(s). To better understand the effect of the individual errors on the measurement results, NIST is developing a multi-configuration five-axis Virtual Machine Tool (VMT) model.
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