The Evaluation Method of Uncertainty of Contact R-Test on-Machine Calibration Combined the GUM and MCM
R-Test is widely used in the measurement of rotation axis error of five axis CNC machine tools owing to the advantages of high precision and high efficiency,but its measurement accuracy is affected by calibration uncertainty.An evaluation method of uncertainty of contact R-Test on-machine calibration combined the GUM and MCM is proposed based on the calibration prin-ciple,considering that the original general evaluation method cannot accurately evaluate the calibration uncertainty of contact R-Test.The influencing factors of the uncertainty are analyzed and the sensitivity coefficient is determined by the variable parame-ter method.Then,the standard uncertainty component of the sensor position is calculated according to the Guide to the Expression Uncertainty in Measurement(GUM).Finally,the Monte Carlo Method(MCM)is adopted to evaluate the final uncertainty of the calibration method.Through a specific evaluation example and comparison with GUM evaluation results,this method is verified to have higher evaluation accuracy.
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