Novel CMM-based implementation of the multi-step method for the separation of machine and probe errors

Coordinate measuring machines (CMMs) are subject to periodic verification to ensure measurement capability. However, users also need to rapidly diagnose the source of accuracy degradation to guide corrective actions. This paper presents a novel CMM-based implementation of the multi-step method for the separation of machine and reference sphere errors on one side and triggering probe and probe tip errors on the other. The procedure uses multiple redundancy probing of the machine's own reference sphere and result in a mathematical system similar to that of the multi-step method. The procedure's effectiveness is demonstrated for a variety of stylus lengths and shows its ability to detect changes in lobing errors. A metrological validation is conducted by measuring the errors of the probe and errors of the machine using independent methods.

[1]  Adam Wozniak,et al.  Factors influencing probing accuracy of a coordinate measuring machine , 2005, IEEE Transactions on Instrumentation and Measurement.

[2]  C. Evans,et al.  Uncertainty estimation for multiposition form error metrology , 1997 .

[3]  Paulo Augusto Cauchick Miguel,et al.  A review on methods for probe performance verification , 1998 .

[4]  C. Butler,et al.  An investigation into theperformance of probes on coordinate measuring machines , 1991 .

[5]  Qingping Yang,et al.  Dynamic error characteristics of touch trigger probes fitted to coordinate measuring machines , 1998, IEEE Trans. Instrum. Meas..

[6]  Marek Dobosz,et al.  Metrological feasibilities of CMM touch trigger probes Part II: Experimental verification of the 3D theoretical model of probe pretravel , 2003 .

[7]  D G Chetwynd,et al.  Improving the accuracy of roundness measurement , 1976 .

[8]  R. Ryan Vallance,et al.  Nanometer-Level Comparison of Three Spindle Error Motion Separation Techniques , 2006 .

[9]  David J. Whitehouse,et al.  Some theoretical aspects of error separation techniques in surface metrology , 1976 .

[10]  Robert J. Hocken,et al.  Self-Calibration: Reversal, Redundancy, Error Separation, and ‘Absolute Testing’ , 1996 .

[11]  Steven D. Phillips,et al.  Error compensation for CMM touch trigger probes , 1996 .

[12]  J. R. RenéMayer,et al.  3D characterisation, modelling and compensation of the pre-travel of a kinematic touch trigger probe , 1996 .

[13]  Cao Linxiang,et al.  The measuring accuracy of the multistep method in the error separation technique , 1989 .

[14]  K. J. Stout,et al.  Some performance characteristics of a multi-axis touch trigger probe , 1997 .

[15]  W. Estler,et al.  The estimation of measurement uncertainty of small circular features measured by coordinate measuring machines , 1998 .

[16]  Marek Dobosz,et al.  Metrological feasibilities of CMM touch trigger probes. Part I: 3D theoretical model of probe pretravel , 2003 .

[17]  G N Peggs,et al.  Development of virtual coordinate measuring machines incorporating probe errors , 1998 .