Random and Systematic Errors Share in Total Error of Probes for CNC Machine Tools
2. Materials and Methods
3.1. Tests in the Laboratory
3.2. Tests on the Machine Tool
- the measured radial distance in a given point, for a given direction i; and
- the radius of the best-fitted circle
- in the case of three-point (touch-trigger) kinematic probes, systematic errors are greater than random errors. Even in the on-machine measurement, when machine tool’s errors are present, the largest part of the probing errors can be the one resulting from the probe’s systematic errors. It means that numeric correction or compensation of kinematic probes’ systematic errors can significantly reduce errors of on-machine measurements. However, to apply this solution, systematic errors of the probe have to be known—mapped or modelled.
- in the case of the precise, strain gauge probe, systematic errors are not significantly greater than random errors. Thus, probe correction or compensation of systematic errors would not give significant benefit.
- The unidirectional repeatability value, usually provided by the probes’ manufacturers, is not sufficient to estimate the accuracy of the probe. For the kinematic probes tested in the laboratory, the one with the largest random errors still has systematic errors at least twice as large.
Conflicts of Interest
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Wozniak, A.; Jankowski, M. Random and Systematic Errors Share in Total Error of Probes for CNC Machine Tools. J. Manuf. Mater. Process. 2018, 2, 17. https://doi.org/10.3390/jmmp2010017
Wozniak A, Jankowski M. Random and Systematic Errors Share in Total Error of Probes for CNC Machine Tools. Journal of Manufacturing and Materials Processing. 2018; 2(1):17. https://doi.org/10.3390/jmmp2010017Chicago/Turabian Style
Wozniak, Adam, and Michal Jankowski. 2018. "Random and Systematic Errors Share in Total Error of Probes for CNC Machine Tools" Journal of Manufacturing and Materials Processing 2, no. 1: 17. https://doi.org/10.3390/jmmp2010017