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Assessing measurement uncertainty in CMM measurements: comparison of different approaches

  • S. Ruffa, G.D. Panciani, F. Ricci and G. Vicario

Abstract

Manufactured parts are affected by size and form errors, which need to be assessed against geometrical and dimensional tolerances in order to meet the functional requirements they have been conceived for. The compliance assessment of workpieces with specifications depends on measurements and is unavoidably affected by several uncertainty contributions. According to the geometrical product specifications and verification (GPS), measurement uncertainty consists of method and implementation uncertainty. Literature proposes different approaches for the evaluation of implementation uncertainty, however a standardized method has not been yet achieved. This paper makes an analysis of the various elements to be considered when choosing a specific approach: in the implementation uncertainty of circular features. The most common manufacturing signatures affecting circular profiles were considered, together with the number of points necessary for a reliable estimation of implementation uncertainty.

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Corresponding author

Correspondence: suela.ruffa@polito.it

References

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[1] Srinivasan, V., Standardizing the specification, verification, and exchange of product geometry: Research, status and trends, Comput. Aided Des. 40, 738749 (2008)
[2] ISO 12181-1, Geometrical product specifications (GPS) – Roundness – Part 1: Vocabulary and parameters of roundness (2011)
[3] ISO 12181-2, Geometrical product specifications (GPS) – Roundness – Part 2: Specification operators (2011)
[4] Desta, M.T., Feng, H.-Y., OuYang, D., Characterization of general systematic form errors for circular features, Int. J. Mach. Tools Manufact. 43, 10691078 (2003)
[5] ISO 11562, Geometrical Product Specifications (GPS) – Surface texture: Profile method – Metrological characteristics of phase correct filters (1996)
[6] Changcai Cui, S.F., Fugui, H., Research on the uncertainties from different form error evaluation methods by CMM sampling, Int. J. Adv. Manuf. Technol. 43, 136145 (2009)
[7] Efron, B., Bootstrap Methods: Another Look at the Jackknife, Ann. Statist. 7, 126 (1979)
[8] JCGM 100, Evaluation of Measurement Data – Guide to the Expression of Uncertainty in Measurement (GUM, 2008)
[9] Farooqui, S.A., Doiron, T., Sahay, C., Uncertainty analysis of cylindricity measurements using bootstrap method, Measurement 42, 524531 (2009)
[10] ISO 17450-2, Geometrical product specifications (GPS) – General concepts – Part 2: Basic tenets, specifications, operators, uncertainties and ambiguities (2012)
[11] Cho, N., Tu, J., Roundness modeling of machined parts for tolerance analysis, Precis. Eng. 25, 3547 (2001)
[12] Henke, R.P. et al., Methods for evaluation of systematic geometric deviations in machined parts and their relationships to process variables, Precis. Eng. 23, 273292 (1999)

Keywords

Assessing measurement uncertainty in CMM measurements: comparison of different approaches

  • S. Ruffa, G.D. Panciani, F. Ricci and G. Vicario

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