Int. J. Metrol. Qual. Eng.
Volume 6, Number 1, 2015
|Number of page(s)||6|
|Published online||23 February 2015|
Influence of sample size on flatness estimation and uncertainty in three-dimensional measurement
Laboratoire de recherche (LaMIPI), Université Mohammed V- Rabat
(UM5R), ENSET de Rabat, Avenue de
l’Armée Royale, Madinat Al Irfane, 10100
2 Département Technologie des Polymères et Composites et Ingénierie Mécanique, Ecole des Mines de Douai, 764 Boulevard Lahure, 59500 Douai, France
Accepted: 12 January 2015
To respond correctly to its function in a mechanism, a mechanical part should have a good dimensional and geometric quality. In three-dimensional measurement, the preferred tool of control is currently the coordinate measuring machine CMM, the evaluation of flatness defect of a part is a very common task in this area, and the decisions made based on the measurement result may be outliers when the uncertainty of measurement result is not taken into account. The evaluation of uncertainty is a delicate task in this area given the diversity of parameters that relies in. The number of points collected on the surface is one of the influencing factors. The choice of this parameter is left to the operator, and the value taken by this parameter affects both the estimated flatness and the associated uncertainty. In this paper we present the effect of a number of points collected during the inspection of a surface on the estimated flatness and the associated uncertainty. A new identification method is presented here. The flatness deviation uncertainty is quantified by applying the law of propagation of uncertainties. The treated data sets are the result of experimental measurements performed on a CMM by measuring an industrial part.
Key words: CMM uncertainties / flatness and uncertainty / effect of sampling flatness
© EDP Sciences 2015
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