Uncertainties in CMM Measurements, Control of ISO Specifications

J. Sprauel (1) , J. Linares (1) , J. Bachmann (1) , P. Bourdet (2)

1 MECASURF - Mécanique des Surfaces (EA4496)
2 ENS Cachan - École normale supérieure - Cachan

In the scope of quallty control, accurate evaluatlon of measurement uncertalntles is a real challenge to Improve the use d Coordlnate Measurlng Machlnes (CMM). In our work, a new method, based on a statistical approach of the problem, was therefore developed, to deduce instantaneous measurement uncertainties directly from the set of acquired coordinates. The covariance matrix of the intrlnsic parameters whlch characterize each analyzed surface Is also evaluated, thus allowlng an accurate propagatlon of the measurement uncertainties to the ISO specifications to be controlled. The experiments carried out in our study illustrate thls new statistical approach and demonstrate its relevance.

Keywords: Coordinate measuring machine; Uncertainty; Statlstlcal

Domains: Engineering Sciences [physics]; Mechanics [physics.med-ph]; Mechanical engineering [physics.class-ph]; Engineering Sciences [physics]; Chemical and Process Engineering

J. Sprauel, J. Linares, J. Bachmann, P. Bourdet. Uncertainties in CMM Measurements, Control of ISO Specifications. CIRP Annals - Manufacturing Technology, 2003, 52 (1), pp.423-426. ⟨10.1016/S0007-8506(07)60616-7⟩. ⟨hal-01408960⟩