1. Preliminary remark: expansion

Both the CMM and the product being measured undergo expansion and deformation as their temperature changes.

If the shape of the product is simple, it expands as its temperature rises, with a variable inertia depending on its exchange surface.

CMMs, which are often assembled from a variety of materials, expand, on the one hand with an inertia that differs from that of the product, and on the other hand by deforming, since thermal variations are rarely homogeneous throughout the machine volume.

When the thermal regulation of the room where the machine is installed is not compatible with the expected performance, this induces phenomena, the most serious of which seems to be the rapid and significant degradation of the CMM's geometric qualities, which can lead to the elimination of correct parts or the acceptance of...

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Preliminary remark: expansion

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page Control of measuring machines

Verification of metrological performance

References

(1) - Foundations of mechanical accuracy. - The Moore Special Tool Company. (1970).
(2) - KNAPP (W.), TSCHUDI (U.), BUCHER (A) - Metrology Standards News. Comparison of different artefacts for interim coordinate measuring machine checking. -...

Theses

- http://www.sudoc.abes.fr
BACHMANN (J.) - Contribution à la propagation des incertitudes dans les gammes de mesure des machines à mesurer par coordonnées. - Université d'Aix-Marseille 2. Faculté des Sciences...

Standardization

AFNOR Association Française de Normalisation

http://www.afnor.fr

Méthodes de mesurage dimensionnel. Deuxième partie. Écarts de rectitude - NF E 10-101 - 2.88
Spécification géométrique des produits (GPS). Vérification par la mesure des pièces et équipements de mesure. Partie 1 : règles de décision pour prouver la conformité ou la non-conformité...