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4. Measuring geometric errors
Determining one or more of these errors is necessary in the following cases:
during initial CMM assembly;
after moving the CMM;
after a maintenance operation ;
when creating or modifying the error correction matrix.
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Types of geometric error: for a CMM, there are 21 basic parameters:
positioning accuracy and hysteresis (1 parameter per axis) 3
orthogonality (1 parameter per plane) 3
translation: straightness deviations (2 parameters per axis) 6
rotation: yaw, pitch, roll (3 parameters per axis) 9
Total:...
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Measuring geometric errors
References
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
- 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...
Manufacturers
(Non-exhaustive list)
Laboratoire National d'Essais LNE - http://www.lne.fr/
Koba (distributed by Blet - http://www.blet-mesure.fr )
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