Overview
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Read the articleAUTHORS
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Pierre BOURDET: Professor emeritus at the Ecole Normale Supérieure de Cachan
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Claire LARTIGUE: Professor at Paris-Sud University
INTRODUCTION
In the field of macro-geometric dimensional control, coordinate-based coordinate measuring machines (CMMs) came into their own in the 1970s. Classically, they are essentially composed of a mechanical structure guiding a mechanical probe which, on contact with a surface, electronically triggers the measurement of its position in a Cartesian coordinate system. CMMs can thus provide a "digital image" of a physical object's surfaces, based on a set of point clouds. Software processing of the information acquired in this way enables the measurement of dimensional and three-dimensional geometrical characteristics, which can comply with various ISO-GPS (Geometrical Product Specification) standards.
Over the last ten years or so, CMMs have undergone a new technological evolution, linked to the use of increasingly high-performance non-contact optical measurement sensors. It is now more appropriate to speak of "3D measurement systems", in which coordinate CMMs make their contribution to a highly diversified technological offering in which the CMM itself can be replaced by an optical measurement system (optical CMM).
After outlining the main criteria for choosing a 3D measurement system, we'll focus more specifically on the technologies associated with coordinate CMMs, providing the metrological foundations common to the various systems.
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Mechanical and dimensional measurements
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Bibliography
Digital media
PDF – M.A.V. Chapman, R. Furgusson-Kelly, A. Hommoway, W. Lee, Interferometric angle measurement and the hardware options available from Renishaw, Technical white paper : TE326 Renishaw.
PDF – M.A.V. Chapman, Calibration_of_machine_squareness, Technical white paper:
PDF...
Websites
(pages consulted June 2016)
Hexagon Metrology, Products http://www.hexagonmetrology.fr/Produits_98.htm#.V3D3yVfjjJY
Renishaw, Industrial metrology section http://www.renishaw.fr/fr/1030.aspx
...Standards and norms
- ISO Spécification géométrique des produits (GPS) : Essais de réception et de vérification périodique des MMT, Partie 1 : Vocabulaire. - NF EN ISO 10360-1 - 2001
- ISO Spécification géométrique des produits (GPS) : Essais de réception et de vérification périodique des MMT, Partie 2 : MMT utilisées pour les mesures de dimensions linéaires. - NF EN ISO 10360-2 - 2010
- ISO Spécification géométrique des produits...
Directory
Organizations – Federations – Associations (non-exhaustive list)
Collège français de métrologie (CFM), Paris : http://cfmetrologie.com
Documentation – Training – Seminars (non-exhaustive list)
Journée technique Collège français de métrologie. How to guarantee measurement quality on your CMM? Jean-Marc Pras, EUROTEK,...
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