National Physical Laboratory

I need to calibrate my CMM, or do I mean verify it or error map it or qualify it? I am confused. (FAQ - Length)

A manufacturer will calibrate a CMM and produce an error map that corrects for the various geometric errors in the machine.

When delivered an acceptance test will be carried out on the machine to verify that it meets its specification. This verification should be repeated periodically to check that the machine is still within specification (reverification). In addition interim checks should be carried out.

When using the machine the probing system will need to be qualified by measuring a material standard of known dimension (usually a reference sphere).

For more information see ISO 10360.

International Standard ISO 10360 covers CMM verification. This standard has six parts:

  • ISO 10360-1: 2000 Geometrical Product Specifications (GPS) - Acceptance and reverification tests for coordinate measuring machines (CMM) - Part 1: Vocabulary
  • ISO 10360-2: 2009 Geometrical product specifications (GPS) - Acceptance and reverification tests for coordinate measuring machines (CMM) - Part 2: CMMs used for measuring linear dimensions
  • ISO 10360-3: 2000 Geometrical Product Specifications (GPS) - Acceptance and reverification tests for coordinate measuring machines (CMM ) - Part 3: CMMs with the axis of a rotary table as the fourth axis
  • ISO 10360-4: 2000 Geometrical Product Specifications (GPS) - Acceptance and reverification tests for coordinate measuring machines (CMM) - Part 4: CMMs used is scanning measuring mode
  • ISO 10360-5 :2010 Geometrical Product Specifications (GPS) - Acceptance and reverification tests for coordinate measuring machines (CMM) - Part 5: CMMs using multiple-stylus probing systems
  • ISO 10360-6 :2001 Geometrical Product Specifications (GPS) - Acceptance and reverification tests for coordinate measuring machines (CMM) - Part 6: Estimation of errors in computing Gaussian associated features

In addition, ISO/TS 23165: 2006 Geometrical product specifications (GPS) - Guidelines for the evaluation of coordinate measuring machine (CMM) test uncertainty provides guidance on how to calculate the uncertainty of measurement associated with the test.

The following parts of the standard are currently under development as of April 2011:

  • ISO 10360-7 Geometrical product specifications (GPS) - Acceptance and reverification tests for coordinate measuring machines (CMMs) - Part 7: CMMs equipped with imaging probing systems
  • ISO/CD 10360-8 Geometrical product specifications (GPS) - Acceptance and reverification tests for coordinate measuring machines (CMM) - Part 8: CMMs with optical distance sensors
  • ISO/DIS 10360-9 Geometrical product specifications (GPS) - Acceptance and reverification tests for coordinate measuring machines (CMM) - Part 9: CMMs with multiple probing systems
Last Updated: 9 Aug 2012
Created: 1 Dec 2010

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