National Physical Laboratory

CMM verification artefacts

CMM Verification

ISO 10360 strongly recommends that a coordinate measuring machine (CMM) be checked regularly during the periods between periodic re-verification.

Depending on the measurement tasks for which the CMM is used, the most relevant of the following commonly used artefacts should be chosen. Some examples are given below:

  • A purpose-made test piece that has features representing typical geometrical shapes, is dimensionally stable, mechanically robust, and which has a surface finish that does not significantly affect the uncertainty of measurement
  • A ball plate
  • A hole plate
  • A ball bar
  • A hole bar
  • A bar that can be kinematically located between a fixed reference sphere and the CMM probe-stylus sphere
  • A circular artefact (e.g. a ring gauge)

NPL can calibrate a number of these artefacts including purpose-made test pieces, ball plates, hole plates, ball bars, hole bars and ring gauges.

Please contact us so that we can discuss your requirements with you.


Customer Service tel: 020 8943 8631

Last Updated: 16 Oct 2014
Created: 30 Aug 2012


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