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Validation of calibration procedures for freeform parts on CMMs

Institut for Produktion og Ledelse, DTU
Publication Date
  • Mm03.42
  • Mathematics


The paper describes the validation of a new method for establishment of traceability of freeform measurements on coordinate measuring machines currently being considered for development as a new ISO standard. The method deals with calibration by: i) repeated measurements of a given uncalibrated workpiece in different orientations, ii) measurement of calibrated length and form standards, and iii) additional investigations with variation of measuring parameters. The feasibility of the method for the case of complex freeform geometries is documented through extensive experimental work involving calibration of local deviations on CMMs in two different laboratories, as well as of three different freeform items from industrial applications: a turbine blade, a screw compressor rotor and a bevel gear.

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