A new method for thread calibration on coordinate measuring machines

Simone Carmignato, Leonardo De Chiffre

    Research output: Contribution to journalJournal articleResearchpeer-review


    CIRP Annals – Paper proposal temporary reference: P15. This paper presents a new method for the calibration of thread gauges on coordinate measuring machines. The procedure involves scanning of thread profiles using a needle-like probe, achieving traceability by substitution of different thread portions with corresponding paths on a calibrated sphere. The feasibility of applying the method to calibrate a parallel thread gauge with respect to all the relevant thread parameters was demonstrated experimentally using a precision CMM. Application of the comparator approach as described in ISO 15530-3 gave measuring uncertainties comparable to the values from usual calibration methods on dedicated equipment, e.g. a measuring uncertainty of 1.5 µm was achieved for measurement of the pitch, and 2-2.5 µm for diameter measurements.
    Original languageEnglish
    JournalC I R P Annals
    Issue number1
    Pages (from-to)447-450
    Publication statusPublished - 2003


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