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Acceptance and reverification of CMM in industrial conditions

Koteras Robert, Wieczorowski Michał, Znaniecki Piotr

Advances in Science and Technology. Research Journal

2018

Vol. 12, no 1

80--88

Nowadays, coordinate measuring machines (CMM) are featured by a great degree of complexity and high accuracy of manufacturing. During use of a machine, usually after periodical maintenance it is highly recommended to perform a verification test according to the same procedures as a standard verification test, including a difference that performance conformity is checked with user’s declaration. Periodical verification should be performed as often as it comes from a user’s experience and after every interference influencing mechanical and electronic systems of a CMM that could potentially cause a change in its accuracy parameters. The best solution is employing for that purpose an independent accredited laboratory that is featured by high competence and experience. In the paper rules of acceptance and periodical verifications are described, sources of measurement errors resulting from CMM imperfections are presented as well as examples of results for specific measurement devices installed in industry were shown.

Problemy związane z korekcją promienia końcówki pomiarowej podczas skaningowych pomiarów współrzędnościowych

Woźniak A., Mayer M., Cote M.

Pomiary Automatyka Kontrola

2007

R. 53, nr 9 bis

485--488

W artykule przedstawiono analizy teoretyczne i badania doświadczalne potwierdzające, że korekcja promienia końcówki pomiarowej może być istotnym źródłem błędów podczas saningowych pomiarów przeprowadzanych na maszynach współrzędnościowych. Przedstawiono wyniki pomiarów przykładowego elementu na maszynie Mitutoyo LEGEX 910 CMM wyposażonej w sondę skaningową MPP-300, ze wskazaniem mechanizmów złej korekcji promienia końcówki pomiarowej.

Paper discusses an understanding for the compensation of the probe ball radius in a scanning process carried out by coordinate measuring machines (CMM). According to some initial trials of scanning measurement using the stylus tip radius correction built-in the CMM software, it was found, as will be shown in the paper, that the indigenous CMM software do not compensate the stylus tip radius well. As a result, the information about the real shape of the measured reatures can be distored. The difficulties with the corrected measured point determination will be demonstrate no the basis of tests were carried out on a Mitutoyo LEGEX 910 CMM equipped with a MPP-300 scanning probe.