The dimensional control on large parts generally requires measuring machines of very high cost of both purchase and maintenance. On the other hand measuring accuracies of such machines (of the order of few micrometers) are often in excess of what is required and execution times are very long. In this paper an optoelectronic measuring system, developed by Fiat Research Center and IVECO, devoted to the dimensional test of truck side frames is described. The system, which uses a CCD camera and a sophisticated optical system to assure a correct image on the sensor and avoid perspective errors due to the extent and thickness of the part, permits a very fast transversal axis measurement. The major axis measurement is performed in a standard way by an optical encoder. The system is able to control in diameter and position up to 500 holes on U shaped side frame, of maximum dimension of 10x0.5 m2, in less than two minutes and with an accuracy of a few tenths of a millimeter.

Media Info

  • Features: Figures; References;
  • Pagination: p. 725-736

Subject/Index Terms

Filing Info

  • Accession Number: 00393210
  • Record Type: Publication
  • Source Agency: National Highway Traffic Safety Administration
  • Report/Paper Numbers: HS-037 275
  • Files: HSL, USDOT
  • Created Date: Mar 29 1985 12:00AM