BRIEF MACHINE CHECKING FOR COORDINATE MEASURING SYSTEM USING X-RAY COMPUTED TOMOGRAPHY

Osamu Sato, Hiroyuki Fujimoto, Sonko Osawa, Makoto Abe, Toshiyuki Takatsuji

Abstract

Form and dimensional measurements using X-ray Com- puted Tomography (X-ray CT) are useful on product development, reverse engineering, production control and quality certification because X-ray CT system can get three dimensional volumetric data of the full body of the target object at one time. Generally, three dimensional coordinate measuring systems (CMSs), in which X-ray CTs are also included, have measurement space distorted by the kinematic and other factors. Therefore, the deformation of the measurement space should be compensated for precise dimensional measurement. Moreover, the compensation function should be checked occasionally. In case of a widely-used coordinate measuring machine (CMM), the mobile frame of the machine is stable over a long period. Therefore, it is not necessary to check whether the compensation function on the CMM works well or not so frequently. In comparison with a CMM, the mobile frame of an X-ray CT is less stable. Thus, the space deformation compensation function on X-ray CTs should be checked at shorter interval than that on CMMs in order to perform precise dimensional measurement using X-ray CTs. In this research, a brief machine checking method for an X-ray CT is proposed. Through the repeating checking, the assessment of the long-term stability of the mobile frame of an X-ray CT is demonstrated.

Keywords

X-ray CT, coordinate measuring systems, dimensional measurement, interim check

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IMEKO-TC14-2014-34.pdf

DOI

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IMEKO TC

TC14 - Measurement of Geometrical Quantities

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