Construction of an error map of rotary axes on a five-axis machining center by static R-test |
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Authors: | Soichi Ibaraki Chiaki OyamaHisashi Otsubo |
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Affiliation: | a Department of Micro Engineering, Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto 606-8501, Japan b Otsubo Engineering Research Center, Yuno 266-1, Kannabe-cho, Fukuyama, Hiroshima 720-2121, Japan |
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Abstract: | This paper proposes an efficient and automated scheme to calibrate error motions of rotary axes on a five-axis machining center by using the R-test. During a five-axis measurement cycle, the R-test probing system measures the three-dimensional displacement of a sphere attached to the spindle in relative to the machine table. Location errors, defined in ISO 230-7, of rotary axes are the most fundamental error factors in the five-axis kinematics. A larger class of error motions can be modeled as geometric errors that vary depending on the angular position of a rotary axis. The objective of this paper is to present an algorithm to identify not only location errors, but also such position-dependent geometric errors, or “error map,” of rotary axes. Its experimental demonstration is presented. |
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Keywords: | R-test Five-axis machine tool Calibration Error motion Location error Error map |
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