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| The present invention relates to a gauge for calibrating a three-dimensional coordinate measuring machine (CMM). This gauge, which is used in examining the accuracy of the CMM, enables total calibration of errors and numbers of revisions of the measured values. Moreover the accurate calibration with the invention is possible for the CMM of any size. A method for calibrating the CMM using the gauge is also presented in this invention.FIG shows fundamental structureof CMM calibrating gauge present invention integral sphere widely known block national standard whose end face length absolute value certified lightwave interferometer faces denoted reference numeral (the first face) second remaining called front surface side surfaces disposed done various spherical recess fitting fixing welding adhesive agent diameter smaller position either except protrude combined probe 21 (not shown) brought contact least three optional points measure planarity opposite values measured compared real calibrate graduations calibrated extremely accuracy arbitrary X-Y plane equator acquire coordinate positions Finally pole measurements mathematical calculation coordinates center distance basis two |
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