| 摘要 |
PROBLEM TO BE SOLVED: To provide a grinding apparatus accurately calculating the roundness of a workpiece on machine. SOLUTION: Fourier transformation is executed to measurement data of a plurality of rotations of the workpiece, which are measured by a measuring device for continuously measuring the outer diameter of the workpiece during grinding or after grinding, for every one rotation of the workpiece. Coherence for each order is calculated on transformed data transformed by Fourier transformation. The calculated coherence for each order and a preset prescribed value are respectively compared with each other. The transformed data corresponding to the order of the coherence are averaged when the coherence reaches or exceeds the prescribed value. Regular data are calculated by executing Fourier inverse transformation regarding the transformed data. The roundness of the workpiece is calculated by the calculated regular data. COPYRIGHT: (C)2005,JPO&NCIPI
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