| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of removing chucking whirling during measuring a roundness(R) accuracy while a ball end mill simplex includes tool whirling processed in the ball end mill itself, and accurately measuring the roundness(R) accuracy. SOLUTION: In the method of measuring the roundness(R) accuracy of the ball end mill, the ball end mill is substantially fixed, at least two or more arbitrary lines crossing a shank part are set, a virtual tool rotating shaft is determined based on a central value between each line and the outer diameter line of the shank part, the tip position of the ball end mill is determined, the center of the ball blade is determined, a point on the ridge of the ball blade is measured, the virtual tool rotating shaft is overlapped on an actual rotating shaft by a calculating process, a correction is performed at any time so that the central position of the ball blade is identical, and the R accuracy of the ball blade of the ball end mill is determined based on a difference between a value in the normal direction and the ideal radius of the ball blade.
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