| 摘要 |
PROBLEM TO BE SOLVED: To provide a misalignment amount calculation method that enables calculation of a misalignment amount serving as a deviation amount between a generatrix of a measurement object and a detection point.SOLUTION: The misalignment amount calculation method in a circularity measurement device measuring a circularity of a measurement object comprises: means for linearly moving a detector in a predetermined direction with respect to the measurement object; a detection step for performing a measurement by, with respect to one reference measurement object 26-1 with a diameter value having the diameter value known, moving a tip ball 31a of the detector in parallel with a generatrix passing through a center of the reference measurement object 26-1 and serving as a linear line parallel with a direction where the detector horizontally and linearly moves and bringing the tip ball 31a into contact with the reference measurement object 26-1 at two detection points facing each other of the reference measurement 26-1, and detecting a measurement difference about the reference measurement object 26-1; and a misalignment amount calculation step for calculating a misalignment amount serving as a deviation amount between the generatrix of the reference measurement object 26-1 and the detection points on the basis of the measurement difference. |
