Abstract
Among the important check items of the profiles of the male and female screw surfaces of a ball screw, the outside and core diameters of the screw spindle, the inside and core diameters of the nut, and the pitch can be measured by the same procedure as for the ordinary triangular thread. The theory and the practical method of the measurement of the ball center locus diameter were reported in last two parts of the report.
Here, the measurement of the contour of the screw surface by the optical procedure, the precise correction method and the approximate correction method of the observed value are discussed.
