円周分割誤差の一測定法について
1973 年 39 巻 463 号 p. 836-839
詳細
1973 年 39 巻 463 号 p. 836-839
The purpose of this paper is to show a new method of accurate measurement of the circular dividing error. In this method, a pair of circular scales are calibrated at a time without any standard, by means of relative measurement of these two scales. First, a pair of circular scales which have the same number of graduations are arranged concentrically, and a series of measurements of the little angles between the corresponding graduations of these scales are made. Then, one of the pair is turned at a certain angle so as to change the relative angular position between two scales properly, and a series of measurements of the little angles between the new corresponding graduations of these scales are made samely. The accuracies of the scales are estimated from two series of measurements. This method is applicable to the measurements of graduation errors of circular scales and other similars. Here, the applications are made to the measurements of facet angle errors of polygon mirrors with the accuracy of the measurement 0.2 seconds of arc, pitch errors of spur gears with the accuracy 1.5 seconds and indexing errors of worm gears with the accuracy 2 seconds transforming the angle to the time, dynamically.
