On an Apparatus Eliminating the Eccentric Effects for Measuring Cylindrical Part Roundness by Radius Method

Abstract

There are two cases for measuring the roundness of a cylindrical work ; one, that of a work with two center-holes on its sides and the other, that of one without a center-hole. For the latter case, the author previously published both the theory and the experimental results of the method based on the superposed chain rule, and made it clear that a precise test of roundness can easily be performed by the above method. Now, for the former case, we are hitherto obliged to do a considerable amount of labour for calculation to eliminate the eccentric terms caused by two center-holes, and so this case is apt to be avoided. In the present paper, in order to get rid of such inconvenience, the author proposes a new electronic method, and makes it clear that the eccentric effects of two center-holes can be simply eliminated and a precise test of roundness can easily be performed by this method.