Method for Measuring Cylindrical Part Roundness

Abstract

There are two cases for measuring the roundness of a cylindrical work ; the one for the work with two centre-holes on its sides and the other for one without a centre-hole. For one of the latter cases, the author previously published both the theory and the experimental results of the method based on the chain rule in which he regarded the circumference of the work as a series of straight lines. In that case, measurement was performed with regard to a set of finite points on the circumference, not performed with regard to the other points, and so, if we take other sets of the finite points, we can expect to obtain more precise results. In this paper, he gives both theory and experimental results of a new measuring method developed from the above standpoint, and examines whether it is practically applicable, and makes it clear that a precise test of roundness can easily be performed by this method.