Abstract
A run-out measuring instrument with capacitance displacement probe is widely used in industry. However, this measurement method has the defect that measurement result depend on a feature of measured object. Furthermore, attachment error between measured object and spindle is never detected in measurement at are section. In this paper, we compare the optical measurement by virtual V-block method which does not depend on a feature of a measured subject to 2-point method with capacitance displacement probe in view of measurement principle. And we show how to separate the attachment error from the run-out error of a spindle.
