A New Method of Roundness Measurement by Capacitive Detectors

摘要

A high precision technique for roundness measurements of nearly cylindrical mechanical parts by the use of capacitive detectors was developed. The general problems encountered in roundness measurements and the limitations of existing systems are presented. The apparatus and test results are described. A 3 mm radius cylinder was measured with a relative accuracy of 0.0001. Theoretically the method makes it possible to determine the exact roundness of an unknown section.