Measuring Sphericity on a Roundness Gage

摘要

The three-dimensional geometry of a spherical object may be determined by evaluation of a number of two-dimensional roundness measurements which have a known orientation with respect to one another. A suitable set of orientations appears to be one in which the plane of each roundness measurement coincides with every other such plane along a single diameter of the sphere. A device for producing the required set of orientations, adaptable to spheres of varying diameters and designed to avoid damage to delicate materials, has been developed and tested. (ERA citation 06:014624)