A comprehensive technique for measuring the three-dimensional positioning accuracy of a rotating object

摘要

A method for measuring the accuracy of rotating objects was studied. Rotating axis errors aresignificant; such as the spindle error of a machine tool which results in increased surface roughness ofmachined work pieces. Three capacitance-type displacement sensors were used to measure theposition of a rotating master ball. The sensors were mounted at the three orthogonal points on thespindle axis. The measurement data were analysed for rotating spindle accuracy, not only for theaverage roundness error but also for the spindle volumetric positional error during rotation. Thismethod is simple and economical for industrial field use for regular inspection of spindles usingportable equipment. The time taken for measurement and analysis using this method is only about twohours. This method can also measure microscopic amplitudes in 3-D directions of vibrating objects.