Importance

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Abstract

An apparatus for measuring the out-of-roundness of a cylindrical workpiece. The apparatus provides a plurality of parallel light beams in a direction perpendicular to a plane of the longitudinal axis of the cylindrical workpiece. The workpiece intersects a first portion of the light beams. A second portion of the light beams is obstructed. A third portion of the light beams passes between the cylindrical workpiece and the structure obstructing the second portion. A fourth portion of the light beams passes beyond a surface of the cylindrical workpiece opposite the surface in spaced apart relation with respect to the obstruction structure. The cylindrical workpiece is rotated about the longitudinal axis thereof. An electrical signal is provided representing a dimension of the first portion of the light beams intersected by the cylindrical object during rotation thereof. A second electrical signal is provided representing a dimension of the third portion of the light beams passing between the cylindrical object and the obstructing structure. These electrical signals are summed to provide a continuous electrical signal representing the difference between the first two signals. A fourth continuous electrical signal is provided representing a magnitude of any change in the third electrical signal to indicate the magnitude of any out-of-roundness of the cylindrical workpiece.

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First Claim