Abstract
In precision grinding operations, the force between wheel and work at which cutting ceases is called the Threshold Force. These forces often result in size errors; out-of-roundness of the workpiece; changes in surface finish, and contour errors in cam grinding. They are functions of the wheelspeed; the difference in curvature between wheel and workpiece; the work material; the wheel, and coolant. Methods for estimating the size error and surface finish error are presented. The influence of Threshold Forces on cycle time is illustrated. Optimum feedrates for rounding up eccentricity or form errors in workpieces are developed. Means for predicting contour errors in cam grinding are presented.
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