Abstract
In the centerless grinding process, it happens on rare occasions that the workpiece rotation suddenly speeds up toward the peripheral velocity of the grinding wheel and, in the worst case, the workpiece jumps from the grinding area. This phenomenon called “spinners” sometimes causes the grinding wheel to burst. In this paper, the mechanism of spinner occurrence is discussed. The existence of safe-operation zone, where there is no risk of spinners, is presented with primary set-up conditions. This paper also describes friction characteristics of the regulating wheel that are the dominant factor in determining the safe-operation zone. The test results of friction coefficients of various regulating wheels are discussed, and the set-up guidelines to avoid the spinner problem are proposed.
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