In this study clusters of resin bonded and metal bonded diamond wheels were dressed by lapping with GC abrasive grains. GC grain sizes at varying pressures were investigated to determine the effects of these various dressing processes. The main results obtained are: (1) Effects of the GC grain sizes and pressures on the protrusion height of the diamonds, the ratio of the fractured diamond grains, and the rate of the fractured areas are cleared quantitatively. (2) The method of lapping is effective not only for roughing the diamond grains to protrude from the bended surface but it is also effective in sharpening the worn and flat diamond grains under suitable conditions.
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