Fuzzy control is applied to the superfinishing in order to optimize the cutting ability of the stone. The finishing performance of vitrified bonded WA stone is regarded as the fuzzy goal. At the beginning of cutting, the stone is in the stage of cutting to get high stock removal rate. But the cutting ability is decreasing as the finishing proceeds and is lost at the end of finishing, resulting in getting the smooth surface. A cutting resistance is used to monitor the cutting condition of stone. The cutting ability of stone is controlled by both the stone pressure and the amount of electricity for electrolytic in-process dressing. A water-solution type coolant and metal bonded diamond stone are used. The main results obtained are as follows. Fuzzy control makes it possible to give the optimized cutting ability to the diamond stone. In the first case, it is possible to get the large stock removal following the smooth surface in a limited time. In second case, it is possible to minimize the finishing time in which the finishing performance intended in stock removal and surface roughness is obtained. In third case, it is possible to keep the cutting ability of stone constant for a long time.
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