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Conventional abrasive stones are made of aluminum oxide and silicone carbide, which operate in conjunction with conventional mineral-based oil as the cutting fluid. With "super-abrasives" such as diamond or borzon (CBN), either conventional oil-based fluids or water-based cutting fluids may be used. The water-based fluid minimizes the heat distortion from the cutting process itself, which can definitely aid the finished bore's accuracy. View Related Article
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