THIS PAPER PRESENTS THE GRINDING PERFORMANCE DIFFERENCES OF TWO TYPES OF MONOCRYSTALLINE CBN PRODUCTS AND A MICROCRYSTALLINE CBN PRODUCT USING AN ELECTROPLATED WHEEL IN GRINDING HARDENED TOOL STEEL AND TWO DIFFERENT SUPERALLOY MATERIALS. THE PRODUCT PERFORMANCE COMPARISON WAS BASED ON POWER CONSUMPTION, SURFACE FINISH AND RATE OF WHEEL WEAR OBTAINED IN REMOVING MATERIAL IN THE ABSENCE OF WORKPIECE BURN. A SCANNING ELECTRON MICROSCOPE WAS USED TO ANALYZE THE WHEEL SURFACE TO UNDERSTAND THE WEAR BEHAVIOR OF THE DIFFERENT CBN TYPES.