CBN WHEELS ARE LESS READILY TRUED/DRESSED, AND THEIR INITIAL EDGE SHARPNESS RIGHT AFTER BEING TRUED/DRESSED IS OFTEN UNSATISFACTORILY LOW. IN THIS STUDY, A DRESSER HAS BEEN DEVELOPED FOR DRESSING AND TRUING CBN WHEELS OF BOTH VITRIFIED BOND AND ELECTROPLATED TYPE AND ALSO FOR TRUING RESIN BOND AND METAL BOND CBN WHEELS, AND THE OPTIMUM TRUING/DRESSING CONDITIONS FOR THAT DRESSER HAVE BEEN DETERMINED. A MAJOR CHARCTERISTIC FEATURE OF THE DRESSER IS THE ABILITY TO CONSISTENTLY PRODUCE WHEEL SURFACES HAVING UNIFORM HIGH SHARPNESS WITHOUT DISTURBING THE NORMAL GRINDING-AND-DRESSING PRODUCTION CYCLES.