speed as the grinding wheel. Doing so breaks the bond between the abrasive particles on the surface of the wheel, exposing a new surface as particles fall away. One disadvantage is that the wheel profile cannot be adjusted except by replacing the roll with one having a different profile. Diamond dressing rolls — a diamond dressing roll is a dressing roll coated with diamond particles. It wears more slowly and less wear mean they can be used to achieve tighter tolerances than plain crush rolls. Rotary dressers — a rotary dresser (sometimes referred to as a pizza-cutter dresser) is a disc with a hard material - usually diamond - attached to the edge. The grinding wheel's profile has a specific radius size and is controlled by the CNC program used to dress the wheel, rather than by the profile of the dresser itself. Wheel Conditioning Proper wheel conditioning is a critical part of any grinding process. The condition of the wheel will determine the wheel's ability to meet the part finish requirements and metal removal rate capabilities. The grains in the wheel can be sheared to create a smooth condition or fractured to create a course open condition utilizing dressing parameters. Truing the wheel and restoring the form will happen simultaneously while you are conditioning the wheel. Conditioning a wheel with a stationary tool or a rotary dresser/pizza cutter are the same if you are working with a known radius tip. When using a stationary tool or a rotary dresser, the traverse rate across the wheel face will determine the wheel condition. Slower rates give a finer finish and faster rates give a courser finish. Conditioning the wheel with a shaped diamond dressing roll requires the roll to be plunged into the grinding wheel at a predetermined speed and infeed rate. Controlling the speed ratio and infeed rates are a critical part of acquiring and maintaining the desired wheel condition. Counter-Directional dressing will sheer the grains and create a smooth wheel face. Uni-Directional dressing will fracture the grains and create a rough wheel face. Skate sharpening Grinders used for sharpening skate blades typically have one or more thin grinding wheels mounted on vertical spindles, with a single-diamond dresser mounted on a gymbal with a horizontal axis level with the centerline of the wheel, so it can swing above and below the plane of the wheel, producing a convex grinding surface