Patent ID: 8348728

Claim:
A grinding wheel comprising: a core, wherein the core includes a first end surface, a second end surface, and a first radial section, wherein the first radial section has a first thickness that extends from the first end surface to the second end surface; a grinding layer formed on an outer circumferential surface of the core, wherein the grinding layer is outwardly adjacent to the first radial section in a radial direction, and the grinding layer has a second thickness; a slippery coating film, wherein the slippery coating film is formed on a portion of the first end surface that corresponds to the first radial section and on a portion of the second end surface that corresponds to the first radial section, wherein the portion of the first end surface that corresponds to the first radial section and the portion of the second end surface that corresponds to the first radial section are brought into contact with foreign matter during an operation of the grinding wheel and the slippery coating film prevents attachment of the foreign matter to the grinding wheel, wherein the second thickness is greater than a combination of the first thickness, a thickness of the slippery coating formed on the portion of the first end surface that corresponds to the first radial section, and the thickness of the slippery coating formed on the portion of the second end surface that corresponds to the first radial section.