According to the structure of the machine and the need for grinding, grinding wheel made of various shapes and sizes. Table 6 is commonly used in several wheel shape, size, code and use. The outer diameter of the grinding wheel should be chosen as much as possible in order to improve the wheel's peripheral speed, so to improve the productivity of grinding and surface roughness favorable. In addition, in the machine stiffness and power permit conditions, such as the choice of a larger width of the wheel, the same can be received to improve productivity and reduce the effect of roughness, but the grinding of high-sensitivity materials, in order to avoid surface burns and Resulting in cracks, grinding wheel width should be appropriately reduced.