Use a grinding wheel or grinding wheel purchase, you need to select with and the things that you need to wear when the grinding wheel to achieve good results, the following simple exposition to choose the granularity of the wheel:
F6-F16: for rough grinding, snagging and grinding burr grinding wheel.
F20-F26: Felsteel, grinding castings burr cut steel Pooh, grinding porcelain and refractory grinding wheel.
F40-F60: for internal grinding, cylindrical grinding, surface grinding, centerless grinding, tool grinding, cutting wheel.
F60-F80: for internal grinding, cylindrical grinding, surface grinding, centerless grinding, grinding tools, grinding wheel of a semi-fine grinding and fine grinding.
F100-F220: for fine grinding, fine grinding, fine grinding, mirror grinding.
F800 finer: for fine grinding, cutting, and other ultra-fine grinding, mirror grinding, monocrystalline silicon wafers, the production of abrasive paste for grinding and polishing.