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A grinder is a widely used abrasive processing process in which a spinning wheel is covered with coarse grains. Cutting pieces of metallic or non-metallic substances from a workpiece to make the surface flat or smooth.

A grinding wheel is a tool for grinding. It is composed of coarse-grained abrasive compounds bonded together. After forming a solid round object, grinding and abrasive processing can be performed on a grinding machine. Grinding is a commonly used processing method, which can obtain higher workpiece density and surface quality. Different grinding methods will produce different grinding defects. The most influential factor is the grinding wheel.