By coating or pressure of the abrasive disc  particles embedded in the lap, the finishing processing (such as cutting) on the processing surface by the relative movement of the lap and the workpiece under a certain pressure. Polishing the surface shape can be used for processing a variety of abrasive tools and nonmetallic materials processing flat, within the outer cylindrical and conical surface, convex, concave spherical, thread, the tooth surface and the other type of surface. Machining accuracy up to the IT5 ~  01 surface roughness up to Ra0.63 ~  0.01 microns.

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Grinding is a very complex process, so it has not yet formed an everything the grinding wheel  phenomenon unified theory after long-term observation and research, mainly there are three:
The mechanical grinding theory: that the cerium oxide particles, cutting with the CG cutting of the abrasive wheel  particles.
The chemical action Theory: protrusion peak portion of the glass serrated layer is removed by hydrolysis.
Hot surface flow theory: the frictional heat caused by hot melt flow, resulting in a smooth surface.