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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