1. Grinding in the grinding rack refers to a smooth finish of the rack tooth surface. After processing, the precision can reach the standard of European standard 6 and the surface roughness can reach 1.6.

2. When grinding the tooth surface of the toothed rack, there are scattered fine-grained sand particles (abrasives and abrasives) on the surface of the grinding tool and the workpiece, and the pressure exerted between them is generated, and the complex relative motion is generated, so that the sand passes through The chemical and physical effects of grinding and abrasives remove a thin layer on the tooth surface to achieve high precision and small surface roughness.