High gloss and high precision grinding also requires a high accuracy and rigidity of the machine tool. The grinding process involves using finely trimmed grinding wheels to produce multiple micro cutting edges of equal height on each abrasive grain. With a small grinding depth and under appropriate grinding pressure, very fine chips are cut from the surface of the workpiece, plus the sliding, pressing, smoothing, and friction polishing effects of multiple non feed grinding stages when the micro cutting edge is in a micro state, Thereby obtaining a highly polished surface with high machining accuracy and good physical and mechanical properties.