Mechanical polishing for MIM parts advantage is that the processed parts have good levelness and high brightness. The defect is that the labor intensity is high; the pollution is high; complex parts cannot be processed and their gloss cannot be consistent. The gloss maintenance time is not long, easy rusty. It is suitable for simple parts, medium and small products.

Mechanical polishing is a polishing method which relies on cutting to get a smooth surface. Generally, it uses oilstone strips, wool wheels, abrasive paper, etc.. Manual operation is the main process. Special parts such as with revolving body surface can use assistant tools such as turntable. High surface quality requirements can be achieved by ultra-precision polishing. Ultra-precision polishing is a special abrasive tool. The surface roughness of Ra 0.008 um can be achieved by this technology, which is the highest among all polishing methods. This method is often used in optical lens metal injection molds.