If there is an excessively deep mark on the surface of the workpiece during polishing, some people will take extra polish pressure in an attempt to throw away the track marks. This does not help to injure parts and make the surface dark. Burnt marks. This phenomenon will appear more obvious after chemical polishing, showing a creamy, milky spot, and will remain after anodization. In order to avoid this phenomenon, in addition to properly reduce the peripheral speed of the polishing wheel, it is necessary to add appropriate amount of polishing paste at the same time, reduce the contact pressure between the workpiece and the polishing wheel, and continuously change the polishing wheel and workpiece. Measures such as the contact area between them are prevented.