[ALUMINIUM NETWORK] For aluminum parts, the process that must be carried out before grinding and polishing is required depends on the surface conditions of the parts being polished. Some parts have been polished to a polished surface quality before being polished and lubricated, and there is no need to polish and shine, and rough polishing can be performed directly. The same is true of the polishing parts, and the parts are close to the polished surface quality, and the light or rough polishing can be performed directly.