Stationary and motorized machine used to shape or model solid materials, specially metals. The modelling is achieved removing part of the material from the piece o stamping it with a determined shape. They are the base of modern industry and are used direct or indirectly to make machine pieces and tools. The grinding machine is a tool machine, used to make abrasion machining, with better dimensional precision and less roughness than in the shaving tears machining. The ground pieces are mainly steel hardened through thermal treatment. For the grinding robust abrasive discs are used, called belt grinders. The grinding is applied after the piece has been put under other tool machines that have removed the main impurities, leaving only a small excess of material to be

The grinding purpose is to correct the geometrical and dimensional imperfections produced during the pieces manufacturing operations, either by machining or thermal treatment.