HW1__Trịnh Việt Anh_ Grinder The 2 stone grinder is one of the most essential tools in industry.Two stone grinders often operate at high speeds so it is quite dangerous in using process. Risk unsafe : + Manufacturing components and structures: Motion mechanism, shaft, transmission coupling, jig, translational movement parts. + Throwing: Tool pieces, machining materials are splashed out such as cutting tools, grinding wheels, workpieces, workpieces, bavia when cleaning the part ... + Electric shock: electric shock to the cabinet, from wires, electrical switches, electrical outlets ... + Burns: Hot metal, material heated by friction. + Matches: The screw heads on the milling table, the graders and the convex protrusions cause trauma. Common accidents with grinders: + Metal dust and stone dust can shoot out in all directions, which can get into the eyes of workers or fly out, pollute the air easily penetrate into the lungs, leading to pneumoconiosis. + While grinding by hand, the hand may touch the grinding wheel, causing injury. + Fragments of abrasive stones can cause damage to workers at the grinding station or nearby workers. Safety measures for workers when operating the grinder: + There are manuals, step-by-step operating procedures of the machine. + Warning boards, illustrations picture of dangerous parts that are not in contact. + The operator must wear full protective equipment such as glasses, masks ... and not face the stone when grinding. + The local lighting voltage must be less than 36V. + The machine must be placed in a place with few people, away from flammable objects.