1. During the operation, the operator should always check the safety of the round bar machine. Once the impeller, hemp wheel or cloth wheel is found to be loose with the motor connecting rod, stop working immediately. When clamping the polishing wheel, the screw must be Tighten firmly. After the adjustment is normal, it can work. If the guide wheel is damaged, it should be replaced immediately and tightened. Do not disassemble the grinder without permission, pay attention to daily maintenance and use management. The power cord of the round bar machine shall not be reconnected without permission, and the length of the power cord of the round bar machine shall not exceed 3 meters; the protective cover of the round bar machine is damaged or damaged and is not allowed to be used. It is forbidden to remove the protective cover to polish the workpiece;