1. When using the cutting machine, the grinding should be kept sharp, intact, installed correctly, firm and reliable. 2. The grinding wheel speed is greater than 10000r/min, which has strict requirements on the quality and installation of the grinding wheel. Before use, the wheels and ground pads should be checked and crossed and installed firmly, the nut should not be too tight, it is not allowed to be used in places where it is wet, deformed, cracked, broken, knocked on the notch or in contact with hub oil and alkali, and it is not allowed to use self-drying and wet. type grinding wheel. 3. When the hand-held power tool works at high speed and high vibration, it is in direct contact with the human body. Therefore, in wet places or in good places such as metal structures, pressure vessels, and pipes that conduct electricity during operation, it must be used with dual or dual power of power tools. Reinforced insulation.