The following describes the correct use methods and safety precautions of several commonly used hand tools and electric tools:
1. Metalworking hand hacksaw: suitable saw blade shall be selected for working objects, such as 14 teeth per inch for cutting solid or thick soft metal; 18 teeth for tool steel, iron pipe and hard metal; And 24 teeth per inch are suitable for sawing metal plates, metal tubes and thin iron bars. Push the saw forward and lift it gently when pulling it back.
2. Wrench: ① The wrench with appropriate size shall be selected according to the nature of work. ② When using the adjustable wrench, the force should be applied to the fixed side, and never to the movable side. ③ If the wrench opening is worn or skidded during use, it can not be used again to prevent hands from being hurt by skidding. ④ Do not use a wrench as an iron border. ⑤ Do not put a pipe on the handle end of the wrench to increase the torque of the wrench.
3. Driver: ① The proper driver shall be selected according to the size and shape of the screw head groove. ② The handle of the screwdriver can not be hit with a hammer, and the damaged handle should be replaced immediately. ③ Do not use the screwdriver as a chisel or lever. ④ The electrical driver shall be used to test the current, and the general driver shall not be used to test the high voltage. ⑤ The edge of the screwdriver shall not be grinded to avoid damaging the hardened surface. ⑥ Do not put the screwdriver in the pocket of clothes or trousers to avoid injury in case of collision or fall.
4. Pliers: ① Pliers are only used to fasten, insert and remove various pins and nails, and cut or tighten various wires. ② Pliers cannot be used to tighten or knock bolts or nuts. ③ Do not knock or lengthen the handle of the pliers to increase the clamping or cutting force.
5. Portable electric drill: ① The wrench conforming to the specifications must be selected for the tightness of the drill bit. ② Before starting the electric drill switch, the electric drill must be firmly held. ③ When the electric drill is not in use or when the drill bit is replaced, turn off the power supply before putting it down. ④ The drill bit should be removed first when finishing work. ⑤ The pressure on the bit should be moderate. Too much force may break the bit or reduce the speed of the bit. Too little force may easily wear the bit. During fast drilling, the pressure must be light to facilitate smooth drilling. ⑥ When drilling small workpieces, the workpieces should be fixed with clamps and never be held by hand. ⑦ When using the electric drill, do not wear loose clothes, ties, scarves, gloves, and long hair should be tied up.
6. Portable grinding wheel: ① Before use, check whether the grinding wheel is broken, rotated improperly, the grinding plate is unbalanced, and the shield is loose. ② Wear goggles or face shield when grinding. ③ You or others should avoid the direction of grinding wheel rotation to prevent flying debris or splashing of grinding wheel fragments. ④ The grinding wheel cannot be grinded again after cutting off the power supply, let alone accelerate the grinding wheel to stop in this way.
7. Electric soldering iron: ① The electric soldering iron should be kept clean and free of sundries. ② Do not knock to avoid electric leakage due to rupture of insulating magnetic tube. ③ The transistor assembly should use 30-40 watt electric soldering iron. ④ The electric soldering iron should be placed on the bracket or insulating material when not in use. ⑤ The temperature of the electric soldering iron is very high, and attention should be paid to avoid scalding, or fire caused by being close to inflammables.