2. Screwdriver
Screwdriver, also known as screwdriver, can be divided into straight screwdriver and cross screwdriver according to function, and can be divided into wooden handle screwdriver, through-hole screwdriver, insulated screwdriver and eccentric screwdriver according to material and shape.
A screwdriver is a tool used to tighten or loosen slotted screws. Specification of screwdriver (rod length): 50mm ... 350 mm, etc. When using a screwdriver, it is required that the cutting edge end of the screwdriver should be flush and consistent with the width of the screw groove, and there should be no oil stain on the screwdriver. Let the opening completely match the screw groove, and after the center line of the screwdriver is concentric with the center line of the screw, turn the screwdriver to tighten or loosen the screw. Tip: Many screwdriver bits are magnetic now.
3. Pliers
Needle-nosed pliers alias: prosthodontics pliers, pointed pliers, pointed pliers. It consists of a tip, a knife edge and a pliers handle. ?
Usage of needle-nosed pliers: The handle of pliers is covered with an insulating sleeve with rated voltage of 500V V, which is a common locksmith tool. Use? It is mainly used for shearing single strand and multi-strand with smaller thread diameter and single strand feeding. Bending of wire connector, stripping of plastic insulation, etc. It can be operated in a narrow working space. Those without cutting edges can only be pinched, and those with cutting edges can cut small parts. When using, be careful not to face the cutting edge to avoid injury.
Bass pliers, used to clamp flat or cylindrical parts, have cutting edges to cut metal. When in use, clean the grease on the pliers to avoid slipping at work. After the parts are firmly clamped, they are bent or twisted; When clamping large parts, enlarge the jaws. Do not turn bolts or nuts with pliers.
Snap ring pliers are a special tool mainly used to disassemble and assemble internal and external elastic snap rings, which are commonly used in the maintenance of internal parts of automobiles.
Precautions for use:
1, the force should be steady to prevent falling off or breaking.
2. Wear gloves to prevent the snap ring from breaking and hurting people.
3. Wear goggles, too.
4. Wrench
open-ended spanner
Open-ended wrench is a kind of open-ended wrench with basically fixed size, also known as fork wrench. Because the opening of this wrench is fixed, bolts and nuts with different sizes and specifications need to correspond to the wrench one by one. The specifications of the opening are usually marked on the wrench, and the distance between the opposite sides of the hexagonal or quadrangular nut is the model suitable for the opening of the wrench. Although the open-ended wrench has a fixed opening and strong pertinence, it has a stable structure and is durable, which is much more convenient than adjustable wrench in practical use.
1. Open-ended wrench can only pull bolts or nuts in a limited space. After the bolt or nut is pulled to the limit position, take out the wrench and repeat the original process. ?
2. Pull the wrench towards the connected jaw. ?
3. When the open-ended wrench is used for final tightening, the force applied to the wrench should not be too large, otherwise the thread or nut will slide outward. ?
4. The wrench should be completely clamped on the bolt to increase the contact area. ?
5. Only wrenches with the same size as bolts or nuts can be selected. ?
6. If the wrench is too large, it will damage the bolt or nut. ?
7. Improper use of wrench will damage wrench or bolt and nut.
The ring wrench is suitable for folding bolts or nuts in the range of 5 ~ 27mm. Each set of ring wrenches has 6 pieces and 8 pieces. The two ends of the ring wrench, such as sleeves, have an angle of 12 and two hexagons, which can cover the head of the bolt or nut and is not easy to slide down when working. Some bolts and nuts are restricted by surrounding conditions, especially ring wrenches.
Precautions for use:
1, don't use a broken or cracked ring wrench, or you will hurt yourself. ?
2. Hexagon ring wrench is more slip-proof than 12- face ring wrench. ?
3. The selection of ring wrench should be suitable for the size of bolt or nut. ?
4. Bolt or nut sleeve should be fixed before applying force, otherwise it will damage the bolt or nut. ?
5, can't use the pipe on the wrench to increase the length of the wrench tightening, it will damage the wrench or bolts and nuts.
The socket wrench is suitable for folding some bolts and nuts that can't work because of the limited position of ordinary wrenches. When folding bolts or nuts, you can choose different sleeves and handles as needed. There are also sets of such tools, such as 32 sets of Nanjian and 27 sets of Shida.
Special wrench: or ratchet wrench, quick wrench, etc. , should be used in conjunction with the socket wrench. Generally used to tighten or remove bolts or nuts in narrow places. It can disassemble or assemble bolts or nuts without changing the angle of the wrench.
5. Torque wrench
Pointer torque wrench: used to tighten bolts or nuts with the sleeve. Torque wrench is essential in automobile repair, such as the fastening of cylinder head bolts and crankshaft bearing bolts. The torque of the torque wrench for automobile maintenance is 288 1 Newton meters. ?
The preset torque wrench has a preset torque value and a sound device. When using, first set a required upper limit of torque value. When the applied torque reaches the set value, the wrench will make a "click" sound or the joint of the wrench will bend a little, accompanied by obvious hand shock, indicating that it has been tightened, and no more force is needed, prompting to complete the work. After the force is released, all relevant parts of the wrench can be automatically reset.