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The principle of a screwdriver
The working principle of a screwdriver is the wheel axle principle, which means that force acts on the wheel. When the ratio of the wheel radius to the shaft radius is larger, it saves more effort, so a thicker screwdriver is more labor-saving to use.
The main types of screwdrivers
1. Ordinary screwdriver: A common screwdriver suitable for use in multiple places, with different specifications and sizes such as length and thickness.
2. Precision screwdriver: Clock and watch drivers, small diamond screwdrivers, mobile phone screwdrivers, etc., mainly used for repairing precision instruments, with smaller size specifications.
3. Combination screwdriver: The screwdriver head and screwdriver handle can be separated, and when installing different types of screws, only the screwdriver head needs to be replaced.
4. Electric screwdriver: Use an electric motor instead of manual rotation to install and remove screws, usually a combination of electric screwdriver sets.
5. Pneumatic screwdriver: uses compressed air as the power to operate, with fast speed, high safety, and anti-static performance.
Instructions for using a screwdriver
1. How to unscrew a screw with a screwdriver
Find a screwdriver that matches the model of the screw, then clip the screwdriver head into the screw hole, and then turn the screwdriver to unscrew the screw.
2. How to change the head of the screwdriver
Press the shaft cap of the screwdriver with your thumb, take out the screwdriver head, then continue to press the shaft cap until the shaft center leaks out. Then align the prepared screwdriver head with the clamp, and finally release the shaft cap.
3. How to Magnetize a Screwdriver
You can put the screwdriver and magnet together to increase the magnetism of the screwdriver, or you can rub the screwdriver head against the magnet a few times before using the screwdriver, which can also produce a magnetization effect.
How to choose a screwdriver
1. Look at the requirements
Before choosing a screwdriver, you should first clarify your needs, as there are many types of screwdriver models and different types of screwdrivers will be used for different needs. For household use, you can choose a regular screwdriver set. For professional use, you need to choose the appropriate screwdriver product and screwdriver head according to your business needs.
2. Look at the material
① Chromium molybdenum steel (Cr Mo)
This type of steel is an alloy of chromium, molybdenum, iron, and carbon, with excellent impact resistance, hardness, and toughness. It is generally used to make top-level screwdrivers and small hexagonal wrenches, but the disadvantage is that it is relatively expensive.
② Chromium vanadium steel (Cr-V)
This material is an alloy of chromium and vanadium elements, with good strength and toughness, making it the ideal material of choice for making wrenches, screwdrivers, etc. It is relatively cheap in price and is a universal material for screwdrivers in daily life, making it the perfect choice for household screwdrivers.
③ Carbon Steel (CS)
Carbon steel refers to a type of steel that does not contain other specific elements and has a carbon mass fraction less than 2.11%. Its advantages are high hardness and strength, while its disadvantages are poor toughness. This material is not suitable for use as a screwdriver and is mainly used for some general tool materials.
④ S2 tool steel
S2 tool steel is an excellent impact resistant steel used for making high hardness hexagonal wrenches, screwdrivers, etc. The tools made of this type of steel have sufficient hardness, good wear resistance, certain strength and toughness after heat treatment, but they are not as good as chromium vanadium steel in the actual material selection and application of screwdrivers.
In summary, it is generally better to use chrome vanadium steel as a screwdriver for household use, while chrome molybdenum steel is suitable for special purposes or demanding operations.
3. Look at the quality
The appearance of the screwdriver should be uniform in color, with no obvious dents, scratches, or bumps on the surface of the plastic parts. The aluminum casting coating should be smooth and beautiful without defects, and the surface of the entire machine should be free of oil stains and stains.
4. Brand and after-sales service
When purchasing branded screwdrivers, attention should be paid to avoiding buying high imitation products. Before making a purchase, you can check the brand's reputation online to see how the product quality and after-sales service are. A good brand has good product quality and after-sales service, which can ensure consumer rights.