The principle of screwdriver
The working principle of the screwdriver is the wheel-axle principle, that is, the force acts on the wheel. When the ratio of the wheel radius and the shaft radius is larger, the effort is saved, so the thicker the screwdriver, the less effort it takes to use it.
The difference between a screwdriver and a screwdriver
A screwdriver is a screwdriver with a removable and replaceable blade, while a screwdriver is generally a whole piece with a non-detachable blade. There are also some screwdriver sets that come in the form of a screwdriver, which is a set consisting of two screwdriver handles and various types of screwdriver bits.
The difference between a screwdriver and a screwdriver
A screwdriver and a screwdriver are the same thing, and a screwdriver is the scientific name of a screwdriver. There is no difference between the two. The main thing is that the dialects of different regions have different names for screwdrivers.
What are the main types of screwdrivers:
Ordinary screwdriver: The most common screwdriver, suitable for use in multiple places, with different specifications such as length and thickness.
Precision screwdrivers: watch screwdrivers, small diamond screwdrivers, mobile phone screwdrivers, etc., are mainly used to repair precision instruments and have smaller sizes.
Combination screwdriver: The screwdriver head and screwdriver handle can be separated. When installing different types of screws, you only need to replace the bit head.
Electric screwdriver: Uses an electric motor to replace the rotation of the human hand to install and remove screws, usually a combination electric screwdriver set.
Pneumatic screwdriver: uses compressed air as power to operate. It is fast, safe and anti-static during use.
How to choose a screwdriver
Look at demand
Before purchasing a screwdriver, you must first clarify your needs, because there are many types of screwdrivers, and different screwdrivers will be used for different needs. If it is for household use, just buy an ordinary screwdriver set. If it is for professional use, You need to choose the appropriate screwdriver product and screwdriver bit according to the job requirements.
Look at the material
1. Chromium-molybdenum steel (Cr-Mo)
Chromium-molybdenum steel has very good impact resistance, hardness and toughness, but it is relatively expensive.
2. Chromium vanadium steel (Cr-V)
Chromium vanadium steel has very good strength and toughness and is relatively cheap, making it the best choice for household screwdrivers.
3. Carbon steel (CS)
Carbon steel has high hardness and strength, but poor toughness.
4. S2 tool steel
S2 tool steel has high hardness, good wear resistance, certain strength and toughness, and is worse than carbon steel, but its performance is not as good as chromium vanadium steel.
Look at quality
The appearance of the screwdriver should be uniform in color, there should be no obvious dents, scratches or bump marks on the surface of the plastic parts, the paint on the aluminum castings should be smooth and beautiful without defects, and the surface of the entire machine should be free of oil and stains.
