Broadly speaking, pneumatic tools are mainly a tool that uses compressed air to drive the air motor to output kinetic energy. According to its basic working methods, it can be divided into: 1.rotary type; 2.reciprocating type. General pneumatic tools mainly include Air Compressors and Air Tanks. The main part of the operation conversion part, the intake and exhaust path part, the operation start and stop control part, the tool housing, etc. Of course, the air tool operation must also have an energy supply part, an air filter and pressure adjustment part, and a tool attachment. It mainly transforms the rotational motion of the motor output. In the automotive industry, due to the large number of threaded connections, most of them are rotary motions, and of course linear reciprocating motions. For different types of pneumatic tools, the operating mode conversion part is mainly divided into mechanical clutches and planetary gear sets, friction plate clutches and planetary gear sets, hydraulic cylinders, torsion bars, and hammers.