An eccentric shaft becomes an eccentric when a circle does not rotate around its center. The eccentric shaft is also a kind of cam. Generally speaking, the main purpose of the eccentric wheel is to generate vibration. Like the electric screen, the vibrator in the mobile phone uses the eccentric wheel. Most of the eccentric wheels are round wheels, because the round wheels are easy to manufacture and the process is simple.

The machining of eccentric parts is a difficult point in machining. Three jaw chuck and four jaw chuck are generally used for machining of eccentric bearings, cams and other eccentric parts, which are processed on ordinary machine tools. With the continuous development of science and technology, the demand for eccentric center parts is increasing, and the precision is also getting higher and higher. Therefore, the demand for this kind of eccentric fixture is also increasing correspondingly, and its application prospect is broad. The eccentric shaft is one of the common typical parts. According to the different structural forms of shaft parts, it can be generally divided into optical shaft eccentricity, stepped shaft eccentricity and special-shaped eccentric shaft; Or divided into solid eccentric shaft, hollow eccentric shaft, etc. They are also used to support gear, pulley and other transmission parts in the machine to transmit torque or motion.