Common machinery contains a large number of rotating parts, such as various transmission shafts, main shafts, electric motors, and steam turbine rotors, which are collectively referred to as rotating bodies.Under ideal circumstances, the pressure on the bearing is the same when the revolving body rotates and when it is not rotating. Such a revolving body is a balanced revolving body.

　　However, due to uneven materials or blank defects, errors in processing and assembly, and even asymmetrical geometric shapes in the design of various rotating bodies in engineering, when the rotating body rotates, there are many factors on it. The centrifugal inertial force generated by the tiny particles cannot cancel each other out. The centrifugal inertial force acts on the machine and its foundation through the bearing, causing vibration, generating noise, accelerating bearing wear, shortening the mechanical life, and causing destructive accidents in severe cases.

　　For this reason, the rotor must be balanced to make it reach the allowable balance accuracy level, or the resulting mechanical vibration amplitude is reduced within the allowable range.

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