rotor bending force is generated by its own weight, usually rotor in a horizontal state bearing neck up-rising incliantion absolute value, to indicate the static bending of the rotor, this representation is merely a circumstantial evidence, the standard measurement method should be used dial gauge at each point axis. When the rotor is in the non-horizontal position, the absolute value of the bearing neck up-rising inclination, equal to half the difference between the ends of the rotor shaft of bearing neck up-rising inclination.