The bearing preload has significant influence on dynamic performance of motorized spindle. The dynamic performance and the life of bearing can be significant improve if the bearing preload can change according to the different conditions. The main purpose of this paper is to calculate the minimum bearing preload to prevent gyroscopic rotation and study the natural frequency and mode analysis of spindle vibration. Perform the experiments of variable bearing preload device based on piezoelectric actuators. Research the mechanical characteristic of piezoelectric actuators. Providing theory for improving the performance of the motorized spindle by controlling the bearing preload .

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