Abstract
This paper is concerned with the milling instability of spindle-ball bearing milling system. The finite-element analyzes is adopted. It is verified that there existed close relationships between the vibration response and the milling instability contributed by the same spindle mode. The spindle mode, which excites the maximum peak spectrum value, will produce the milling instability most likely. The front bearing preload has much more remarkable influences on spindle modes and milling stability than the rear one. It is therefore very important to adjust the front bearing preload according to the actual processing situations and stability demands in the spindle system design stage.
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