The positioning base and fixture method for the bearing sleeve are as follows:

(1) Internal Hole Machining

　　Positioning Benchmark: External diameter for internal hole machining

The bearing assembly clamping method: The three-jaw automatic centering chuck is used for clamping. During the turning operation, a dial indicator is employed for alignment, and a layer of copper sheet is wrapped around the clamping position.

(2) External Contour Machining

定位 Reference: The axis of the part is defined as the定位 reference.

The clamping method: The chuck is clamped using a three-jaw automatic centering chuck. During turning and clamping for processing, a dial indicator is used for alignment, and a layer of copper is wrapped around the clamping position.