In some precision machine tools, such as thread and gear processing machines, the axial runout of the spindle and lead screw has a great influence on the machining accuracy, which will produce a spiral error. The main factor that causes the axial runout is (take the sliding bearing as an example); the axial bearing surface of the main shaft and the axial bearing end face of the box hole are caused by the perpendicularity error of the center line of the main shaft, and the main shaft is bent and deformed. Causes the spindle to yaw. Secondly, there are machining errors in the journal and bearing conical surfaces.
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