The acceleration of the development of factory automation and the development of large-scale hydropower and nuclear power have made the application of vertical cars more and more widely, and the specifications of vertical cars are increasing, the carrying capacity is increasing, and the accuracy of vertical cars, especially the rotation accuracy of the worktable, is improving , The large-size vertical lathe worktable has a diameter of more than 25 m. The worktable must not only bear the weight of the workpiece, but also ensure the rotation accuracy under this load, as well as high anti-overturning ability and high speed. The key issue restricting the development of vertical lathes is the manufacturing and configuration of spindle bearings of the worktable. For the convenience of research, this article will study the vertical lathe table diameter range between 1000 mm to 5000 mm, the vertical lathe in this range is also a vertical lathe in the traditional sense.