Rolling bearings are mainly used in three parts: main shaft, ball screw and general drive shaft. So how should CNC machine tools, machining centers and precision machine tools choose bearings? Xiaobian today analyzes for you how to choose precision machine tool bearings, machining center spindle bearings, and CNC machine tool spindle bearings! For the spindle support of high-speed and high-precision machine tools such as CNC machine tools and machining centers, super-precision bearings of P4 and above should be selected, and the spindle of precision machine tools should be selected with precision of P5 or above. P4 and above super-precision bearings are used in the spindle support of high-speed and high-precision machine tools such as machining centers. As the basic support component of CNC machine tools, spindle bearings directly affect the speed, rotation accuracy, stiffness, anti-vibration cutting performance, noise, temperature rise and thermal deformation of CNC machine tools, and affect the accuracy and surface quality of machined parts. Therefore, high-performance machine tools must be equipped with high-performance bearings. The rotation accuracy of the spindle system refers to the accuracy of radial runout, section runout and axial runout. The accuracy of the spindle system is mainly affected by the following factors. 1. The radial runout of the groove of the bearing ring corresponds to the main shaft of the main shaft system, thus reflecting these errors on the machined surface. 2. The diameter of the bearing rolling element is inconsistent, and the shape error will lead to regular errors in the spindle. 3. The side swing of the groove to the end face will cause the axial movement of the main shaft. The influence of axial motion on precision grinders, especially bearing grinders, is particularly pronounced. If the groove grinding method is adopted, the reject rate and noise will be greatly improved. The size and position error of the bearing installation working surface will cause the bearing roller to deform accordingly, make the inner and outer rings of the bearing tilt, make the bearing inconsistency in all directions, and reduce the rotation accuracy of the spindle system. The end face of the nut, spacer sleeve and washer for adjusting the clearance needs to be ground, and the verticality of the shaft rotation axis should correspond to the accuracy of the installed bearing, otherwise the working accuracy of the bearing will be reduced. He has 37 years of experience in the research and development, production and testing of bearings, focusing on the research and development and production of machining center spindle bearings, CNC machine tool spindle bearings, and precision machine tool bearings. The outer diameter of the size range is up to 450mm, the inner hole size is more than 10mm, and the precision is P0, P6, P5, P4, and P2, which are higher than the national standard.