Check raceway, raceway, surface condition, cage wear, clearance of outer spherical bearing seat and improvement of dimensional accuracy, irrelevant damage, abnormal.Non-detachable small ball outer spherical bearing seat, inner ring, with one hand level support, rotate outer ring to confirm smooth.

In order to determine whether the disassembled outer spherical bearing seat can be used, check the outer spherical bearing seat after cleaning.Check the state of raceway surface, rolling surface and mating surface, the wear of the cage, the increase of clearance of the outer spherical bearing seat and the damage and abnormality of irrelevant dimensional accuracy.Non-separable small ball outside the spherical bearing seat, with one hand will support the inner ring horizontal, rotating the outer ring to confirm whether smooth.

1. Speed and temperature rise

With the development of science and technology, the machine tool spindle speed is getting higher and higher, the range of speed change is getting larger and larger, therefore, the external spherical bearing seat high-speed operation stability requirements are getting higher and higher.The temperature rise of the outer spherical bearing housing of machine tool spindle is an important factor to limit the rotating speed of the outer spherical bearing housing.Generally, the correct choice of the type, tolerance grade, configuration mode, clearance (preload) size, lubricant and lubrication mode of the outer spherical bearing seat can improve the high-speed performance of the rolling outer spherical bearing seat to a certain extent. 

2. Service life and carrying capacity

For general machine tools, the life of the spindle component mainly refers to the life of its spindle precision maintenance, therefore, the requirements of the accuracy maintenance performance of the external spherical bearing seat to meet the requirements of the life of the spindle component.For heavy duty machine tools or strong cutting machine tools, the bearing capacity of the outer spherical bearing seat should be considered first. 

3. Stiffness and vibration resistance

In order to ensure the machining quality of machine tools, the spindle system must be rigid enough, otherwise it will produce a large mirror error or even flutter.Vibration resistance refers to the ability to resist forced vibration and self-induced vibration.The vibration resistance of the spindle assembly depends on the stiffness and damping of the spindle and the outer spherical bearing housing.The rigidity of the spindle system can be improved effectively by using preload rolling outer spherical bearing seat. 

4. The noise

In high speed grinding machine, the noise of the spherical bearing seat outside the grinding head is the main component of the noise of the whole machine, so the low noise rolling spherical bearing seat should be selected.