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CNC machine tool feed system to get higher transmission stiffness, in addition to strengthening the rigidity of the ball screw nut itself, the ball properly installed and its supporting structure stiffness factor can not be ignored. Nut and bearing seat should have sufficient rigidity and precision. And the machine are usually appropriate to increase the contact area of the coupling member, in order to improve the local stiffness and nut seat contact strength, Bearings new design allows the process conditions, the machine often the nut seat or bearing seat is formed integrally with the machine body to increase the rigidity.
In order to improve the axial stiffness of the support, select the appropriate bearing is also very important. China is currently mainly in two combinations. One is the radial bearings and tapered bearings used in combination, although its structure is simple, but the axial stiffness is insufficient. Another is the thrust bearing or radial thrust and radial bearings used in combination, the axial stiffness has increased, but increases the bearing friction and heat and increased bearing support structure size. In recent years, domestic bearing manufacturers have to produce a ball bearing, which is a large axial force to withstand the special angular contact ball bearings, with the general thrust ball bearings to the heart, the contact angle increases to 60o, to increase the number of balls and accordingly reduce the diameter of the ball. This new structure bearing FAG bearings than the average axial stiffness increased more than twice, and extremely easy to use, the products are sold in pairs, but also a good option at the factory has a thickness of inner and outer rings, the assembly and the end as long as the nut cover the inner and outer compression, you can get a good factory has been adjusted preload.
Ball screw installation usually have the following:
1) double push a free way, screw fixed at one end, end free. Fixed end bearings withstand axial and radial forces. This method is used to support small stroke short screw.
2) double push a supporting means, screw one end fixed and the other end support. Fixed end bearings withstand axial and radial forces; supporting end bearing only the radial force, but also for the small amount of axial float, to avoid or reduce the emergence of screw bending due to weight. Thermal deformation while the screw to the end of the extension is free.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| NU216E NTN | 80 | 140 | 26 |
| NU216 NTN | 80 | 140 | 26 |