Axial stiffness and precise guidance are important parameters of the machine tool

For machining centers, milling machines, lathes and drills, axial stiffness and precise guidance are critical parameters, especially when axial forces alternate. For these applications, the preload of the bearing is adjusted, usually relative to each of the other bearing rings in the axial direction.

This approach offers significant advantages in pre-assembly in terms of system stiffness. However, in the case of ball bearing types and materials, the rotational speed is greatly pre-loaded.

With the spring, the bearing's motion behavior does not affect the preload under normal operating conditions. However, please note that a spring bearing arrangement has a pre-arranged degree of stiffness that is lower than a set using axial displacement. The method of preloading the spring is actually the use of ingot standards for the internal grinding machine.

The most common spring-loaded guide value relationships are listed in the schedule table. This value applies to single bearings in CD design. For bearings arranged in series, the values ​​in the table should be multiplied by a factor equal to the spring force and the number of pre-assembled bearings.