IBC high precision angular contact ball bearing sets
The minimum support for a spindle uses a single high precision angular contact ball bearing on each side. The two are then arranged at a greater distance. Setting the required preload in this arrangement is done with a defined tightening torque by a suitable locknut or a ground-in flange cover. The correct lining up of the two separate high precision angular contact ball bearings is of great importance for the proper functionality of this form of angular contact ball bearings.
If that is not the case, the service life can be reduced due to greater friction losses and the associated higher operating temperatures.
If the load-bearing capacity of an individual bearing is not sufficient or if the bearing location must take up axial forces in both directions then high precision angular contact ball bearings with universally ground-preloading are used in sets.
IBC high-precision angular contact ball bearing sets have already been matched to one another during manufacture so that the previously determined preload value of the individual bearing in the set is retained and the load is taken up evenly via the individual bearings in the set.
The O- and X-arrangements of two high precision angular contact ball bearings makes it possible to take up axial loads in both directions. High axial loads in only one direction are supported by a tandem arrangement. High precision angular contact ball bearing sets with more than two high precision angular contact ball bearings can take up even greater loads in one direction. The angular contact ball bearing set is therefore in general set against another angular contact ball bearing or another set that takes up the axial loading in the opposite direction of loading. The contact lines running on the outside make the O-arrangement better suited to take up tilting moments.
Angular contact ball bearing sets in this arrangement provide relative rigid support in this sense. As opposed to the O-arrangement, in the X-arrangement the lines of contact to the separating line of the angular contact ball bearings run together. In this respect the X-arrangement is less stiff and somewhat more tolerant of tilting. In a tandem arrangement the lines of contact run parallel to one another and at the same angle to the separating line of the angular contact ball bearings.
IBC also offers further high precision angular contact ball bearing sets. Thus there can be, for example, a combination of a tandem arrangement in an O- or X-arrangement if the design does not permit the placing of the angular contact ball bearings in a tandem arrangement with respect to an additional angular contact ball bearing or an angular contact ball bearing set. If there are any special requirements concerning stiffness and the loading of the bearings, then tandem arrangements with three or four angular contact ball bearings are to be recommended.
Bearing sets with balanced preloading
Balanced angular contact ball bearing sets are also available, differing from arrangements of high precision angular contact ball bearings with the same preloading. In this case the high precision angular contact ball bearings with simple preloading are set against a high precision angular contact ball bearing with double or triple the preloading value.
This configuration is an especially good choice if a high precision angular contact ball bearing is set against more than one such bearing and is required to prevent the relieving of the preloading on the individual bearing.
In general, misalignment should be avoided. It leads to a certain amount of compulsory rotation, which increases the running noise and reduces the service life. An X-arrangement is somewhat less sensitive to this, compared to an O-arrangement.