For the full access of the bearing capacity, the tolerances and details according to the shaft and housing recommendations must be strictly observed.
Whole-Surface Support of at Least One Flat Surface and the Bearing Bore
The bearing requires whole-surface support in at least one planar area and the bearing bore. Deviations from this have a negative effect on rigidity and running accuracy. The preload in the bearing is generated through the inner ring screw connection. Due to the high preload forces, the rings are deformed. These deformations can be reduced or avoided by the adjacent construction. The bearing has defined preload after being screwed on.
All AXRY bearings are designed and calculated based on this principle. Deviating adjacent constructions can lead to loss of rigidity and running accuracy or to a massive increase in friction. Bearing types with more flexible design, such as AXDR and AXCR, help to reduce this problem.
If the preload is applied through a screwed-in non-ferrous metal ring, ensure that the preload is uniformly applied to the bearing, e.g. via a steel ring that rotates together with the ring.
Edge Rounding / Radii
Oversized radii in the connecting parts prevent the bearing from being correctly tightened on the shaft or prevent the bearing from lying flat in the housing. The result is deformation of the bearing.
Perpendicularity / Cylindrical Shape and Roundness of the Shaft
Incorrect shape tolerances lead to undefined running conditions. Deformations and poor support of the bearing may occur.
Press Fit of Shaft
The press fit leads to expansion of the inner ring and thus to an increase in the radial preload. The higher the requirements on accuracy and speed, the more precisely the fit must be tailored. In highly dynamic or high-precision applications, this is ensured through individual pairing of the bearing and the connecting parts. The exact connection dimensions are therefore listed on the enclosed inspection report.
Clearance Fit of Shaft
The rotating ring should be supported via a transition fit to avoid displacement between the rotating table and the bearing. Otherwise, clearance fits can lead to an increase in radial runout. Only in this case is the radial running accuracy of the bearing on the table reproducible. This also applies to applications in which the outer ring rotates.
Avoid Double Centering
The bearing requires the largest possible whole-surface support in the area of the bearing bore. Further centering in the bore should be avoided. If this is unavoidable in terms of design, the additional centering areas must be as short as possible and have more clearance.
Fastening Thread in the Adjacent Construction
In order to avoid deformation of the screw-on surface when fastening the fixing screws, all fixing threads should be drilled out accordingly. We recommend 120 degree counterbores or cylindrical countersinks with a diameter 10% larger than the thread nominal diameter. The countersink depth should be at least 1 mm in total. All countersinks must be clean and absolutely burr-free.
