Other influences on clearance/preload
Axial clamping of a ring results in a small increase of its diameter. Normally, this has a negligible influence. For machines where there is a large axial load on any of the rings, or where two bearings (e.g. angular contact ball bearings or tapered roller bearings, with or without distance rings) are clamped axially, the influence on clearance or preload from the axial compression and the radial expansion must be considered.
Misalignment beyond the limits specified in the product sections will reduce the clearance which, due to unfavourable load distribution, will result in reduced service life and increased friction.
Where light alloy materials are used, the temperature differences between rings and shaft or housing may have a more pronounced influence on the clearance of the bearing.