Basic Considerations
In general, shafts are supported by only two bearings. When considering the bearing mounting arrangement, the following items must be analyzed:

• Expansion and contraction of the shaft caused by temperature variations
• Ease of bearing mounting and dismounting
• Misalignment of the inner and outer rings caused by deflection of the shaft or mounting error.
• Rigidity of the entire system including bearings and preloading method
• Capability to sustain the loads at their proper positions and to transmit them.