The solutions to shaft and housing material expands more than bearing steel
Redesign or re-manufacturing:
In some cases, shaft and housing materials might be changed, e.g. stainless steel shaft to comply with food regulations or an aluminium housing to reduce equipment weight.
When the shaft material has a higher coefficient of thermal expansion than bearing steel, the radial internal clearance is further reduced. Therefore, for certain stainless steel shaft materials (300 series), either a slightly looser shaft fit is required or a bearing with increased radial internal clearance is required, e.g. CN to C3, C3 to C4, etc.
If a housing made from a material with a higher coefficient of thermal expansion than bearing steel, e.g. aluminium, is used, a slightly tighter fit may be required to prevent the outer ring from turning in the housing seat.
What action to do?
In both cases, it might be necessary to calculate the effect of the new shaft or housing material on internal bearing clearance and replace the bearing.
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