Rolling bearing.
Why put rolling balls between a shaft and its housing?
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Why put rolling balls between a shaft and its housing?
Fit the components, then test the mechanism.
The balls roll between the two races, replacing a sliding contact with rolling resistance. The selected coefficients are illustrative so the comparison teaches the cause without pretending to predict a catalog bearing.
Effective illustrative coefficients, positive radial load; no lubricant, speed or manufacturer prediction.
Reduce illustrative friction torque by at least 90%.
Compare rolling and sliding friction torque.