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Typical Running Traces of Deep Groove Ball Bearings

(A) shows the most common running trace generated when the inner ring rotates under a radial load only.

(E) through (H) show different running traces that result in a shortened life due to their adverse effect on bearings.


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Inner ring rotation
Radial load


Outer ring rotation
Radial load


Inner ring or outer ring rotation
Axial load in one direction


Inner ring rotation
Radial and axial loads


Inner ring rotation
Axial load and misalignment


Inner ring rotation
Moment load (Misalignment)


Inner ring rotation
Housing bore is oval


Inner ring rotation
No radial internal clearance
(Negative operating clearance)


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