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  RACEWAY CURVATURE  

Raceway curvature ratio (f) is the ratio of the raceway radius (R) to the ball diameter (Dw).


Inner raceway curvature ratio fi =  
Ri
Dw

Outer raceway curvature ratio fo =  
Ro
Dw
where:

Dw = ball diameter
R
i = inner raceway radius
Ro
= outer raceway radius


fi, fo values are typically 0.56 ± 0.03 for small bearings where low torque is a primary requirement. It is not necessarily the same for both inner and outer raceways. Raceway curvature ratio is often referred to as a percentage f x 100%.


The total curvature of a bearing is defined as B = fi + fo - 1







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