Machine Design
The centre distance between two meshing involute gears is equal to

Difference of base circle radii/cosφ
Sum of pitch circle radii/cosφ
Difference of pitch circle radii/cosφ
Sum of base circle radii/cosφ

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Machine Design
Cold working

Increases the fatigue strength
Decreases the fatigue strength
Has no influence on fatigue strength
Alone has no influence on fatigue strength

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