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

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

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Machine Design
Crowning on pulley helps

To increase pulley life
To keep the belt in centre on a pulley while it is in motion
In decreasing the slip of the belt
In increasing the slip of the belt

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