Theory of Machine
The cam follower generally used in aircraft engines is

Flat faced follower
Spherical faced follower
Knife edge follower
Roller follower

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Theory of Machine
The contact ratio is given by

(Length of path of recess)/(Circular pitch)
(Length of the arc of contact)/(Circular pitch)
(Length of the path of approach)/(Circular pitch)
(Length of the arc of approach)/cosφ

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