Theory of Machine
The velocity of the reciprocating roller follower when it has contact with the straight flanks of the tangent cam, is given by (where ω = Angular velocity of the cam shaft)

ω (r₁ r₂) cosθ
ω (r₁ + r₂) cosθ cosec2θ
ω (r₁ r₂) sinθ
ω (r₁ + r₂) sinθ sec2θ

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