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)

- Aω (r₁ r₂) sinθ
- Bω (r₁ + r₂) sinθ sec2θ
- Cω (r₁ r₂) cosθ
- Dω (r₁ + r₂) cosθ cosec2θ

ω (r₁ + r₂) sinθ sec2θ

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For an involute gear, the ratio of base circle radius and pitch circle radius is equal to

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