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Define (i) Pressure angle (ii) Pitch point related to cam.

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Question: 

Define (i) Pressure angle (ii) Pitch point related to cam.

Answer: 

(i) Pressure angle: It is the angle between the direction of the follower motion and a normal to  the pitch curve. This angle is very important in designing a cam profile. If the pressure angel is too large, a reciprocating follower will jam in its bearing.
(ii) Pitch point: It is point on pitch curve having the maximum pressure angle.