The Spring-load follower A bears against circular portion of the cam until the lobe of the cam lifts the plunger. The force required to lift the plunger is proportional to its vertical movement h from its lowest position. For design purposes determine the angle Theta for which the moment of the contact force on the cam about the bearing O is a maximum. In the enlarged view of the3 contact, neglect the curve between B and C.

40 mm s0 mm