However, the most common type is in the valve actuators in internal combustion engines.Here, the cam profile is commonly symmetric and at rotational speeds generally met with, very high acceleration forces develop.
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The base circle is the smallest circle that can be drawn to the cam profile.
A once common, but now outdated, application of this type of cam was automatic machine tool programming cams.
Displacement diagrams are traditionally presented as graphs with non-negative values.
A simple displacement diagram illustrates the follower motion at a constant velocity rise followed by a similar return with a dwell in between as depicted in figure 2.
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This is continuous with a tangent to the tip circle.
In designing the cam, the lift and the dwell angle Several key terms are relevant in such a construction of plate cams: base circle, prime circle (with radius equal to the sum of the follower radius and the base circle radius), pitch curve which is the radial curve traced out by applying the radial displacements away from the prime circle across all angles, and the lobe separation angle (LSA - the angle between two adjacent intake and exhaust cam lobes).
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