Radial Cam: Difference between revisions
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A 'follower’ may simply be a rod, constrained by guides, to slide up and down in a '''[[reciprocating motion]]''', as the cam, which it rests upon, rotates underneath it - i.e. as [https://en.wikipedia.org/wiki/Overhead_valve '''push-rods'''] of some car engines are driven up and down by the engine [https://en.wikipedia.org/wiki/Camshaft '''camshaft''']. The ends of the 'follower’ may be flat, round, wedge-shaped or pointed for different service conditions or may terminate with a roller for increased wear resistance. | A 'follower’ may simply be a rod, constrained by guides, to slide up and down in a '''[[Types of Motion|reciprocating motion]]''', as the cam, which it rests upon, rotates underneath it - i.e. as [https://en.wikipedia.org/wiki/Overhead_valve '''push-rods'''] of some car engines are driven up and down by the engine [https://en.wikipedia.org/wiki/Camshaft '''camshaft''']. The ends of the 'follower’ may be flat, round, wedge-shaped or pointed for different service conditions or may terminate with a roller for increased wear resistance. | ||
Followers may also be in the form of a [[Class of Lever|lever]] and when used against these, the cam generates an '''[[oscillatory movement]]'''. | Followers may also be in the form of a [[Class of Lever|lever]] and when used against these, the cam generates an '''[[Types of Motion|oscillatory movement]]'''. | ||
Revision as of 10:15, 12 February 2015
Radial Cams are one of the most common types of ‘cam’. The ‘radial cam’ is a rotating plate or disc with an outer circumference shaped to produce a required movement (usually linear) to a ‘follower’ which is held against it.
The radial cam may be a simple recognisable shape, such a circle or ellipse, or may be more a complex profile producing variations in the speed and magnitude of the follower movement, moments of 'dwell’ or a 'sudden drop’ - as with the 'snail cam’ shown. The sequence of follower movements is designed using a Displacement Diagram and the cam shaped accordingly.
A 'follower’ may simply be a rod, constrained by guides, to slide up and down in a reciprocating motion, as the cam, which it rests upon, rotates underneath it - i.e. as push-rods of some car engines are driven up and down by the engine camshaft. The ends of the 'follower’ may be flat, round, wedge-shaped or pointed for different service conditions or may terminate with a roller for increased wear resistance.
Followers may also be in the form of a lever and when used against these, the cam generates an oscillatory movement.