Cam Profile

Topics: Cartesian coordinate system, Tangent, Analytic geometry Pages: 4 (1033 words) Published: November 24, 2009
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Name- Gurpreet Singh
Class- Mech. Diploma {B-Tech 6yrs}
Section- Rj0708
Roll No. - Rj0708x30
Reg.No. - 4180070122
{text:bookmark-start} A Simple Experiment: What is a Cam? {text:bookmark-end} {draw:frame}
Simple Cam experiment
Take a pencil and a book to do an experiment as shown above. Make the book an inclined plane and use the pencil as a slider (use your hand as a guide). When you move the book smoothly upward, what happens to the pencil? It will be pushed up along the guide. By this method, you have transformed one motion into another motion by a very simple device. This is the basic idea of a cam. By rotating the cams in the figure below, the bars will have either translational or oscillatory motion. Task

Basic Principle
Graphical Layout of Cam Profiles
The task is too determining the exact shape of the cam. Surface required to dwliver a specified follower motion, we assume here that the reqired motion has been completely determine,,,, graphically as well as analytically. We will only address the case of plate cams.

Basic principle
In constructing the cam profile, we employ the principle of kinematic inversion, imagining the cam to be stationary and allowing the follower to rotate apposite to the direction of cam rotation. Talking the cam with knife-edge follower for example, the locus generated by the trace point as the follower moves relative to the cam is identical to cam surface. By this way cam surface can be figured out. GRAPHICAL LAYOUT OF CAM PROFILE

For the case of reciprocating knife-edge follower {draw:frame} As shown in figure the displacement diagram of follower is given s=s. construct the plate cam profile. For the case of reciprocating knife-edge follower {draw:frame} Step 1; divide the displacement-diagram abscissa...
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