The base circle is the smallest circle that can be drawn to the cam profile.
Page Comments Introduction Cams come in all shapes and sizes and are found in most branches of engineering.
Indeed without them many of our everyday appliances would not work.
Simple cams form the basis of rotary cam timers which are used to control some household appliances, car engine would not work without the cams and many industrial machine tools rely upon them. In truth cams are ubiquitous. Types Of Cams A Cam is a reciprocating, oscillating or rotating body which imparts reciprocating or oscillating motion to a second body, called the follower, with which it is in contact.
The shape of the cam depends upon its own motion, the required motion of the follower and the shape of the contact face of the follower. Oscillating motion is linear motion that alternates backward and forward. Linear motion is a motion along a straight line path, such as a bicycle.
Of the many types of cam, a few of the most common are shown in the diagram. In general the motion of the follower is only determined positively by the cam during a part of each stroke whilst during the remainder of the stroke contact between the cam and the follower has to be maintained by an external force, often supplied by a spring.
In this connection it should be noticed that the cam does not, as would at first appear likely, determine the motion of the follower during the whole of the its out-stroke.
Actually, owing to the inertia of the follower, it is only during the first part of the out-stroke and the latter part of the return that the motion of the follower is positively controlled by the cam. Cams are classified according to the direction of displacement of the follower with respect to the axis or oscillation of the cam.
The two most important types are: Disc or Radial Cams In these the working surface of the cam is shaped that the reciprocation or oscillation of the follower is in a plane at right angles to the axis of the cam.
Followers can be divided according to the shape of that part which is in contact with the cam.
The following diagram shows some of the more common types: These are not often used due to the rapid rate of wear of the knife edge. This design produces a considerable side thrust between the follower and the guide. The roller follower has the advantage that the sliding motion between cam and follower is largely replaced by a rolling motion.
Note that sliding is not entirely eliminated since the inertia of the roller prevents it from responding instantaneously to the change of angular velocity required by the varying peripheral speed of the cam. This type of follower also produces a considerable side thrust.
Flat or Mushroom Follower. These have the advantage that the only side thrust is that due to friction between the contact surfaces of cam and follower.Different Types of Cams (Mechanical Engineering) Radial cam with a knife edge follower In the radial cams, the working surface of the cam is designed such that follower moves in a plane perpendicular to the axis of the cam performing a reciprocating motion.
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Circular cams cause smooth linear motion, heart cams maintain a uniform velocity in the cam follower, and drop cams produce a rapid and discontinuous linear motion. Read more here. Gears: Gears are one of the most common and diverse types of mechanical devices. Cam and Follower Mechanism is a widely used method of motion transformation.
Cam follower is also known as 'Track Follower'. Cam is a rotating element Which provides an oscillation or reciprocatory motion to another part connected with the cam.
Cams can be classified into the following three types based on their shapes. They are: Plate or disk cams: Plate or disk cams are the simplest and most common type of cam. A plate cam is illustrated in figure 3 (a). This type of cam is formed on a disk or plate.