 Hello, I am Sachin Rathod working as assistant professor in mechanical engineering department from Walsh University of Technology, Singapore. Today we are dealing with the topic cam and follower from the course kinematics and theory of machines. Today we will discuss the basic things about the cam and follower in this part 1. So the learning outcome of this session is learner will able to understand classification of cam and follower. See we will right now observe the introduction part of cam and follower. The cam is rotating machine element which gives reciprocating or oscillating motion to another element known as follower. The simple figures I had given us so in which the rotating member is called as cam or it is a kind of the driver and the element which is having the reciprocating motion that is called as follower also it is known as driven member. So the driving member is called as cam and the driven member is referred to as follower. So you can think about this what are the applications of cam and follower. You can pause this video and you can think about this the applications of cam and follower. Generally in the automatic machines we are observing or in the paper cutting machines we are observing the cam and follower. Mostly it is observed in the IC engine because in the IC engine the inlet and outlet walls are operated by cam and follower. Otherwise we can observe the applications of cam and follower in machine tool mechanism. Also we can observe the applications of the cam and follower in printing control mechanism or in the paper cutting machine. So these are the some applications of the cam and follower. Now we will see the classifications of cam and follower. Firstly we will observe the classifications of follower according to the surface in contact means in which nature the follower surface is going to contact with the cam surface. In that first one is the knife edge follower. So as shown in the figure the follower is going to contact with the cam by the knife edge of the follower is called as knife edge follower. So if you observe the figures in that the reciprocating motion of the follower will occurs as the cam will get rotated. But this kind of the knife edge followers we are using rarely because as the knife edge is the contact between follower and the cam the excessive wear rate is a major problems of this knife edge follower. Second classification is flat face or mushroom follower. So as the contact between follower and the cam is perfectly flat in shape. So it is called as flat face or the mushroom in which we are observing the thrust is less and it can be minimized by offsetting the follower. Second one is a roller followers in which the contact between the roller and the cam is due to the rolling action. So it is called as roller follower. So this roller followers generally observed in the stationary engine where the space is more. And also it is observed that it requires the large amount of the forces will acts. So generally this type of the roller followers is used in the stationary engine. And if you observe the cam with flat face followers it is used in the automobile. And the fourth classification is spherical face follower. In the spherical face followers the contact between cam and followers is the spherical shape. So generally if there is a stress concentration problems in the flat face followers we can refer the spherical face follower. So these are the some classifications of the cam and followers according to the surface contact. Then second classification is according to the motion of the follower. First one is a reciprocating or translating followers. So the reciprocating follower is nothing but the followers will reciprocates is called as reciprocating or translating follower. And B is oscillating or rotating followers in which the follower will get oscillates. So it is called as oscillating or rotating follower. So if you observe this figure in which the follower will get oscillates. So with the help of pointer I will show that. So the follower will get oscillates like this about this pure point. So it is called as oscillating followers and the reciprocating follower. This follower will reciprocates up and down in this direction. So it is called as reciprocating or translating follower. Then the third classification of the followers is according to the path of motion of the follower. In that first one is a radial follower in which the followers will moves radially along the center of the cam. So the axis of the followers is along the axis of the cam. It is called as a radial follower. And the second type is offset followers in which the follower positions is offset by certain distance from the axis of the cam. So in this figure this is the axis of the follower and this is the axis of the cam. It is offset by this distance. So if there is a problem of side thrust at that time we can prefer this type of the follower that is offset follower. Now we will see the classification of cams. First one is a radial or disc cam. So in which the follower reciprocates or oscillates in the direction perpendicular to the axis of the cam. So previously what we have seen the types of the followers so in that all the cams are radial or disc cams. In which the follower reciprocates in the direction perpendicular to the axis of the cam. Second type is a cylindrical cam. In the cylindrical cam the follower reciprocates or oscillates in the direction parallel to the cam axis. The follower rides in the groove at its cylindrical interface. So in this figure you will observe that the axis of the cam and the follower will reciprocates parallel to the axis of the cam. So it is a kind of cylindrical cam. So on which on the cylinder the grooves are provided so due to these grooves on the cylinder the follower will get reciprocates in parallel to the axis of the cam. So it is called as cylindrical cam with reciprocating follower. And this cylindrical cam with oscillating followers in which as the cam will get rotates the follower will get oscillates, follower will get oscillate like this. So it is a kind of cylindrical cam. So in this bit we had observed the classification cam there are the two classification first one is radial or disc cam. This is a radial or disc cam in which this is a axis of the cam is perpendicular to the axis of the follower. So the cam axis is about this point and this follower axis both are perpendicular to each other. So it is called as a radial or disc cam and in the cylindrical cam the axis of the follower and the axis of the cams are parallel to each other. These are the classifications of the cam. So I have taken these references thank you.