 Hello everyone, I am Sachin Rathod, working as an assistant professor in mechanical engineering department from Walton Institute of Technology, Solapur. Today, we will deal with the topic camman followers, so in which we will see the part two. So, already in the last sessions, we have seen the part one. In the part one, we have seen the basic things about the camman follower, means the classification of the camman follower we have seen in the last part. So, now we will see the second part. The learning outcome of this session is the learner will able to understand the terminology used in the cam. So, in this figure, this is a basic terms used in the cam for producing the cam profile. So, you can think about this the which type of camman followers given in the figure. So, this cam profiles I highlighted that and the follower motions also I have highlighted. So, as we have learned in the last lectures, you can identify the which type of camman follower present in the given figure. You can pause this video and you can think about this. So, now we will see the term used in the radial cams. First one is a best circle. It is a smallest circle that can be drawn to the cam profile means if you observe this figures in which this is a smallest circle that can be drawn from the cam profile. This is a cam profile. So, from the cam profile by taking the center of the cam, if you draw the circle that will give the smallest circle it is called as best circle. The best circle decides the overall size of the cam and thus it is fundamental features of the cam. This is a best circle. Then, the next term used in the cam is trace point. So, this is a trace point. See the definition of the trace point. It is a point on the followers and it is used to generate the pitch curve. So, it is a point on the follower. So, it is a center point of this roller. It is used to draw the pitch curve. The motion describing the movement of the follower. The motion of this trace point will describe the motion of the follower means follower will get reciprocate. So, how much height it achieves by the followers means the motion of the followers that is a up and down will decides by the trace point. So, this is a trace point. Then, next term used in the radial cam is pitch curve. So, already we are knowing the trace point and the cam profile. So, the pitch curve is nothing but it is a curve drawn by the trace point assuming that the cam is fixed up and the trace point of the follower rotates around the cam. Then, the curve generated by the locus of the trace point is called as pitch curve. So, I have shown this as a pitch curve. So, this curve is generated by the trace points by assuming that the cam is at stationary and we have to rotate these followers in the opposite direction of the cam. So, like this we are rotating the followers and whatever the curve is generated by this locus of the trace point this is called as the pitch curve. This is called as a pitch curve. Then, the next term used in the radial cam is pressure angle. See here, what is the pressure angle? The angle between the direction of the follower movement and the normal to the pitch curve at any point is called as a pressure angle. So, here we will observe the direction of the follower. Suppose, the followers is at these positions. Means, suppose the cam is at the stationary and we are rotating these followers around the cam profile. So, if suppose the follower is at this point. So, here I have located the follower motion is like this and then we have to draw the normal to the pitch curve. So, already we are knowing this is a pitch curve and we have to draw normal line to the pitch curve. So, this is normal line to this pitch curve. So, whatever the angle in between the follower motion and normal to the pitch curve is called as pressure angle. So, generally the pressure angle is kept in limit. If the pressure angle is too high then the follower will get jam in the bearing. So, it is very important terms to avoid the jamming of the followers in the bearing to maintain the pressure angle within limit. So, in this figure I have located the maximum pressure angles. So, how to define or how to find out the maximum pressure angles? We have to rotate these followers at around the this pitch curve and we have to draw the follower motion and normal to the pitch curve. So, we have to find out at every point on the pitch curve what is the pressure angle. So, we will find out the maximum pressure angle at one point. So, that is called as a maximum pressure angle. So, that the maximum pressure angles should be within limit to avoid the jamming action. The next term is pitch point. It is a point on the pitch curve having the maximum pressure angle. So, in the previous so in the previous slides we have seen the pressure angles and the maximum pressure angle. So, it is a point on which we are getting the maximum pressure angle that is called as pitch point. Next term is pitch circle. It is a circle drawn from the center of the cam through the pitch point. So, here in the previous slides we have seen what is in the pitch point. So, from this pitch point by considering the center of the cam this is the center of the cam if we will draw the circle. If we draw the circle that circle is called as pitch circle. The next term is a prime circle. The prime circle is the smallest circle that can be drawn. So, as to be tangential to the pitch curve with its center at cam center means what? This is a pitch curve from the pitch curve if you draw the smallest circle from the center of the cam. So, this is a center of the cam by considering the smallest distance of the pitch curves if you draw the circle this circle is called as prime circle. The next term used in the radial cam is lift or stroke. It is the maximum travel of the follower from lowest position to the topmost position. So, this is a total travel of the follower. Means what? When the cam will get rotates the follower will move or it will get reciprocates along this guide ways. So, the lift or the stroke is nothing but the motion of the follower from lowest position to the highest position. As the cam profile will get changed we are observing that the follower will move up and down. So, the lift or the stroke is nothing but the distance from minimum position of the follower to the maximum position of the follower. So, these are the terms used in the radial cam. So, for drawing the cam profile everybody should know the terms used in the cams. So, these are the references I have taken. Thank you.