The follower shown in figure 4 c is a flatfaced follower. Madhusudan rao department of mechanical engineering,iit delhi. The following terminologies are used to draw cam profile. The data required for various functions are passed from one application software to another in a seamless manner. Nptel video lectures, iit video lectures online, nptel youtube lectures. Clevis mounting provides support on both sides of the cam follower and permits use of a high strength pin.
Additionally, misumi offers a variety of cad data for free download. Cams classification of cams and followers, nomenclature, description and analysis of follower motion, pressure angle. Asok kumar mallik department of mechanical engineering iit kanpur. The driver is called the cam and the driven member is called the follower. After the model was validated, a controlled impact and overtravel mechanism was designed, manufactured, and assembled to a simplified industrial camfollower system, the cam dynamic test machine cdtm. Since the cam follower is supported in a cantilever position, the mounting hole diameter should be prepared without play between the stud and the hole especially when heavy shock loads are applied. During the other half revolution of the cam, the follower rises and then falls. Theory of machines institute of advanced studies in. Nptel syllabus kinematics of machines video course s.
How to download notes directly in pdf format from nptel. Module 12 4 hr determine of basic dimensions and synthesis of cam profiles, graphical and analytical methods, cams with specified contours. The coordinates of the visualized cam contour coordinates can be used in the cnc milling machine for the production of the real cam. Cam and follower design basics design of cam profiles and. Sep 09, 2018 majority of video courses on nptel do not offer lecture notes for download. Majority of video courses on nptel do not offer lecture notes for download. What are the applications of different types of cam. Cam followers skf cam followers studtype track rollers are designed to run on all types of tracks and to be used in cam drives, conveyor systems, etc. Cam followers come in a vast array of different configurations, however the most defining characteristic is how the cam follower mounts to its mating part. This type of follower can be used with a steep cam motion and does not jam.
Simulation model of cam follower mechanism with 345 polynomial cam profile. When the flanks of the cam connecting the nose and base circles are of convex circular. Ribbed barrel cam with oscillating roller follower. Cam follower nominal life the basic static load rating c 0 refers to the static load with constant direction and magnitude, under which the calculated contact stress in the center of the contact area between the roller and the raceway under the maximum load is 4000 mpa. Cams and followers video lecture from chapter cams and followers in theory of machine for mechanical engineering students. Models with stud diameters ranging from 3 to 30 mm are prepared, and are suitable for a. Although we checked the errors, but if you mark some error, let us known in the comment box.
A cam is a mechanical device used to transmit motion to a follower by direct contact. A familiar example is the camshaft of an automobile engine, where the cams drive the push. A cam follower, also known as a track follower, is a specialized type of roller or needle bearing designed to follow cam lobe profiles. Solved problems based on cam profiles engineering tutorials. A flatfaced follower consists of a follower that is formed with a large, flat surface available to contact the cam. For example, the product data is created during design. Lower and higher pairs, degrees of freedom, various types of mechanisms, their inversions and. The scheme of cam follower me hafig 1 shows the scheme of a cam follower mechanism. A frame is one which supports the cam and guides the follower. Introduction of cams and types of cam and followers. Design of cam and follower system using basic and synthetic. In a cam follower pair, the cam normally rotates while the follower may translate or oscillate. The follower is known as a radial follower if the line of. Cam and follower definition and types explained with images.
It is normally connected with a prime mover, which rotates it. How to download notes directly in pdf format from nptel quora. With the rotation of the cam, the follower the shaft with the roller at bottom in the above picture gets oscillated or translated according to the profile of the cam. In this case we want to keep the radius of the cam as shorter as possible to minimize this effect. A familiar example is the camshaft of an automobile engine. When the flanks of the cam connecting the nose and base circles are of convex circular arc, such cams are referred as circular arc cams. Cam is a very important topic in the kinematics of machines or theory of machines. Cam introduction, classification of cam and follower based on different aspects, follower motion, derivation of velocity, acceleration and jerk for different cases, tangent cam with roller.
One response to kinematics of the camfollower mechanism. Module 10 lecture 1 kinematics of machines youtube. The velocity of any cam follower can be calculated using the deferential method provided you have the equation relating the angular. Learn fundamental concepts and terminology learn how to. Application of cam and follower types of cams types of cam followers concept and definition. The follower system revolves with respect to the center line of the vertical shaft. This moment tends to jam the follower in its guides. Accelerating the mass of the outer ring normally requires the largest part of moment mt. Instead of an inner ring, they have a threaded solid stud pin. Example of cam action concept and definition of cam. They are based on either needle or cylindrical roller bearings. A cam follower roller bearing also called track follower is a specialty roller bearing designed to follow tracks or cams and in a wide range of linear motion systems. Module 3 hr gears terminology, fundamental law of gearing, involute profile.
Standard type cam followers these are the basic type bearings in cam follower series. The scheme of camfollower me hafig 1 shows the scheme of a camfollower mechanism. Mar 24, 2019 cam and follower combination belongs to the category of higher pairs. Cam is a rotating element which provides an oscillation or reciprocatory motion to another part connected with the cam. Consider a cam with a follower that rises with a parabolic motion from a dwell to another dwell such that the total lift is and the total rotation angle is. A cam is a rotating machine element which gives reciprocating or oscillating motion to another element known as follower. Clearance the radial internal clearances of cam followers are shown in table 4. Nptel syllabus kinematics of machines video course s note on the model curriculum prepared by aicte five of the seven topics listed under the heading kinematics of machine belongs to dynamics. Mar 18, 20 cam is a very important topic in the kinematics of machines or theory of machines. Yoke type cam followers are available with and without seals, and with crowned outer rings. A follower controlled by a pearshaped cam remains motionless for about half a revolution of the cam. The base circle is the smallest circle with its centre at the cam centre that can be drawn tangential to the cam. This video explains the concept of cam and follower mechanism used in an engine, with the help of a live example that shall prove to be helpful for engineering students.
They are particularly useful for reducing clearance or. Feb 03, 2016 however, a roller follower can possibly jam during steep cam displacements. Analysis and simulation of cam follower mechanism using. Cam and follower mechanism is a widely used method of motion transformation. Cams can provide unusual and irregular motions that may be impossible with the other types of mechanisms.
Balancing on the other hand, the model curriculum of. Here we are presenting some solved problems based on cam profiles. Internal combustion engine to close and open the outlet valve and intake valve. Norton, design of machinery introduction to cam design. We will discuss the differential method for finding relation between the angular velocity of a cam and the linear velocity of a follower. There are so many different applications of cam and follower mechanism. In this type, as the cam rotates, the follower reciprocates or translates in the guides.
Tushar kiran et al analysis and simulation of cam follower mechanism using polynomial cam profile 214 int. Cam and follower mechanism and their types mechanicalmaster. Computer integrated manufacturing cim encompasses the entire range of product development and manufacturing activities with all the functions being carried out with the help of dedicated software packages. This article will discuss the calculation method of the velocity of cam follower. Cam followers, roller followers misumi online shop. The cam and the follower have a line contact and constitute a higher pair.
Another part associated with the cam is called follower. Radial or disc cams a cam in which the follower moves radially from the centre of rotation of the cam is known as a radial or a disc cam fig. Cam followers, roller followers select, configure, order. What are the applications of different types of cam followers. Cam and follower lecture free download as powerpoint presentation. Then, a new threemass, twodegreeoffreedom dynamic model was created. The relevance and role of cams in modern machine systems has made their continuous study necessary and. Cam follower roller bearings stud type track follower. Cam follower analysis cams introduction a cam is a mechanical device used to transmit motion to a follower by direct contact. During the time that the follower is stationary, the cam is in a dwell period. Computer aided design nptel online videos, courses iit. Straight edged cam or tangent cam circular arc cam. This is likely to prevent further damage to the mechanisms.
Cam and follower design basics design of cam profiles. Computer aided design lecture series on computer aided design by dr. Cam of two followers cam follower cam followers cad. Cam followers, roller followers misumi online shop select. Cam followers are often used on conveyors, process transfer lines, such as those used int industries such as. Jan 24, 2008 lecture series on kinematics of machines by prof. Cams cam a mechanical device used to transmit motion to a follower by direct contact.
Follower driven in a cam follower pair, the cam normally rotates while the follower may translate or oscillate. Mechanical engineering kinematics of machines nptel. Me 316 kdom department academic mentorship program. The cam drives the two tools positively away from the danger zone the plunger is moved to the left, and the workhead is moved upwards. The follower arm swings or oscillates in a circular arc with respect to the follower pivot. If there is a jam, the camfollower cannot return move with the cam. Some courses might have presentations or quiz papers uploaded, but rest of them just have transcripts which is pretty useless to refer as notes. Skf cam followers studtype track rollers are designed to run on all types of tracks and to be used in cam drives, conveyor systems, etc. Cam mechanisms are widely used because with them, different types of motion can be possible. Automated types of machinery, cam and follower are used in different parts which are automated in motion. Camcentric adjustable cam followers are used where accurate positioning is required.
787 293 1343 892 468 1254 907 1414 1068 1491 484 61 1203 123 657 1560 1337 1265 304 1481 325 960 298 1536 1254 1231 1050 738 1436 1161 413