Pdf cam mechanisms are integral parts of many products. Then, a new threemass, twodegreeoffreedom dynamic model was created. Cam mechanism is widely applied in industry because it can help achieve various complex motions of the follower via the cam contour design. An optimum design of cam mechanisms with roller follower. F mf af let s be the follower spring stiffness and xo the initial compression of the spring. The frictionforce is not constant because the contact. The exact profile of the cam can be obtained by taking observations. Cams can provide unusual and irregular motions that may be impossible with the other types of mechanisms.
Then the rates of change of velocity during impact as. There are three major parts in the setup as shown below. Introduction the cam analysis machinecam has been designed to enable students. Analysis and study of cam and follower through ansys.
Barrel ball input propulsion onoff mechanism cam and follower implementation cam and follower project group 1 jeff adkins brok dawley huynh ngoc lu guangyu alex nowysz the basics computer aided conceptual design and modeling of a device that uses cam and follower mechanism. Angle of cam rotation curve for different cam follower pairs. I have attached another file to understand the connection betwwen the cam and follower. If the mass and velocity of the follower as m1 and v1, and the cam mass velocity as m2 and v2 respectively. Analysis and usage of cams and their followers engineering essay. Tushar kiran et al analysis and simulation of cam follower mechanism using polynomial cam profile 214 int. This thesis is a analyzing of disk cam motion follower shape in horizontal position using. The coordinates of the visualized cam contour coordinates can be used in the cnc milling machine for the production of the real cam. A cam follower, also known as a track follower, is a specialized type of roller or needle bearing designed to follow cam lobe profiles. 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. If m is the effective mass of the follower, then the driving force required to accelerate the follower. Cam followers, roller followers select, configure, order. To study various type of cam and follower arrangements.
A flatfaced follower consists of a follower that is formed with a large, flat surface available to contact the cam. Cam and follower design basics design of cam profiles and. Mechanical engineering, theory of machines tagged with. Cam followers, roller followers misumi online shop select. Apr 18, 2018 variation of the cam follower connection force with cam rotation left and torque required to rotate the cam shaft right for different values of the valve spring stiffness. 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. Simulation model of cam follower mechanism with 345 polynomial cam profile. An optimum design of cam mechanisms with roller follower for. Norton, design of machinery introduction to cam design.
If the cup is raised off the gauge or no sound is heard, further adjustments are required. The presented computerized approach and the obtained results can be helpful for tolerance allocation tasks of disk cam mechanisms with a flatfaced follower. Error occur during the experiment compare to graphical method. The xo plot can be used to find out the velocity and acceleration of the follower system. The cf series cam follower includes lubrication holes on both ends of the stud and through a crossdrilled hole in the stud shank. It allows you to mate a cylinder, plane, or point to a series of tangent extruded faces, such as you would find on a cam. Explain what a cam is, how it is used, and the typical types of cams identify force closed and form closed followers and explain the benefits and limitations of each describe the primary types of cam motion programs introduction to cam design source. The accuracy of the output or the follower will depend on the cam and follower being in contact at all times. Group 1 cam and follower project by jeff adkins on prezi. The camfollower must accelerate and decelerate as the radius of the cam changes. For this experiment rotate the system manually for taking reading, arrange the set up. Experimental study of engine camfollowers enrico ciulli 1, bruno piccigallo 2, dagoberto vela 1department of mechanical, nuclear and manufacturing engineering, university of pisa, italy email.
Research article cam follower mechanism simulation. Softer or harder materials may result in decreased life, particularly under high loads. 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. Animation showing the displacement and velocity plot of the radial offset follower. Cam and follower lecture free download as powerpoint presentation. The cam follower pair is a very complex lubricated contact because its continuous variation of load, speed and radius of curvature. We will discuss the differential method for finding relation between the angular velocity of a cam and the linear velocity of a follower.
Cam are mounted on the end of a shaft driven by a variable speed motor. The follower shown in figure 4 c is a flatfaced follower. Maintenance free labyrinth seals enable maintenance free operations. A cam follower mate is a type of tangent or coincident mate. In radial cams, the follower reciprocates or translates in a direction perpendicular. Background and theory the cam follower experiment is a representation of a mechanical system in 4 which a cam is used to increase the mechanical efficiency of the system. Pdf analytic analysis of a cam mechanism researchgate. Learn fundamental concepts and terminology learn how to. However, the manufacturing of cams is expensive and the wear effect due to the. Click the link given below for further information regarding cam analysis machine and lab experiment pdf cam experiment.
The mating surface must be free of grease, oil and abrasive contaminants. Me 4201 machine design lab section 3 group 4 experiment 4 cam follower experiment jordan gautreau khalil hamed dallas amond michael mannino abstract a cam follower system is a very simple mechanism used to control and convert one type of motion to another type of motion. When you move the book smoothly upward, what happens to the pencil. Forceclosed models figure 103 shows the model of figure 102a and its free body diagram. Classification based on follower movement, synthesis of cam. Out of the four valve stiffness values, only 20 knm and 30 knm can enforce a continuous contact between the cam and follower. The following picture shows three followers which stay in contact with the cam as it rotates. Introduction the cam analysis machine cam has been designed to enable students. Basic radius r 0 disc and cylindrical cams motion length l c linear cams cam width b c roller radius r r roller width b r for follower shape cylinder eccentricity e disc cams for translating follower eccentricity angle. In this experiment if the angular displacement was large, that is over 10, then the motion of the. Here we are presenting some solved problems based on cam profiles. Can learn more about cam analysis experiment from link mentioned below. However, its performance is significantly affected by.
Cam and follower the cam and the follower have a line contact and constitute a higher pair. This allows significant reductions in processing and assembly manhours by avoiding alignment with the cam groove and precise machining of the. This article will discuss the calculation method of the velocity of cam follower. Take a pencil and a book to do an experiment as shown above. Background and theory the cam follower experiment is a. Mcgill cf1 34s cam follower, standard stud, sealedslotted. After the model was validated, a controlled impact and overtravel mechanism was designed, manufactured, and assembled to a simplified industrial cam follower system, the cam dynamic test machine cdtm. The time period, t, of the follower move up and down and cam rotation angle, can be measured and analyzed.
Analysis and simulation of cam follower mechanism using. The cam analysis machine cam has been designed to enable students. Most suitable as a guide roller for cam mechanisms and linear motion of automated machines and dedicated machines. The cam follower is a compact bearing with a highrigidity shaft and a builtin needle bearing. Cam followers are often used on conveyors, process transfer lines, such as those used int industries such as. To find out the angular displacement of various cam follower pairs. Please note that this manual explains all about the equipment including options. The dynamic synthesis and analysis of the one degree of freedom model, mechanism.
Linear and cylindrical cams for translating follower pivot distance y disc and linear cams for swinging arm arm length l a disc and linear cams for. The scheme of camfollower me hafig 1 shows the scheme of a camfollower mechanism. 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. Solved problems based on cam profiles engineering tutorials.
Cam is a very important topic in the kinematics of machines or theory of machines. However, the maximum possible angular acceleration of the camfollower is a function of its friction, radius, and inertia. Pdf mechanical error analysis of disk cam mechanisms with a. Although we checked the errors, but if you mark some error, let us known in the comment box. Classification based on follower movement assignment help, classification based on follower movement homework help, synthesis of cam follower system tutors. This type of follower can be used with a steep cam motion and does not jam. The cam follower must accelerate and decelerate as the radius of the cam changes. Cam follower with grease nipple a hex wrench can be used to. In future, the analytical results will be complemented by experiment. The cam transfers rotational motion into linear motion by rotating the cam by a shaft connected to an electric motor. Mar 18, 20 cam is a very important topic in the kinematics of machines or theory of machines. The unit can be installed and maintained without concern for installation space, thereby boosting operating e. The velocity of any cam follower can be calculated using the deferential method provided you have the equation relating the angular. However, the maximum possible angular acceleration of the cam follower is a function of its friction, radius, and inertia.
Cam and follower systems are used in many common applications such as pumps and in the camshaft of an engine. The scheme of cam follower me hafig 1 shows the scheme of a cam follower mechanism. Feb 03, 2016 however, a roller follower can possibly jam during steep cam displacements. An experimental study of the effects of cam speeds on cam. It is normally connected with a prime mover, which rotates it. Pdf cam and follower are widely used in regulating, opening and closing of valves inlet and. Cam mechanisms are widely used because with them, different types of motion can be possible.
Cam analysis apparatus machines mechanical engineering. Make the book an inclined plane and use the pencil as a slider use your hand as a guide. More than 14 million products are available in our online shop. The camfollower pair is a very complex lubricated contact because its continuous variation of load, speed and radius of curvature. Long life a special thrust washer with improved antiseizure properties of the sliding surface bearing interior is utilized. Fmx ks x cs x kx cx mx x cc m x kk m x k m s c m s. Hsu department of mechanical engineering, kung shah institute of technology and. Towards the motion of this event, the cam performance can be determined due to horizontal position of the cam and follower system. A cam follower, also known as a track follower,1 is a specialized type of roller or needle bearing designed to follow cams.
Camfollower report final me 4201 machine design lab. Oct 28, 2017 stylus pen attached to the follower traces the follower lift on teledeltos paper mounted on a drum. 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. Experimental analyses are done with the objectives of. The dynamic synthesis and analysis of the one degree of freedom model, mechanism and machine theory, volume 11, issue 4, pages 247257.
The frictionforce is not constant because the contactforce is not constant, and lubrication is not steady. Cam follower mechanical engineering general discussion. The equation of motion for the system is found from newtons second law. Rbc roller cam followers rbc bearings unique design. Tsai department of mechanical engineering, national cheng kung university, tainan 70101, taiwan, republic of china m. Cam followers with an outer diameter size of 1116 inches or smaller can be relubricated only through the flange end of the stud. Cam follower definition of cam follower by the free dictionary.
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