They are based on either needle or cylindrical roller bearings. Cam are mounted on the end of a shaft driven by a variable speed motor. To get familiar with the most common types of planar rotary cams by using a software. Rotating cam rotating follower figure 69 simdesign oscillating cam. Tushar kiran et al analysis and simulation of cam follower mechanism using polynomial cam profile 214 int. Instead of an inner ring, they have a threaded solid stud pin. Depending upon the accuracy the cam follower are selected and according to speed variation. 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. Mcgill camrol cam follower bearings ahr international. Equipment description of experimental apparatus cam and tappet device is used to measure and analyse the effect of various followers and tappet motions on different types of cam. The time period, t, of the follower move up and down and cam. Cam follower friction experiment mixed lubrication regime nonlinear dynamics abstract a new dynamic experiment is proposed to estimate the coefficient of friction for a mechanical system with a combined rollingsliding contact under a mixed lubrication regime. The output accuracy of the system corresponds to the motion of the follower.
If m is the effective mass of the follower, then the driving force required to accelerate the follower. Comparison of a range of follower on an eccentric circular cam. Then, a new threemass, twodegreeoffreedom dynamic model was created. Cam and follower systems are used in many common applications such as pumps and in the camshaft of an engine. The exact profile of the cam can be obtained by taking observations. 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. A cam is a mechanical member used to impart desired motion to a follower by direct contact. One or the other motion will depend on the configuration of the mechanism and, specifically, on the position of the follower with regard to either the cam or eccentric profile. A c a m and the follower co m bination belong to the category of higher pairs. Cams can provide unusual and irregular motions that may be impossible with the other types of mechanisms. Drawing cam profile for a given motion curve of the follower.
This is a plate cam with the follower riding in a groove in the face of the cam. Practical experiment instructions sheet lab manual exp. Hsu department of mechanical engineering, kung shah institute of technology. Abrupt changes in velocity with highspeed cams result in large accelerations and cause the. M and constant acceleration cams with a roller follower. A project report on cam follower utility in internal. The cam analysis machine cam has been designed to enable students. Such followers constitute cam follower mechanisms, which transform the circular motion of the cam into a linear or angular motion of the follower.
The experiment is designed and instrumented based on an analogous contact. Cam a sliding or rotating of mechanical device used for transformation of rotary motion into oscillatory motion or vice versa t o a second body, which is called as follower, which in contact. 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. It becomes a twodof system once the cam and follower. Tsai department of mechanical engineering, national cheng kung university, tainan 70101, taiwan, republic of china m. 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. The analysis process also focus on the jump force of follower, that effect of vibration factor in cam mechanism system. The revolutions per minute of the cam shaft were recorded each time the springs and. 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. A cam follower mechanism is a sliding piece on a linkage that is used to convert rotary motion into linear motion or viceversa. Dynamic study of the cams by obtaining the jerk angle of a cam presented in the miniature model. The accuracy of the output or the follower will depend on the cam and follower being in contact at. A follower is a component which is designed to move up and down as it follows the edge of the cam.
Introduction the cam analysis machine cam has been designed to enable students. Accuracy cam followers are manufactured with the dimensional tolerances shown in table 4. Knief edge follower, roller follower, spherical follower, flat faced follower. 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. Providing the cam and follower remain in contact, this is a one degreeoffreedom dof system. Towards the motion of this event, the cam performance can be determined due to horizontal position of the cam and follower system. Mechanical error analysis of disk cam mechanisms with a.
A high voltage stylus pen attached to the follower traces the follower lift on teledeltos paper mounted on a drum. The current cam and follower mechanism in four stroke internal combustion engine employs a flat follower. The cam follower is supported by a rigid frame which controls the motion and keep safe the device from irregular motions and damage. For this experiment rotate the system manually for taking reading, arrange the set up. Cam follower motions engineering drawing joshua nava arts. Experimental analyses are done with the objectives of.
During analysis data will be process, high speed will be select from the types of speed of cam in follower system. Study of a cam and its follower movement according to the displacement diagram and lay out theoretical and actual cam profile. Typical industrial cam follower systems include a force closed cam joint and a follower train containing both substantial mass and stiffness. F mf af let s be the follower spring stiffness and xo the initial compression of the spring. In this work an attempt is made to change the flat face of follower to a curved face follower, so that the required point contact can be achieved. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Terms used in cam and follower theory of machine youtube. Rotating cam, translating follower figure 68 simdesign translating cam. Cams theory of machines engineering reference with. A cam follower, also known as a track follower, is a specialized type of roller or needle bearing designed to follow cam lobe profiles. Autodesk inventor cam follower project tutorial please subscribe duration. Basic cam motion curves in this section some well known motion curves will be explained for the rise portion of the motion curve only.
Cam follower introduction a cam follower mechanism is a. A translating or a swing arm follower must be constrained to maintain contact with the cam profile. Group 1 cam and follower project by jeff adkins on prezi. Camfollower report final me 4201 machine design lab. As line contact between existing cam and follower mechanism results in high frictional losses which results in low mechanical.
In addition to the weight varying, the springs along the follower, holding the weight, were changed throughout the experiment. Simulation model of cam follower mechanism with 345 polynomial cam profile. However constant contact is not possible, at a certain speed 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. Part of a uniformvelocity cam graph is shown in fig. A1928 basically the same as the popular type cam follower, this model is provided with tapped holes for piping on the stud head and the thread. Title to study various types of cam and follower arrangements.
Analysis and simulation of cam follower mechanism using. Cam and followers are mainly used to transfer rotory motion cam into reciprocating of oscillating motion of follower. The motion of the follower from a given cam profile the motion imparted to the follower by a given cam profile may be determined graphically using the reverse process that was described in the last paragraph. The topic is a part of the theory of machine stream that deals with the study of the elements of a machine like links. Cam follower with a tapped hole for greasing model cft speci. Cam mechanisms are widely used because with them, different types of motion can be possible. The video explains the entire construction and working of a cam and follower.
The accuracy for this system is depended upon the cam and follower being in contact at all times. 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. 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. What is cam and follower types of followers explained. Mcgill offers the broadest range of cam follower bearings in the marketplace. Clearance the radial internal clearances of cam followers are shown in table 4. However, the manufacturing of cams is expensive and the wear effect due to the.
A camfollower system is a very simple mechanism that is used for control and conversion of one type of motion to another. There are three major parts in the setup as shown below. The follower moves in a plane perpendicular to the axis of rotation of the camshaft. Mcgill is the one source solution for all your cam follower needs. The revolutions per minute of the cam shaft were recorded each.
Nut, washer, and grease nipple are available as accessories. A cam is a m echanical m e m ber used to i m part d esired motion to a f ollower b y direct contact. The cam transfers rotational motion into linear motion by rotating the cam. Background and theory the cam follower experiment is a. The cam follower is might be gravity type or spring loaded. The cam may be rotating or r e c i pro c ating where a s the f oll o wer m ay be rot a tin g, reciprocating or oscillating.
The xo plot can be used to find out the velocity and acceleration of the follower system. The contact load between cam and follower was set 930 n in maximum value with an adjusting device of valve spring assembly. Follower is rollertype follower makes offset translation follower radius is given base circle radius is given. Ppt cam and follower powerpoint presentation free to. Research article cam follower mechanism simulation.
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