File Name: types of cam and follower ppt to .zip
Concept and Definition of Cam. The cam and follower has a point or line contact constitute a higher pair. ORA cam is a mechanical component of a machine that is used to transmit motion to another component, called the follower, through a prescribed motion program by direct contact.
Cam is a driver member and follower is a driven member. This may be connected directly to the follower, or connected through linkages and gearing. The cam mechanism is a versatile one.
It can be designed to produce almost unlimited types of motioning the follower. It is used to transform a rotary motion into a translating or oscillating motion. On certain occasions, it is also used to transform one translating or oscillating motion into a different translating or oscillating motion.
Cams are used in a wide variety of automatic machines and instruments. Typical examples of their usage include textile machineries, computers, printing presses, food processing machines, internal combustion engines, and countless other automatic machines, control systems and devices. The cam mechanism is indeed a very important component in modern mechanization. Concentric disc: Concentric disc: A concentric disc attached to a rotating shaft would have its axis of rotation coinciding with its geometric center.
For example, they are used on motor car camshafts to operate the engine valves. A follower controlled by a pear-shaped cam remains motionless for about half a revolution of the cam. During the time that the follower is stationary, the cam is in a dwell period.
During the other half revolution of the cam, the follower rises and then falls. As the pearshaped cam is symmetrical, the rise motion is the same as the fall motion. Edge cams Edge camsIt must be appreciated that this type of cam, where the follower is in contact with the edge of the cam disc, is only capable of imparting positive motion to its follower in one direction, that is, during the rise portion of the cam movement. During the fall portion of the cam movement the follower must be maintained in contact with the cam either by the mass of the follower and its mechanism or, more usually, by a spring.
Both methods have their advantages. A groove can be milled in the face of cam discs. As the cam rotates, a follower located in the groove has its motion guided by the groove. This type of cam is called a box cam. Cylindrical cams: Cylindrical cams: Cylindrical cams are used when motion has to be transmitted parallel to the axis of rotation of the cam. The cylindrical or barrel cam consists of a rotating cylinder with a helical screw shaped groove in its curved surface.
A follower with a tapered roller end is located in the groove. As the cylinder turns, the follower moves in a straight line parallel to the axis of the rotation barrel cam. This type of cam is often used to guide thread on sewing machines, looms and fabric making machines. The cam profile is a circle. The center of rotation of the cam is often from the geometric center of the circle. The circular cam produces a smooth form of motion called a simple harmonic motion. These cams are often used to produce motion in pumps.
Circular cams are often used to operate steam engine valves. As the cam is symmetrical, the rise and fall motions are the same. Heart-shaped cams are essential when the follower motion needs to be uniform or steady as, for example, in the mechanism that winds thread evenly on the bobbin of a sewing machine.
A heart-shaped cam can be used for winding wire evenly on the former of a solenoid. The follower gains and looses velocity at a constant rate. Uniform acceleration and retardation cams are used to controls the motion of linkages in complex machinery.
Types of Cam Followers Types of Cam FollowersThere are three types of cam followers, and since the type of follower influences the profile of the cam it is worthwhile considering the advantages and disadvantages of each type. The three types are the knife-edge, the roller follower and the flatfoot or mushroom follower. The Knife Edge Follower: The Knife Edge Follower:that impart motion to the follower in a plane in line with the axis of rotation of the cam as does a cylindrical cam.
Group b:Cams that impart motion to the follower in a plane at 90 degrees to the axis of rotation, as with face or edge cams. Most cams fall into this category. This is the simplest type, is not often used due to the rapid rate of wear. When it is adopted, it is usually for reciprocating motion, running in slides and there is considerable side thrust, this being a component of the thrust from the cam. Related Papers. By laxmana raju. By Prabir Datta. By Oyinkeprebi Empere. By Romero stillalone.
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The cam appears to have no dynamic forces or stresses in it! In the Figure, only the rise portion in blue is shown. The peak value is 6. Derive below equation using the same procedure as discussed in the last three slides. Open navigation menu. Close suggestions Search Search.
Figure Simple Cam experiment Take a pencil and a book to do an experiment as shown above. Make the book an inclined plane and use the pencil as a slider use your hand as a guide. When you move the book smoothly upward, what happens to the pencil?
A cam is a rotating machine element which gives reciprocating or oscillating motion to another element known as follower. The cam and follower have a point or line contact constituting a higher pair. The contact between them is maintained by an external force which is generally provided by a spring or sometimes by the weight of the follower itself when it is sufficient. The cam converts rotary motion of one element into reciprocating linear motion or into oscillatory motion. The cam is the driver member and the follower is the driven member. The cam and follower mechanism is widely used for operating the inlet and exhaust valves of internal combustion engines.
Cam - A mechanical device used to transmit motion to a follower by direct contact. Cam — driver; Follower - driven In a cam - follower pair, the cam normally rotates while the follower may translate or oscillate. Cams are used to convert rotary motion into reciprocating motion. Three elements of the cam. In IC engines to operate the inlet and exhaust valves. CAMS Follower motions having almost any desired characteristics are not difficult to design.
Also, you can download the free PDF file of this article at the end of it. Cam and follower are a pair of higher links that are used to move links directly or periodically. It is used to decrease the degree of error. In the third century, the device known as the cam was produced by Hellenistic water-powered automata. In addition, the device was found in al-Jazari design in the 4th century.
In mechanical engineering, engineers often use a higher pair links mechanism that is renowned as Cam and Follower Mechanism. This pair of higher links are used to move links spontaneously or periodically. Although, cam and follower mechanisms are also used by engineers for ensuring zero or minimum degree of error. The device that is known as Cam in the 3rd century was devised by Hellenistic water-driven automata. Alongside, that device was found in the 4th century in Al-jazari design.
Халохот шарил по полу, нащупывая пистолет.
Сегодняшний день стал для него днем сплошных фиаско. То, что началось как в высшей степени патриотическая миссия, самым неожиданным образом вышло из-под контроля. Коммандер был вынужден принимать невероятные решения, совершать чудовищные поступки, на которые, как ему казалось раньше, не был способен. Это единственное решение.
Чатрукьяну была известна история ее создания. Несмотря на все предпринятые в конце 1970-х годов усилия министерства обороны сохранить Интернет для себя, этот инструмент оказался настолько соблазнительным, что не мог не привлечь к себе внимания всего общества. Со временем им заинтересовались университеты, а вскоре после этого появились и коммерческие серверы. Шлюзы открылись - в Интернет хлынула публика.
Она зажмурилась. - Попробую угадать. Безвкусное золотое кольцо с надписью по-латыни. - Нет. - Он усмехнулся.
Джабба презрительно хмыкнул. - У вирусов есть линии размножения, приятель. Тут ничего такого .
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