Cam follower design pdf

Pdf this paper presents a profile design method for a new cam mechanism called breadth cam. The cam and the follower have a line contact and constitute a higher pair. A cam is a mechanical device used to transmit motion to a follower by direct contact. Locating the trace point is important because the locus of. Design of the cam transferred to a template or master. The cam profile bb is a product of the enveloping motion of a series of rollers. A cam follower is a bearing that incorporates needle style. This video shall demonstrate the process of designing a plate cam to achieve a desired motion of the follower. A profile for a rotating cam is shown in figure 12. 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. The basic purpose of using the cam follower is converting the rotary motion of the cam to the translating or oscillatory motion of the follower.

Design of cam and follower system using basic and synthetic curves. In this case we want to keep the radius of the cam as shorter as possible to minimize this effect. The fundamental principle in designing the cam profiles is still inversion, similar to that that for designing other cam mechanisms, e. Cam arrangements, involving a cam and a cam follower, are used in various applications to translate rotational movement into linear movement. Parametric studies of both centrally pivoted and end pivoted follower. Pdf design evaluation of a follower cam with variable valve lift. Whether you use cam follower bearings for cam followers, or for track, guide, or support rollers, their performance depends largely on the type you. Cams can provide unusual and irregular motions that may be impossible with the other types of mechanisms. In hydraulic systems, the main mechanism is cam and follower mechanism.

This paper presents a software tool for teaching the kinematics, design and analysis of cam and follower mechanisms used in the undergraduate mechanisms. Normally, the follower oscillates when the cam turns. Analytix cams enables mechanical engineers to quickly synthesize a cam profile given their follower motion requirements. The most common camfollower design employs needle rollers to carry high radial loads. This moment tends to jam the follower in its guides. They also have generated figures of cam profiles as enve. Cam is a very important topic in the kinematics of machines or theory of machines.

In this work an attempt is made to change the flat face of follower to a curved face follower. This is the maximum distance that the cam pushes the follower when the valve is open. Norton, design of machinery introduction to cam design. Although we checked the errors, but if you mark some error, let us known in the comment box. If there is a jam, the camfollower cannot return move with the cam. However, the maximum possible angular acceleration of the camfollower is a function of its friction, radius, and inertia. The paper presents an original method to determine the efficiency of a mechanism with cam and follower. In this tutorial,weve tried to follow the standard procedure of designing a cam. The velocity of any cam follower can be calculated using the deferential method provided you have the equation relating the angular. Figure 616 the trace point of the follower on a disk cam. Camrol cam follower bearings camrol the industry standard in 1937, mcgill engineers invented the first needle bearing cam follower. Overview the typical functions of a cam follower are to provide antifriction support of linear movement or to follow the surface of a cam. Modelling, design and analysis of cam and follower a.

Before going to the actual design of cam profile, lets look at the basic terminologies. The parts of the camshaft that create the valve movement. Call us today about your application, other materials and custom designs are available to meet your specific need. Rise is the motion of the follower away from the cam center, dwell. In that case, the mechanism is dependent on the fluid pressure. The cam, while rotating, pushes the follower along a linear rail. A breadth cam gets its name because the centers of the. During the process of designing camfollower mechanisms, the designers must select or synthesize the motion curve for the desired output positions of the.

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. C a m f o l l o w e 5 6 cf variety and originality cam follower series with reliability and actual operation results cam follower series with a nd c tulop eri s full product lineup to page to page to page to page to page 7 the product lineup including the miniature type with. Thats the inverse of one cam follower running in a sinuous groove. The cam is usually located on shafts and rotates at the uniform speed, whereas the follower motion will be based on the. The cam follower is a compact bearing with a highrigidity shaft and a builtin needle bearing. Cams are critical components in many different industrial applications, and can allow for a great deal of control based on the cam profile. This article will discuss the calculation method of the velocity of cam follower. A cam is an element of the camfollower mechanical system that compels the movement. Oh, it would be nice if it a free trial was available. This bending creates an outer ring deformation with reversed bending stresses. This analysis is an important step for fixing an optimum size of a cam and. Here we are presenting some solved problems based on cam profiles.

However, the manufacturing of cams is expensive and the wear effect due to the. The camfollower must accelerate and decelerate as the radius of the cam changes. Calculate the pitch curve aa, that is, the trace of the pitch point in the inverted mechanism. Choose from assorted cam follower types, including full complement needle rollers, stud, heavy stud, crowned and yoke. The camrol cam follower from mcgill was designed to withstand the intermittent shock, loading. Automated types of machinery, cam and follower are used in different parts which are automated in motion.

A197 cam follower eccentric cam follower models cfhab, cfha speci. Cam follower speed limit rpm rbc roller cam followers. A general background to the consideration of tribological factors in cam and follower design is presented as a prelude to the description of the development of computer software for the analysis of the lubrication of any cam and tappet form. The originality of this method consists of eliminating the friction modulus. 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 trace point and pitch curve. A familiar example is the camshaft of an automobile engine, where the cams drive the push. The remainder of the stud is not hardened resulting in a ductile stem that provides toughness. However, it was the genius of leonardo da vinci that produced a modern design cam applied to a machine for pumping water. Cam mechanisms are widely used because with them, different types of motion can be possible. But stud cam followers are indispensable in an array of applications including those that are subject to high loads.

They are based on either needle or cylindrical roller bearings. The driver is called the cam and the driven member is called the follower. 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. When the motion between the two elements is partly turning and partly sliding, then the pair is known as a higher pair. Your proven service leader with reliable delivery since 1972. Introduction of cams and types of cam and followers. Most suitable as a guide roller for cam mechanisms and linear motion of automated machines and dedicated machines. This is likely to prevent further damage to the mechanisms.

We will discuss the differential method for finding relation between the angular velocity of a cam and the linear velocity of a follower. Rbc roller cam followers rbc bearings unique design. Mcgill camrol cam follower bearings ahr international. Iko designs and manufactures a broad selection of cam followers to meet the diverse needs of applications including machine tools, industrial robots, electronic parts production and office automation equipment. Instead of an inner ring, they have a threaded solid stud pin. Each cam has its own roller, but the rollers are mounted on the same reciprocating or oscillating follower. Selecting and applying cam follower bearings machine design. Cam followers, also referred to as track rollers, are specialized bearings that are supported from a single point on their circumference. During the process of designing cam follower mechanisms, the designers must select or synthesize the motion curve for the desired output positions of the follower and the dynamic responses of the system, and then design the cam profiles mabie and reinholtz, 1987. Cam follower general catalog a product descriptions features and types a194 features of the cam follower a194 structure and. A projection on a rotating part in machinery, designed to make sliding contact with another part while rotating and to impart reciprocal or variable motion to it.

Cam and follower design basics design of cam profiles. Basics of cam followers including those for linear motion. Comparison of dynamic capacity rbc roller cam followers needle roller cam followers lbf. Pdf purpose the purpose of this paper is to present a methodology for design, analysis and evaluation of camfollower systems used for the control. The cam follower design includes a stainless steel shaft and lubricant free plastic roller where precision ball bearings are enclosed and lubricated for life. On the point of contact, singular roller forces create a bending of the outer ring. Flat cam follower heavy stud type heavy stud camrol series, 1. Cam followers and track rollers from grainger can withstand a variety of mechanical applications. Inner studs are induction heat treated in the roller path and flange surfaces only. The cam is deigned for a roller follower which is set radially. If a barrel cam is to run quietly while carrying a heavy load at speed, the curves must be very precise which requires specialized cam design software software which deals with things like acceleration.

Graphically when laying out the cam profile, first the successive positions of the follower according to the cam motion curve is drawn while keeping the cam fixed. A teaching tool for design and analysis of cam and follower. You can see an application of the cam follower in another article here about the internal combustion engine. As the cam rotates the flat face of the follower will rise, dwell, return, and then dwell. That model is sufficient for determining and thus avoiding by design the condition of gross follower jump due to inadequate. During the process of designing camfollower mechanisms, the designers must select or synthesize the motion curve for the desired output positions of the follower and the dynamic responses of the system, and then design the cam profiles mabie and reinholtz, 1987. Mcgill is the one source solution for all your cam follower needs. This concept is important in cam profile design and is called the trace point of follower.

The frictionforce is not constant because the contact. In a cam follower pair, the cam normally rotates while the follower may translate or oscillate. Patel me scholar, department of mechanical engineering, north maharashtra university, jalgaon abstract the objective of this paper is to modelling design and analysis of a cam and follower. Pdf breadth cam profile design with oscillating roller follower. A heavysectioned outer race design to help withstand shock loading of cam follower operation. One basic rule in cam design is that this motion curve must be continuous and the first and.