Draw the profile of cam, if the axis of follower passes through the axis of cam. through 40 mm in of revolution, keep it fully raised through 1/10 th 1 th 4 revolution and to lower it with uniform acceleration and retardation in 1/6 th revolution. Return of cam also takes place with uniform motion during remaining half of cam revolution. the plate cam profiles for these different motions and different followers. Types of Cam Followers There 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 follower again turns to its original position with velocity during next half of three revolution . In order to have acceleration in beginning and retardation at the end of stroke within the finite limits. Emphasise direction. Draw the profile of a cam with oscillating roller follower for the following motion : (a) Follower to move outwards through an angular displacement of 20° during 120° of cam rota- tion. 7. (M/J 2009) The four profiles normally used in cams are i. Determine the maximum velocity and acceleration during rise and return if the cam rotates anti-clockwise at 900 rpm. Uniform acceleration and uniform retardation. Assume minimum radius of cam as 25 mm. A cam and follower mechanism has the following motion: (i) the follower moves out by 35 mm for 120 0 of cam rotation with uniform acceleration and retardation. A cam rotating clockwise at a uniform speed of 200 r.p.m. 13. Draw a cam profile to drive an oscillating roller follower to the specifications given below: a. Follower to move outwards through an angular displacement of 20° during first 120° rotation of cam b. 12. the cam profile are same whereas for a roller follower, they are separated by the radius of the roller. Introduction This must be done at a scale of 1:1 to use it to generate the cam profile. with Uniform Acceleration and Retardation. The minimum radius of the cam is 25 mm. In a cam drive with uniform velocity follower, the sharp corners of the displacement diagram are rounded off at the beginning and at the end of each stroke. Keywords: Main parameters, cam profile, acceleration jump, cam follower, valve spring * Corresponding author: Oguzhan Yildiz. Assuming that, there is no dwell between the ascent and descent, determine the lift of the valve, the flank radius and the acceleration and retardation of the follower at a point where circular nose Draw the cam profile for conditions same with follower off set to right of cam center by 5mm and cam rotating counter clockwise. Construct radial plate cams of given uniform velocity, simple harmonic motion, uniform acceleration and retardation to in-line knife-edge followers. A follower with Uniform Acceleration and Retardation (UAR) will accelerate and decellerate at the same rate. If the clutch is an old clutch, then uniform rate of wear assumption is more valid. 9. 3. Draw the profile of disc cam to give uniform acceleration and retardation out stroke of 25 to a knife edge follower during first half of revolution. Tangent Cam with Reciprocating Roller Follower. The cams are usually rotated at uniform speed by a shaft, ... in contact with the nose of cam. The motion may be uniform and/or simple harmonic and/or uniform acceleration and retardation. Simple harmonic motion, and 3. = 25 mm; Angle of action of cam = 150o and cam shaft speed = 600 rpm. 8. Construction of Cam Profiles. The … The displacement, velocity and acceleration diagrams are plotted for one cycle of operation i.e., one rotation of the cam. ... Follower Moves with Uniform Acceleration & Retardation 12/25/2015 Shown over is the outline of a cam with UAR rise and UAR fall. (ii) Follower to dwell for 60o of cam rotation. Understand the applications for all the curves constructed. 1.1 Definitions Related to Cam: The following terminologies are used to draw cam profile. Uniform acceleration and retardation and iv. In a cam drive with uniform velocity follower, ... Because of difficulty in manufacturing cam profile. Types of motion of the follower • Uniform velocity • Uniform acceleration and retardation • Simple harmonic motion • Cycloidal motion 7 Uniform velocity Steps for graphical construction of displacement diagram of constant velocity Constant velocity of the follower implies that the displacement of the follower is proportional to the cam displacement and slope of the … Uniform velocity, ii. Draw the profile of a cam to raise a valve with S.H.M. a. 5 Which of the following statements is/are true for cam profile? 1. Displacement diagrams are basic requirements for the construction of cam profiles. Displacement, Velocity and Acceleration Diagrams when the Follower Moves with Uniform Velocity Cam**:** The cam is the driver. 10. 19. Due to infinite accelerations, high inertia forces will be created at the start and at the end even at moderate speeds. Draw the profile of the cam. Uniform acceleration and retardation. Determine the maximum velocity and acceleration of the follower when the cam shaft rotates at 900 rpm. Uniform Acceleration and Retardation … Construct displacement diagrams for given cam profiles. The angle of ascent, the angle of dwell (between ascent and descent) and the angle of descent is 120°, 60° and 90° respectively. The cam profile will be discontinuous. Cam Follower Design Terminologies. Simple harmonic motion, iii. The follower may be placed at any angle that reciprocates on a line which passes through the centre of the cam shaft. Cams with Specified Contours. Uniform velocity, Simple harmonic motion, Uniform acceleration and retardation, and . 4. The valve must remain in the fully open position for 20^{\circ} of cam rotation. (Q-6) [5] Q2) Draw the displacement, velocity and acceleration diagrams for a follower when it moves with uniform acceleration and retardation. Uniform velocity, 2. Pitch point on … The path of UAR is parabolic and can be drawn using the rectangle method. Derive the expression for velocity and acceleration during outstroke Design a cam for operating the exhaust valve of an oil engine. Circular Arc Cam with Flat-faced Follower. … The cam profile will be tangential to these roller circles. The displacement of the follower is to take place with uniform acceleration and uniform retardation. 21. Follower**:** 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. From the displacement diagram, velocity and acceleration of the follower can also be plotted for different angular displacements θ of the cam. Uniform acceleration and retardation 4. 1: draw the profile of disc cam to given uniform velocity motion to the knife edged follower during outstroke of 60mm during 1st half revolution. Name four profiles normally used in cams. Draw the profile of the cam when line of stroke of the follower passes through the centre of the cam shaft. B. (iii) Follower will return to its initial position during 120 of cam rotation with uniform acceleration and retardation. D. Because the uniform velocity motion is a partial parabolic motion. Uniform Velocity Motion The displacement, velocity and acceleration diagrams when a knife-edged follower We shall now discuss the displacement, velocity and acceleration diagrams for the cam when the follower moves with the above mentioned motions. Draw the profile of the cam. the displacement of follower is to take place with uniform acceleration and uniform retardation. Draw the profile of the cam (i) when the line of stroke of the follower passes through the centre of the cam shaft, and (ii) when the line of stroke of the follower is off-set by 15 mm. fig.6.9 (c) Follower motion with uniform acceleration and retardation (UARM): Here, the displacement of the follower varies parabolically with respect to angular displacement of cam. follower displacement. We shall now discuss the displacement, velocity and acceleration diagrams for the cam when the follower moves with the above mentioned motions. Uniform Acceleration and Retardation (Parabolic) In such a follower programme, there is acceleration in the first half of the follower motion whereas it … 1500 00 to 1200 uniform acceleration and retardation rise of 36 mm, 1200 to 1800 uniform velocity rise of 12 mm, 1800 to 2400 dwell, 2400 to 3600 simple harmonic motion fall of 48 mm. Construct cam profiles and displacement diagrams. D All of the above. Derivatives of Follower motion: Velocity and acceleration of the followers for various types of motions. Uniform acceleration and retardation cams are used to controls the motion of linkages in complex machinery. C SHM follower motion. 1- Displacement, Velocity and Acceleration Diagrams when the Follower Moves with Uniform Velocity:- SHM, Uniform velocity, Uniform acceleration and retardation and Cycloidal motions Knife-edge, Roller, Flat-faced and Mushroom followers. Cycloidal motion. 20.6 Displacement, Velocity & Acceleration Diagrams when Follower Moves with Uniform Velocity 12/3/2013 Cycloidal motion. The motion curve and velocity and acceleration curves are as shown. uniform acceleration & retardation Prob. 11. infinite as in the uniform velocity type of motion. is required to move an offset roller follower with a uniform and equal acceleration and retardation on both the outward and return strokes. The lift of the valve is 37.5 mm and the least radius of the cam is 40 mm. stroke with Uniform acceleration and retardation,for 90° cam rotation; dwell for the remaining period. the cam shaft and follower detail the complete displacement graph the complete cam profile. 1. 1. DisplacementDiagram: Cam profile: Cam profile with 5 … Displacement, Velocity and Acceleration Diagrams when the Follower Moves with Cycloidal Motion. It is required to give equal uniform acceleration and retardation during opening and closing of the valve each of which corresponds to 60^{\circ} of cam rotation. 20.1. View Answer ... 16 For S.H.M. Construct standard cycloids. (b) Follower to dwell for 50° of cam rotation. (iv) Follower will dwell for remaining 60o of cam rotation. It is normally connected with a prime mover, which rotates it. The displacement, velocity and acceleration patterns are shown in fig.6.9. Cycloidal motion 12/3/2013 Dr. Mohammad Suliman Abuhiba, PE 20 . Note that the acceleration is zero for the entire motion (a=0) but is infinite at the ends. A In case of roller follower, trace ... B Uniform acceleration and retardation of follower motion. 11. Which of the following statements is/are true for cam profile? The valve remains closed during the rest of the revolution.
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