In a cam-follower mechanism, the follower needs to rise through 20 mm during 60° of cam rotation, the first 30° with a constant acceleration and then with a deceleration of the same magnitude. The initial and final speeds of the follower are zero. The iniform of 300 rnm

In a cam-follower mechanism, the follower needs to rise through 20 mm during 60° of cam rotation, the first 30° with a constant acceleration and then with a deceleration of the same magnitude. The initial and final speeds of the follower are zero. The iniform of 300 rnm

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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A cam drives a flat reciprocating follower in the following manner. During the first 90° rotation of the cam, the follower moves outward through a distance of 30 mm with SHM. The follower dwells during next 90° cam rotation. During the next 90° cam rotation, the follower moves inward with SHM. The follower then dwells next 90° cam rotation. Draw the cam profile and calculate the maximum values of velocity and acceleration when cam rotates at 10 rad/s.
A cam is used to operate a platform that repeatedly lifts boxes for a height of 40 mm as shown. One cycle of the cam has the following motion requirements: Rise to 40 mm in 1.5 s, Dwell for 0.25 s, Fall for 20 mm in 1 s; Dwell for 0.25 s; Fall a further 20 mm in 1s and the cycle repeats after this. The required speed of cam is rpm and the angle turned by cam during the Rise motion is degrees. *Write your answer only as numbers, DO NOT add any text 40 mm
A cam rotating clockwise with a uniform speed is to give the roller follower of 20 mm diameter with the following motion : 5. (a) Follower to move outwards through a distance of 30 mm during 120° of cam rotation; (b) Follower to dwell for 60° of cam rotation ; (c) Follower to return to its initial position during 90° of cam rotation ; and (d) Follower to dwell for the remaining 90° of cam rotation. The minimum radius of the cam is 45 mm and the line of stroke of the follower is offset 15 mm from the axis of the cam and the displacement of the follower is to take place with simple harmonic motion on both the outward and return strokes. Draw the cam profile.
A cam drives a radial, knife-edged follower through a 41 mm rise in 84° of cycloidal motion. If the cam is rotating at 232 rpm, determine the velocity (mm/s) at 27°. Use 3 decimal places in your calculations. Displacement dingram and derivatives for full-rise cycloidal motion, y The displacement cquation and the first-, second-, and third-order kincmatic cocffi ients for full-rise cycloidal motion are 1 270 y=L sin y =D(1- 2x0 1-COS B. 27L sin B2 2x0 y!" %3D 47x2L 2n0 Cos Answer: PType here to search
A cam drive is used for a mechanism incorporated in a shoe-sewing machine. The cam follower must rise outward 0.5 in. with cycloidal motion in 0.7 s, dwell for 0.2 s, fall 0.25 in. with cycloidal motion in 0.5 s, dwell for 0.2 s, fall 0.25 in. with cycloidal motion in 0.5 s and then repeat the sequence. Determine the required speed of the cam and graphically plot a follower displacement diagram.
A tangent cam with straight working faces tangential to a base circle of 120 mm diameter has a roller follower of 48 mm diameter. The line of stroke of the roller follower passes through the axis of the cam. The nose circle radius of the cam is 12 mm and the angle between the tangential faces of the cam 90°. If the speed of the cam is 180 rpm, determine the acceleration of the follower, when i) during the lift, the roller just leaves the straight flank.
A radial disc cam operates a follower in a straight line. The stroke of the follower is 30 mm and is completed in 0.02 second from rest to rest. The motion is made up of uniform acceleration for ¼ of time, uniform velocity for ½ of the time followed by uniform retardation. Find the maximum velocity reached and the value of acceleration and retardation.
A cam returns from its maximum height L = 1,661 units, whose return lasts B = 68 °, which consists of the sum of the angular displacements B1 and B2. The first part of the returm, L1 = 0.298 units, is carried out with cycloidal movement and the rest with simple harmonic movement. L1 L 0° B1 B2 a) Sketch the diagrams, and determine the length of the return, L2, in the second movement, in units of length. b) Determine the angular displacement B1, in degrees. c) Calculate the angular displacement B2, in degrees. d) Determine the magnitude of the maximum velocity of the cam, in u / rad. e) Determine the magnitude of the maximum acceleration of the cam, in u/ rad2.
A shaft rotating with 19 rev/s is uniformly accelerated at 0.4 rad/s? for 6 seconds. It then rotates with a uniform speed for next 9 s. Then it is made to stop in next 15 s. Determine (i)maximum angular velocity; (ii) total angular displacement Solution: The maximum velocty in rad/s is The total displacement in rad is
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A cam is to give the following motion to a roller follower with radius (5 mm): 1. Outstroke during 60° of cam rotation; 2. Dwell for the next 30° of cam rotation: 3. Return stroke during next 60° of cam rotation, and 4. Dwell for the remaining 210° of cam rotation. The stroke of the follower is 40 mm and the minimum radius of the cam is 50 mm. the follower moves with uniform velocity during both the outstroke and return strokes. Draw the profile of the cam when the axis of the follower passes through the axis of the cam shaft.
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