Answered: 21/ Draw the profile of a cam operating…

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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Transcribed Image Text:Cams (Home works) Q1/ Draw the profile of a cam operating a knife-edge follower (when the axis of the follower passes through the axis of cam shaft) from the following data: (a) follower to move outward through 30 mm with simple harmonic motion during 120° of cam rotation, (b) Follower to dwell for the next 60°,e d (c) Follower to return to its original position with uniform velocity during 90° of cam rotation, (d) Follower to dwell for the rest of the cam rotation. The least radius of the cam is 20 mm and the cam rotates at 240 rpm. Determine the maximum velocity and acceleration of the follower during outstroke and return stroke. Q2/ If in Q1, the axis of the follower is not passing through the axis of the cam shaft but is offset by 10 mm from the axis of the cam shaft, then draw the profile of the cam. All other data remains the same. Q3/ A cam rotating with a uniform speed are to give the roller follower of 20 mm diameter the following motion: (a) Follower to move outwards through a distance of 30 mm during 120° of cam rotation, (b) Follower to dwell for the next 60°, Gdd (c) Follower to return to its original position during 90° of cam rotation, (d) Follower to dwell for the remaining 90° of cam rotation. The minimum radius of 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 stroke. Draw the cam profile. Q4/ If in Q3, the roller follower is to take place with uniform acceleration and retardation on both the outward and return stroke. Draw the cam profile in that case. All other data remains the same. Q5/ Draw the outward cam profile for a cam operating a knife-edge follower when the axis of the follower passes through the axis of camshaft, from the following data: (a) Follower to move outward through 30 mm with uniform acceleration and uniform retardation during 150° of cam rotation, (b) Follower to dwell for the next 30°, (c) Follower to return to its original position with simple harmonic motion during 90° of cam rotation, (d) Follower to dwell for the rest of the cam rotation. The least radius of cam is 50 mm. Q6/ Draw the displacement diagram of a cam operating a knife-edge follower when the axis of the follower passes through the axis of cam shaft from the following data: (a) Follower to move outwards through 50 mm during 160° of cam rotation, (b) Follower dwell for the next 30°, (c) Follower to return to its original position during next 120°. (d) Follower to dwell for the rest of the cam rotation. The displacement of the follower is to take place with uniform acceleration motion during the outward strokes and with simple harmonic motion during the return strokes. (Note: Use 8 divisions). 10-10

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