The following particulars relate to a symmetrical circular cam operating a flat-faced follower : Least radius = 25 mm ; nose radius 120°, cam shaft speed = 1000 r.p.m. 8 mm, lift of the valve = 10 mm, angle of action of cam = %3D %3D Determine the flank radius and the maximum velocity, acceleration and retardation of the follower. If the mass of the follower and valve with which it is in contact is 4 kg, find the minimum force to be exerted by the spring to overcome inertia of the valve parts. [Ans. 88 mm ; 1.93 m/s, 690.6 m/s, 296 m/s ; 1184 N]

The following particulars relate to a symmetrical circular cam operating a flat-faced follower : Least radius = 25 mm ; nose radius 120°, cam shaft speed = 1000 r.p.m. 8 mm, lift of the valve = 10 mm, angle of action of cam = %3D %3D Determine the flank radius and the maximum velocity, acceleration and retardation of the follower. If the mass of the follower and valve with which it is in contact is 4 kg, find the minimum force to be exerted by the spring to overcome inertia of the valve parts. [Ans. 88 mm ; 1.93 m/s, 690.6 m/s, 296 m/s ; 1184 N]

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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The following particulars relate to a symmetrical circular cam operating a flat-faced follower : Least radius = 25 mm ; nose radius 120°, cam shaft speed = 1000 r.p.m. = 8 mm, lift of the valve = 10 mm, angle of action of cam = %3D Determine the flank radius and the maximum velocity, acceleration and retardation of the follower. If the mass of the follower and valve with which it is in contact is 4 kg, find the minimum force to be exerted by the spring to overcome inertia of the valve parts. [Ans. 88 mm ; 1.93 m/s, 690.6 m/s², 296 m/s² ; 1184 N]
For a cam follower at a constant angular velocity of wcam = 8550 rpm, downward acceleration of af = 111,000 ft/s², total follower weight of 1 lb, pressure angle of 20°, where the direction of the total force to the cam center is perpendicular at d = 0.75 inch. Determine the torque required to drive the cam. 2. Spring A,(111,000 ft/s2) in. diameter n.= 8550 rpm in. 45° in.
6.7 A plate cam with a reciprocating follower is to rotate clockwise at 400 rev/min. The follower is to dwell for 60° of cam rotation, after which it is to rise to a lift of 2.5". During 1" of the return motion, it must have constant velocity of -40 in/s. Recommend standard cam motion from Sec. 6.7 to be used for high-speed operation, and determine the corresponding lifts, and cam rotation angles for each segment of the cam.
A cam, with a minimum radius of 30 mm, rotating clockwise at a uniform speed is to be designed to give a roller follower, at the end of a valve rod, motion described below : To raise the valve through 60 mm during 150° rotation of the cam;To keep the valve fully raised through next 30° (Dwell);To lower the valve during next 90°; and To keep the valve closed during rest of the revolution i.e. 90° (Dwell); The diameter of the roller is 20 mm and the diameter of the cam shaft is 30 mm. Draw the displacement, the velocity and the acceleration diagrams for one complete revolution of the cam when the cam shaft rotates at 180 r.p.m. Draw the cam profile when the line of the stroke is offset 20 mm from the axis of the cam shaft. The displacement of the valve, while being raised is to take place with simple harmonic motion and lowered with uniform acceleration.
A cam has the following characteristics: (a) It starts from dwell and ends in another dwell (b) In section I the cam has a parabolic profile: Y = Ay² + By + C (c) In section I from 0 < y < 1/2 the cam rises to the height of ½ (d) In section Il the cam has a cubic profile: Y = Dy³ + Ey² + Fy + G (e) In section IIl from 1/2
18. The following particulars relate to a symmetrical circular cam operating a flat-faced follower: Least radius = 25 mm ; nose radius = 8 mm, lift of the valve = 10 mm, angle of action of cam = 120°, cam shaft speed 1000 r.p.m. Determine the flank radius and the maximum velocity, acceleration and retardation of the follower. If the mass of the follower and valve with which it is in contact is 4 kg, find the minimum force to be exerted by the spring to overcome inertia of the valve parts. [Ans. 88 mm ; 1.93 m/s, 690.6 m/s², 296 m/s² ; 1184 N]
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