Q1:- The circular arc cam rotates uniformly at 600 rpm and operates aflat-footed reciprocating follower. The base circle radius= 24 mm,the nose circle radius= 3 mm, the center distance between thebase and nose circles = 30 mm and the distance between the pitchcircle center to the center of curvature of the circular flank= 120mm. The follower retaining spring is to be designed so that at thebeginning of the nose, the spring force is 10% greater than thevalue required to hold the follower on the cam, and in the full liftposition, the spring force is 5% greater than the required value.Find the spring stiffness and the spring force at the zero liftposition if the total mass o the reciprocating parts is 1.25 kg.

Given datar1=24mm (Base circle radius)r2=3mm(Nose circle radius)R =Flank circle radiusd-Distance…

Answered: Q1:- The circular arc cam rotates…

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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Q5:- A symmetrical cam with circular flank operates a flat-footed follower. The lift is 8 mm, base circle radius is 25 mm and the nose circle radius is 12 mm. If the total angle of cam action is 120°, find the maximum acceleration when the cam shaft rotates at 500 rpm.
(Q1) flat faced reciprocating follower has the following motion:a) The follower moves out for 80° of cam rotation with uniformacceleration and retardation, the acceleration being twice theretardation.b) The follower dwells for the next 80° of cam rotation.c) It moves in for the next 120° of cam rotation with uniformacceleration and retardation, the retardation being twice theacceleration.d) The follower dwells for the remaining period.The base circle diameter of the cam is 60 mm and the stroke of thefollower is 20 mm. The line of movement of the follower passes throughthe cam centre.Draw the displacement diagram and the profile of the cam very neatlyshowing all constructional details.
Q7:-A cam having a lift of 1 cm operates the suction valve of 4-stroke cycle petrol engine. The least radius of the cam is 2 cm and the nose circle radius is 0.25 cm. The crank angle of the engine, when suction valve opens is 4° after T.D.C. and it is 50° after B.D.C. when the suction valve closes. The valve is integral with the camshaft and operates as flat-faced follower. Estimate (a) the maximum velocity of the valve when the engine speed is 2000 rpm, (b) the maximum acceleration and retardation of the valve and (c) the maximum and minimum force to be exerted by the spring to overcome inertia of the valve parts which weigh 2 N.
A disc cam is to give uniform motion to a knife edge follower during out stroke of 50 mm during the first half of the cam revolution. The follower again returns to it's original position with uniform motion during the next half of the revolution. The minimum radius of the cam is 50 mm and the diameter of the cam shaft is 35 mm. 1.Draw the fully defined displacement diagram of the follower. 2.Draw the profile of the cam when the axis of the follower passes through the axis of the cam shaft.
The following data relate to a circular cam operating a flat-faced follower :Least diameter = 40 mm, Lift = 12 mm, Angle of action = 160°, Speed = 500 rpm. If the period of acceleration of the follower is 60° of the retardation during the lift, determine the main dimensions of the cam, the acceleration at main points. What is the maximum acceleration and deceleration during the lift?
machine theory A disc cam rotating in a clockwise direction is used to move a reciprocating roller with simple harmonic motion in a radial path, as given respectively: fi) Dwell for 60e of cam rotation, (ii) Outstroke with maximum displacementof 25 mm during 1200 of cam rotation, (iii) Dwell during 900 of cam rotation, and (iv) Return stroke With maximum displacementof 25 mm during 900 Of cam rotation. Draw the profile of the cam when the line of reciprocation of the follower is offset by 20 mm towards left from the cam shaft axis. The maximum radius of cam is 20 mm and the roller diameter is 8 mm
ONLY NEED PART B QUESTION c A) A follower for a cylindrical cam is required to travel with simple harmonic motion from datum zero to a maximum rise in 100° of cam rotation, dwell for 80° and return with simple harmonic motion to datum zero in the remaining 180° of cam rotation. Assuming your own values for the rise, base circle diameter and slot dimensions, draw a displacement diagram and suggest a layout for the cylindrical cam. B). a). A radial cam with a reciprocating follower is to be driven by a constant-speed motor at 150 rpm. The follower is to start from a dwell, accelerate to a uniform velocity of 25 in/s, maintain this velocity for 1.25 in of rise, decelerate to the top of the lift, return, and then dwell for 0.10 s. The total lift is to be 3.00 in. Determine the complete specifications of the displacement diagram. b). Assuming that the displacement characteristics in part A are to be achieved by a radial cam with a reciprocating flat-face follower, determine the minimum…
A cam, with a minimum radius of 25 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 : 1. To raise the valve through 50 mm during 120° rotation of the cam ; 2. To keep the valve fully raised through next 30°; 3. To lower the valve during next 120°; and 4. To keep the valve closed during rest of the revolution i.e. 90° ; The diameter of the roller is 20 mm and the diameter of the cam shaft is 25 mm. Draw the profile of the cam when (a) the line of stroke of the valve rod passes through the axis of the cam shaft, and (b) the line of the stroke is offset 15 mm from the axis of the cam shaft. The displacement of the valve, while being raised and lowered, is to take place with simple harmonic motion. Determine the maximum acceleration of the valve rod when the cam shaft rotates at 100 r.p.m. Draw the displacement, the velocity and the acceleration diagrams for one complete revolution of the cam.
Q6:- Particulars of a symmetric tangent cam operating a roller follower in a 4-stroke engine are as follows:- (a) basic circle radius=3 cm, (b) roller radius=1.5 cm, (c) angle of ascent=75°, (d) total lift=1.5 cm and (e) the engine speed=1200 rpm. Calculate:- (a) the principal dimensions, (b) maximum velocity and (c) maximum acceleration and deceleration.
A disc cam rotating in a clockwise direction is used to move a reciprocating roller with simple harmonic motion in a radial path, as given below: (1) Outstroke with maximum displacement of 25 mm during 120° of cam rotation, (ii) Dwell for 60° of cam rotation, (iii) Return stroke with maximum displacement of 25 mm during 90° of cam rotation, and (iv) Dwell during remaining 90° of cam rotation. The line of reciprocation of follower passes through the camshaft axis. The maximum radius of cam is 20 mm. If the roller diameter is 8 mm. Draw the profile of the cam when the line of reciprocation of the follower is offset by 20 mm towards right from the cam shaft axis.
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.
Draw a Cam with uniform motion of follower based on the following data. 45 mm minimum diameter of Cam, 50 mm lift (rise) with uniform velocity, 0º to 90º Rise, 90º to 180º Top dwell, 180º to 270º Fall, 270º to 360º bottom dwell, clockwise rotation. The diameter of Cam Shaft hole is 25mm.

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