раper feed for a 12 The photocopier is controlled by two rollers together with approximately 20N. The rollers each consist of a 20 mm outer which are sprung force of a Steel shaft diameter plastic cylinder Plastic cylinder pressed onto a 10 mm diameter steel shaft (see Figure 9.30). The maximum feed rate for the Figure 6.30 Copier rollers. copier is 30 pages per minute. Select bearings to support the rollers.
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- Two shafts, one solid the other one hollow, are connected end to end by meansof a coupling in which there are 8 screws on the pitch diameter D = 250 mm.The solid shaft has diameter d = 50 mm and transfers the power P = 500 kW at 75 rev/s.The external diameter of the hollow shaft is dex = 75 mm.Note: All parts of the system must be equally strong, and able to transfer the requiredpowerCalculate:(a) The internal diameter di of the hollow shaft(b) The diameter of the bolts db connecting the two shafts(c) If the hollow shaft has to be replaced by a rectangular hollow cross-section withouter dimensions b x h and uniform wall thickness of 4 mm.Calculate the values b, h while following the request to keep h = 2bpower (N)=9.9kw Input speed (n1)=2350rpm Distance between centers (a)=168mm Total distance between Ave B bearings=440mm module(m)=3mm question 3 Calculate the power on the output shaft since there is 3% loss in gears in gearboxes, rolling bearings in support bearings (2% loss in a pair of bearings) and sealing element spring seal (4% loss in a pair of sealing elements).The turning moment diagram for a multi cylinder engine has been drawn toa scale of 1 mm = 4500 N -m vertically and 1 mm = 2. 4 ͦ horizontally. Theintercepted areas between output torque curve and mean resistance lineabove and below the mean taken in order from one end are 342, 23, 245,303, 115, 232, 227, 164 ??2, when the engine is running at 150 rpm. Ifthe mass of the flywheel is 1000 kg and the total fluctuation of speed doesnot exceed 3% of the mean speed, find the minimum value of the radius ofgyration.
- Find the greatest and smallest values of the velocity ratio of two shafts joined with a universal coupling when the axes are at 60o to each other. Produce a graph of velocity ratio against angle for ? to proof the calculated results.A 5 hp motor with a speed of 900 rpm is used to drive an industrial fan with a velocity of 5.72m/s. The center distance between the sprockets is 1.5 times the diameter of driven sprocket andis equal to 630 mm. Determine the length of chain in pitches. Use RC 40 chain and service factorof 1.3.Please draw the figure. Thank you so much.An engine flywheel and a clutch plate are both connected to a transmission shaft. Let the moment of inertia of the flywheel be I1 and its angular velocity ω1, and let the moment of inertia of the clutch plate be I2 and its angular velocity is ω2. The two discs have then been combined by forces which are applied at their axes of rotation so as not to cause any torque. The discs then reached a common final angular velocity after rotational collision. Find the expression for the final angular velocity.
- A multi-cylinder engine is to run at a speed of 600 r.p.m. On drawing the crank-effort diagram to scale of 1 cm 2452.5 N-m and I cm 30°, the areas above and below the mean torque line in sq.cm. are as follows: +1.6, -1.72, +1.68, -1.91, +1.97 and -1.62. The speed is to be kept within ±1% of the mean speed of the engine. Calculate the necessary moment of inertia of the flywheel. Determine the suitable dimensions of a rectangular flywheel rim, if the breadth is twice the thickness. The density of the cost- iron is 725 gm/cm' and its hoop stress is 588.6 N/cm2. Assume that the rim contributes 92% of the flywheel effect.A three-thread worm gear, rotating at 1000 rpm, drives a 31-tooth worm gear and transmit 15 HP. Theworm has 14 ½ o teeth with ¾ pitch, 2 in pitch diameter, and an included face angle of 60o. The coefficientof friction is 0.05. (Assume Y = 0.322) A. Determine the helix angle of the worm. Ans. 70.30o B. Determine the speed ratio. Ans. 10.33C. Determine the center distance. Ans. 4.70 inD. Determine the apparent stress in the worm wheel teeth. Ans. 31,100 psiE. Determine the efficiency of this worm-gear set. Ans. 85.70%Q3/ A vertical double acting steam engine develops 80 kW at 240 rpm. The maximum fluctuation of energy is 25% of the work done per stroke. The maximum and minimum speeds are not to vary more than +1% of the mean speed. Find the mass of the flywheel, if the radius of gyration is 0.65 m.
- The corediameter of the double start square threaded screw having a pitch of 12mm is 50 mm. A load of 18kN is lifted through a distance of 180mm. Find the work done(in Joule)in lifting the loadand the efficiency of the screw, when 1. The load rotates with the screw, and 2. The load rests on the loose head which does not rotate with the screw. The external and internal diameter of the bearing surface of the loose head are 60 mm and 10 mmrespectively. The coefficient of friction for the screw is 0.11,whilefor the bearing surface is 0.13.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 : To raise the valve through 50 mm during 120° rotation of the cam To keep the valve fully raised through next 30° To lower the valve during next 120°; and 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. The displacement of the valve, while being raised and lowered, is to take place with simple harmonic motion. b) Determine the maximum acceleration of the valve rod when the cam shaft rotates at 100 r.p.m.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 : To raise the valve through 50 mm during 120° rotation of the cam To keep the valve fully raised through next 30° To lower the valve during next 120°; and 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. The displacement of the valve, while being raised and lowered, is to take place with simple harmonic motion. c) Draw the displacement, the velocity and the acceleration diagrams for one complete revolution of the cam.