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- A constant torque electric motor is used to drive the punching press. The pressis provided with a flywheel that rotates at maximum speed of 125 r.p.m. Theradius of gyration of the flywheel is 0.6 m. The press punches 200 holes perhour, each punching operation takes 1.5 second and requires 16 kNm ofenergy. Calculate the power of the motor and the minimum mass of theflywheel, if its speed is not to fall below 100 r. p. mA belt conveyor transports 18 tonnes per hr at 20°. Determine the unit weight of belt material in kg/ply-cm width-m to lift the load vertically up sufficient to give 33.5 m horizontal center-to-center pulley distance. 1750-rpm motor, V-belt drive to helical gear speed reducer. Belt speed, 61 m/min. Discharge over tail pulley. No tripper.thick lnange be! The total torque required to turn the double threaded power screw is 55 N.m. If the screw turns at 285 rpm and the pitch of 4mm, find: A. The horsepower input of the power screw. B. The efficiency if the weight loaded is 10 kN.
- Determine the following : (a) Tension in each cable when at the bottom (b) the minimum angular velocity in rpm to sustain themotion (refer to the image below)8. If the inertia is 80 lb-ft2, and the speed of the driven shaft is to be increased from 0 to 1500 rpm in 3 seconds. Calculate the heat generated for each engagement if clutch starting torque is 10 in-lb.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.
- In a thrust bearing the external and the intermal diameters of the contacting surfaces are 320 mm and 200 mm respectively. The totail axial load is 80 kN and the intensity of pressure is 350 kN/m. The shaft rotates at 400 rpm. Taking the coefficient of friction as 0.06, calculate the power lost in overcoming the friction, Also, find the mumber of collars required for the bearingAn overhang shaft carry a 900mm diameter pulley, whose center is 250mm from the center of nearest bearing. The weight of the pulley is 600N and the angle of lap is 180°.The pulley is driven by motor horizontally to right it, if the permissible tension in the belt is 2650N and the coefficient of friction between the belt and the pulley surface is 0.3, estimate the diameter of the shaft. Note, Neglect centrifugal tension and assume permissible tensile and shear stresses in the shaft as 84MPA and 68MPa respectively.The equation of the turning moment diagram for the three crank engine is given by:where θ radians is the crank angle from inner dead cen?tre. The moment of inertia of the flywheel is 400 kg-m2 and the mean engine speed is 300 r.p.m. Calculate the power of the engine and the total percentage fluctuation of speed of the flywheel, if 1. The resisting torque is constant, and 2. The resisting torque is (25 000 + 3600 sin θ ) N-m.
- Based on the standard requirement of a system, it is given that the diameter of the bore ofcylinders for clamping and drilling processes are 100 mm and 80 mm, respectively. It isexpected that the clamping process will take a load of 700N while 650N will be loaded fordrilling process. The speed movement for the clamping and drilling process is designed to be120cm/min and 180mm/min, respectively.i. Compute the required flowrate for the pump for both clamping and drillingprocesses. ii. Calculate the working pressure required for the system if only one cylinder is tobe choose for both clamping and drilling processes. iii. Which horse power of the motor is required?A three cylinder radial engine driven by a common crank has the cylinders spaced at120°. The stroke is 138 mm, length of the connecting rod is 252 mm andthe mass of the reciprocating parts per cylinder is 2.2 kg. Calculate the primary and thesecondary forces at crank shaft speed of 1500 rpm.Two masses A and B are 5kg and 2kg respectively rotating in a shaft. The corresponding radii of rotation are 0.2m and 0.3m respectively and the angle between the masses is 600. Find the position and magnitude of the balance mass required, if its radius of rotation is 200 mm using graphical method and also verify your answer with analytical method.