Q9: The pitch of 50 mm mean diameter threaded screw of a screw jack is 12.5 mm. The coefficientof friction between the screw and the nut is 0.18. Determine the torque required on the screwto raise a load of P kN, assuming the load to rotate with the screw. Determine the ratio of thetorque required to raise the load to the torque required to lower the load and also the efficiencyof the machine.|Where, P= 46KN

The lead angle (α) can be calculated using the formula:α = tan⁻¹(P/πD)where P is the pitch and D is…

Answered: Q9: The pitch of 50 mm mean diameter…

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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An automotive-type clutch, as shown in Figure 18.2, has inside and outside diameters of 160 and 240 mm, respectively. Clamping force is provided by nine springs,each compressed 5 mm to give a force of 900 N when the clutch is new. The moldedfriction material provides a conservatively estimated coefficient of friction of 0.40when in contact with the flywheel and pressure plate. Maximum engine torque is280 N # m.(a) What is the safety factor with respect to slippage of a brand new clutch?(b) What is the safety factor after “initial wear” has occurred?(c) How much wear of the friction material can take place before the clutch will slip (assuming no change in coefficient of friction)?
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A fan is driven by a belt from a motor which runs at 880 rpm. A medium double ply leather belt 8 mm thick and 250 mm wide is used. The diameters of the motor pulley and the driven pulley are 350 mm and 1370 mm. The center distance is 1370 mm, and both pulleys are made of cast iron. Coefficient of friction of leather on cast iron is 0.35. The allowable stress for the belt is 2.4 MPa, which allows for the factor of safety and also for the fact that a double ply belt does not have double the capacity of a single ply belt. (A double ply belt has approximately 85% the capacity of a single ply belt of the same thickness.) The belt density p =970 kg/m^3. What is the power capacity? (Answer: 39.1 kW ) -0350 -1370
A single square-thread screw has an input power of 3 kW at a speed of 1 rev/s. The screw has a diameter of 40 mm and a pitch of 8 mm. The frictional coefficients are 0.16 for the threads and 0.09 for the collar, with a collar friction diameter of 50 mm. Find the axial resisting load Fand the combined efficiency of the screw and collar if the screw is raising the load. The axial resisting load Fis |kN. The combined efficiency of the screw and collar is %.
DD=25
A single-threaded power screw of square form is to raise a load of 90KN at the rate of 360mm/min. Other data are as follows: Nominal Diameter of screw = 36mm Pitch = 6mm Coefficient of thread friction = 0.1 Coefficient of collar friction = 0.08 Friction radius at collar= 30mm Determine the power input to the screw in kilowatts.
4. The weight of each wheel of a motor driven traveling crane moving at 600fpm is 5800 Ibs. If the coefficient of rolling friction is 0.05, find the horsepower required to overcome friction. 5. Compute the force necessary to move a 6000 lbs supported on four wheels of 2.5 ft diameter, assuming the coefficient of rolling friction to be 0.007.
(Q2) A pump is driven by an electric motor using an open type flat belt. Determine the width and length of belt for the following data: Power transmission = 15kW Rotational speed of the motor=1,440 rpm Motor pulley diameter = 250 mm Pump pulley diameter = 500 mm Coefficient of friction for motor pulley = 0.26 Coefficient of friction for pump pulley 0.22 Center distance between the pulleys = 1,200 mm Thickness of the belt = 5 mm Density of belt material = 1,000 kg/m? Allowable stress for the belt material = 2 MPa
8. Design a clamp coupling for transmitting 25 kW at 300 rpm. Allowable shear stresses in shaft and key are 50 MPa and 45 MPa, respectively. The number of bolts joining the two halves of muff is 4. The permissible tensile stress in the bolt is 70 MPa and the permissible crushing stress in the key is 90 MPa. The coeffi cient of friction between the muff of the CI and the shaft of steel is 0.20.
(1) A single square thread power screw is to raise a load of 70kN. The screw has a major diameter of 36mm & a pitch of 6mm. The coefficient of friction of the thread & the collar are 0.13 & 0.1, respectively. If the collar mean diameter is 90mm & the screw turns 60rpm, find: (a) power input of the screw; (b) combined efficiency of the screw & collar.
Q8 A multi-disk clutch consists of two steel disks with one bronze disk. The inner and outer diameters ofthe contacting surfaces are 200 and 250 mm respectively. The coeffi cient of friction is 0.1 and themaximum pressure between the contacting surfaces is limited to 0.4 N/mm. Assuming uniform weartheory, calculate the required force to engage the clutch and the power transmitting capacity at 720rpm.

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