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)?
1
The clutch of a motor car is required to transmit 9 kW at 3500 rpm. It is of single-plate type, with both sides of the plate being effective. The coefficient of friction is 0.25 and the maximum pressure is limited to 82 N/cm2. The ratio of diameters is 1.4. Assuming uniform wear determine: (You should upload the answers in the Link provided for submitting the assignment, typing the answers in the box provided below is optional). The internal diameter of the plate in mm The external diameter of the plate in mm
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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 5/16 inches thick and 10 inches wide is used. The diameters of the motor pulley and the driven pulley are 14 inches and 54 inches, respectively. The center distance is 54 inches and both pulleys are made of cast iron. Coefficient of friction of leather on cast iron is 0.35. The allowable stress of the belt is 350 psi and the belt weighs 0.035 lb/in^3. What is the horsepower capacity of the belt?
Hello could you please help with this question, i have attached it as an image, im not sure if the answers from the prevous question are needed, if so please let me know, thanks
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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
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