A polyamide A-3 flat belt 6 in wide is used to transmit 15 hp under light shock con- ditions where K, = 1.25, and a factor of safety equal to or greater than 1.1 is appro- priate. The pulley rotational axes are parallel and in the horizontal plane. The shafts are 8 ft apart. The 6-in driving pulley rotates at 1750 rev/min in such a way that the loose side is on top. The driven pulley is 18 in in diameter. See Fig. 17–10. The fac- tor of safety is for unquantifiable exigencies. (a) Estimate the centrifugal tension F and the torque T. (b) Estimate the allowable F1, F2, F; and allowable power Ha. (c) Estimate the factor of safety. Is it satisfactory? 1750 rpm Belt 6 in x 0.130 in 15 hp 18 in 6 in Ibf y= 0.042 in -96 in

A polyamide A-3 flat belt 6 in wide is used to transmit 15 hp under light shock con- ditions where K, = 1.25, and a factor of safety equal to or greater than 1.1 is appro- priate. The pulley rotational axes are parallel and in the horizontal plane. The shafts are 8 ft apart. The 6-in driving pulley rotates at 1750 rev/min in such a way that the loose side is on top. The driven pulley is 18 in in diameter. See Fig. 17–10. The fac- tor of safety is for unquantifiable exigencies. (a) Estimate the centrifugal tension F and the torque T. (b) Estimate the allowable F1, F2, F; and allowable power Ha. (c) Estimate the factor of safety. Is it satisfactory? 1750 rpm Belt 6 in x 0.130 in 15 hp 18 in 6 in Ibf y= 0.042 in -96 in

International Edition---engineering Mechanics: Statics, 4th Edition

4th Edition

ISBN:9781305501607

Author:Andrew Pytel And Jaan Kiusalaas

Publisher:Andrew Pytel And Jaan Kiusalaas

Chapter7: Dry Friction

Section: Chapter Questions

Problem 7.70P: Solve Sample Problem 7.16 if the contact pressure under the polisher varies parabolically from p0 at...

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A polyamide A-3 flat belt 6 in wide is used to transmit 15 hp under light shock conditions where Ks= 1.25, and a factor of safety equal to or greater than 1.1 is appropriate. The pulley rotational axesare parallel and in the horizontal plane. The shafts are 8 ft apart. The 6-in driving pulley rotates at1750 rev/min in such a way that the loose side is on top. The driven pulley is 18 in in diameter. Thecoefficient of friction is 0.8. Analyze the centrifugal tension Fc and the torque T.?
A cone clutch with a cone semi-angle of 120 is to transmit 11.19KW at 750rpm. The width of the face is 1/4th of the mean diameter and the normal pressure between the contact faces is not to exceed 8.27 X 104 Pa allowing the co efficient of friction of 0.2, Determine the main dimensions of the clutch and the axial force required.
A cone clutch is to transmit 7.5 kW at 900 rpm. The cone has a face angle of 12o. The width of the face ishalf of the mean radius and the normal pressure between the contact faces is not exceeding0.09Nmm2⁄. Assuming uniform wear and the coefficient friction between contact faces as 0.2. Find themain dimensions of the clutch and the axial force required to engage the clutch.
A conical clutch has an included angle of 120°, a coefficient of friction of 0.4, and outer and inner diameters of 85mm and 18mm respectively. Using both the uniform wear theory and the uniform pressure theory, calculate the force required to press the two halves together if it is to transmit 300W at 750rev/min. The uniform wear theory and the uniform pressure theory deliver different values for torque in the same system. Which theory would be preferred in practice for use in calculations involving a friction clutch? Give reasons for your choice.
A polyamide F-0 flat belt 80mm wide is used to transmit 5 kW under light shock conditions where Ks = 1.25, and a factor of safety equal to or greater than 1.1 is appropriate. The pulley rotational axes are parallel and in the horizontal plane. The shafts are 8mm apart. The 50 mm driving pulley rotates at 1750 rev/min in such a way that the loose side is on top. The driven pulley is 50 mm in diameter. The factor of safety is for unquantifiable exigencies. (a) Estimate the centrifugal tension Fc and the torque T. (b) Estimate the allowable F1, F2, Fi and allowable power Ha . (c) Estimate the factor of safety. Is it satisfactory?
. A square shaft of annealed AISI C1137 transmits a torsional moment of 1200 in-lb.What should be its size for medium shock?
A connecting rod for an I.C. engine running at 1800 r.p.m. and developing a maximum pressure of 3.15 MPa. The diameter of the piston is 100 mm; mass of the reciprocating parts per cylinder 2.25 kg; length of connecting rod 380 mm; stroke of piston 190 mm and compression ratio 6:1. Take a factor of safety of 6 for the design. Take length to diameter ratio for big end bearing as 1.3 and small end bearing as 2 and the corresponding bearing pressures as 10 MPa and 15 MPa. The density of material of the rod may be taken as 8000 kg/m³ and the allowable stress in the bolts as 60 MPa and in cap as 80 MPa. The rod is to be of I-section for which you can choose your own proportions. Calculate the dimension of I- section of the connecting rod.
Determine the axial spring force necessary to engage the clutch, when an engine developing 30kW at 500 r.p.m. is fitted with a cone clutch built inside the flywheel. The cone has a face angle of 13.5o and a maximum mean diameter of 300 mm. The coefficient of friction is 0.25. The normal pressure on the clutch face is not to exceed 0.1 N/mm2
A double-drum winder is used as a stage hoist for the sinking of a vertical shift. The stage is suspended in the vertical shaft by two winding ropes in double purchase, the fixed ends being anchored in the headgear. Each rope has a strength of 890 kN when new, and a mass of 5.38 kg/m. The empty stage has a mass of 18360 kg. The minimum factor of safety permitted for ropes is 5 at discard, but allowance must be made for 5% deterioration before discard. The shaft is being sunk to a depth of 1830 m below the headgear sheaves. Calculate the maximum mass load that can be placed on stage, including persons and material.
Determine the principal dimensions of a cone clutch faced with leather to transmit 55 kW at 1100 r.p.m. from an electric motor to an air compressor. Sketch a sectional front view of the clutch and provide the main dimensions on the sketch. Assume : semi-angle of the cone = 15; μ = 0.2; mean diameter of cone = 6 to 10 d where d is the diameter of shaft; allowable normal pressure for leather and cast iron = 0.075 to 0.1 N/mm2; load factor = 1.75 and mean diameter to face width ratio = 6.
Two pulleys, one 650 mm diameter and the other 400 mm diameter, on parallel shafts 1.5 m apart are connected by a flat belt. Find the length of the belt required and the angle of contact between the belt and each pulley. What power can be transmitted by the belt when the larger pulley rotates at 1200 rev/min, if the maximum permissible tension in the belt is 10 kN, and the coefficient of friction between the belt and pulley is 0.05? dont write handwritten solution.
Two pulleys, one 650 mm diameter and the other 400 mm diameter, on parallel shafts 1.5 m apart are connected by a flat belt. Find the length of the belt required and the angle of contact between the belt and each pulley. What power can be transmitted by the belt when the larger pulley rotates at 1200 rev/min, if the maximum permissible tension in the belt is 10 kN, and the coefficient of friction between the belt and pulley is 0.05? give proper explaination and dont give handwritten solution.