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- (b)Find the torque required to raise the load of 15kN and mean diameter of triple threaded screw being 46mm. Also gIven pitch = 8mm and coefficient of friction is 0.15?Design the power screw for the jack that can lift maximum 1000 kg of load.A soft surface cone clutch must handle 1865 In-1b of torque at 1250 rpm. The large diameter of the clu is 13.75 in. and the included angle in 12.5°. The face width of the bearing surfaces is 2.5 in. Using efficient of friction 0.20. determine (a) the force (F) to engage the clutch, (b) the required normal unit pa sure on the contact surfaces when operation is at capacity Ans. 428 lb. 13.15 psi
- Determine diameter of hand-wheel or length of handle, assuming that maximum force exerted by a man is 150 lbf. The bolt is 1" OD, 0.9" ID. Coefficient of friction is .15 You need to push down with a force of 6000lbf. This is for a handle of a screw press. Please explain the equation and I will upvotethe radius of each pulley is 5 inches and the coeffiecent of friction is 0.3 a) determine the largest torque that can be transmitted if the allowable belt tension is 1000 lbs? b) what would be the largest torque if the belt is a v-belt with a groove angle of 75 degrees? c) which style belt transmits the highest torque a flat belt or a v belt?A roller chain is to transmit 5 hp from a gearmotor to a wood-working machine, with moderate shock. The 1-in output shaft of the gearmotor turns n = 500 rpm. The 1 ¼-in. driven shaft turns 250 rpm; C »16 in. (a) Determine the size of sprockets and pitch ofchain that may be used. If a catalog is available, be sure maximum bore of sprocket is enough to fit the shafts. (b) Compute the center distance and length of chain. (c) What method should be used to supply oil to the chain?
- A leafs spring contains 4 full-length and 8 graduated leafs. The eyebolts at the support are 20 inches apart and the system should carry a load of 400 lbs. If the thickness of the available bronze plate is 1“ and Sy = 80 ksi, what leaf width is required at FOS = 8?1. A jack having square threads of 50 mm nominal diameter and 10 mm pitch is supporting a load of 89 kN. A double thread is used and the coefficient of friction maybe as low as 0.10 or as high as 0.15.a. Will this screw always self-locking?b. What is the highest torque necessary to raise the load?A local utility vehicle production company have considered using in one of its design a multi-disc clutch consisting of a 9 steel disc and 8-bronze discs with effective outside and inside diameter of 220mm and 160mm, respectively. If the shaft turns at 150rpm and an axial force of 600N is applied, find the horsepower capacity, considering a coefficient of friction of 0.25
- to calculate the radial force acting upon the clutch face, shouldnt the force of 1 shoes be calculated, multiplied by 4 then subtracted the spring stiffness which is also multiplied by 4?A single plate friction clutch with both sides of plate being effective is used to transmit power at an engine speed of 200rpm. It has outer and inner radii 10cm and 8cm respectively. Find maximum power transmitted and the corresponding axial thrust, if the maximum intensity of pressure is not to exceed 0.08N/mm2 . Assume coefficient of friction as 0.25.Design of the Screw Jack. Lifting load – W, kN is 70. Hight of lifting– H, mm is 500 Types of threads is Square Material of nut is Cast iron