A vertical two start square threaded screw of a (100 mm) pitch diameter and (20 mm) pitch supports a vertical load of (18 kN). The axial thrust on the screw is taken by a collar bearing of (87.5 mm) mean radius. Find the force required at the end of a lever which is (400 mm) long in order to lift and lower the load. The coefficient of friction for the vertical screw and nut is (0.15) and that for collar bearing is (0.2). Also, find the overall efficiency for the two cases.

A vertical two start square threaded screw of a (100 mm) pitch diameter and (20 mm) pitch supports a vertical load of (18 kN). The axial thrust on the screw is taken by a collar bearing of (87.5 mm) mean radius. Find the force required at the end of a lever which is (400 mm) long in order to lift and lower the load. The coefficient of friction for the vertical screw and nut is (0.15) and that for collar bearing is (0.2). Also, find the overall efficiency for the two cases.

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

See similar textbooks

Similar questions

The band wrench of Fig. an oil filter from a car. (The filter acts as if it were a wheel with a resisting torque of 40 lb ft.) Determine the mini- mum coefficient of friction between the band and the filter that will prevent slippage. The weight of the handle can be neglected. is used to unscrew 40 Ib-ft 2.5 in. -2 in. 7.5 in.
A single square thread power screw has a lead of 7 mm and mean diameter of 35 mm. If it Is used to lift a load of 30 kN and coefficient of friction of thread is 0.18, find the torque required to turn the screw.
The roughly position of the automobile jack shown in the figure is a square screw with a single blade at both ends. ABC is controlled by a bolt (right-hand threaded in A, left-handed in C). square of the bolt screw has a pitch of 2.5 mm and an average diameter of 9 mm. between the bolt and the jack limbs The coefficient of static friction is 0.15, taking into account the position and load shown, you can use the jack Find the magnitude of the torque that must be applied to raise it.
The pressure distribution at the pivot bearing's surface of contact changes, as indicated. Determine the torque M necessary to overcome friction if the shaft sustains an axial force P and the coefficient of static friction is.
Hiw - Friction Q: The 300 Ib block shown in fig hae impanding motion Caused by the horiZontal foree of 700 Ib find the Coe of static friction befween the Contact Sur faces. up the plane fficrent 300 700Ib 4-lm
A 150 lb man stands on a 60 lb bar to which the cable is tied at B. The cable passes over two fixed pegs with coefficient of frictions as indicated. You may treat the cable the same as you would treat a flexible flat belt. assume the normal force exerted by the man in the bar acts downward through point A. Find the smallest force the man can exert on the cable if the bar is to remain horizontal.
The clamp exerts a 145 lb compressive force on the wood blocks. Single-threaded screw BC has lead L = 0.190 in. and mean diameter d = 0.370 in. It turns in the threaded sleeve at C and pushes against B. The coefficient of static friction between the screw threads and the threaded sleeve is = 0.300. Neglect friction at B. 2 in. 2 in. 2 in. B 2.25 in. 2.40 in. 2.25 in. (a) Determine the value of the moment M in ft · Ib to increase the clamping force. (Enter the magnitude.) ft · Ib (b) Determine the value of the moment M in ft · Ib to decrease the clamping force. (Enter the magnitude.) ft · Ib
In the old-fashioned printing press of Fig. square-threaded screw is used to press the paper against the type bed. The single-threaded screw has a mean radius of 20 mm and a lead of 100 mm. The coefficient of friction is 0.15, and the clamping force necessary to guarantee clear printing on all parts of the paper is 400 N. Determine the twisting moment necessary to operate the press and whether or not a moment must be applied to release the press. P
Determine the force P required to move the wedge to the right if the coefficient of static friction is 0.35 at all contact surface (Figure 3). The uniform cylinder weight, W is 20 kN, and the weight of the wedge may be neglected. 15°
A flat belt passes over two idler pulleys and under a rotating drumof diameter 8 in. The axle of the drum is free to move vertically ina slot, and a spring keeps the drum in contact with the belt. Whatis the minimum force which should be exerted by the spring if slippageis not to occur when a 30-lb · ft torque is applied to the drum? Thecoefficient of static friction between belt and drum is 0.30 and theangle of contact is 180 degrees.