The hand clamp is constructed using a square-threaded screw having a mean diameter of 36 mm, a lead of 4 mm, and a coefficient of static friction at the screw of μ = 0.3. To tighten the screw, a force of F = 20 N is applied perpendicular to the handle. Determine the clamping force in the board AB. 50 mm F 10000 F A B
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- The square-threaded screw 0f the C-clamp has a mean diameter of 8 mm and a pitch of 1.6 mm. The coefficient of static friction between the threads is 0.2. If the torque C=1.50Nm is used to tighten the clamp, determine (a) the clamping force; and (b) the torque required to loosen the clamp.The single-plate clutch transmits the torque C from the input shaft on the left to the output shaft on the right. Compression springs between the clutch housing and the pressure plate provide the necessary pressure on the friction surface. The splines prevent the clutch plate from rotating relative to the output shaft. If Ri=4 in. and R0=9 in., determine the total force that must be applied to the pressure plate by the springs if the clutch is to transmit a torque of C=56lbft when it is new.The leather rein used to fasten the horse to the hitching rail weighs 3.5 oz per foot. The coefficient of static friction between the rail and the rein is 0.6. If a 34-lb force acting on the bridle is sufficient to restrain the horse, determine the smallest safe length L for the free end of the rein.
- A square threaded screw is used to clamp two boards together. The clamping force on the boards is 1000 lb, determine the torque needed to tighten the score to this compressive force. The double square-threaded screw has a mean diameter of 1.0 in. and a pitch of 0.25 in. The coefficient of static friction is μs=0.15The 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 · IbA horizontal force of F = 40 N is applied perpendicular to the handle of the lever at E. The mean diameter and lead of the single square-threaded screw at C and D are 25 mm and 5 mm, respectively.The coefficient of static friction is μs = 0.3. (Figure 1) Determine the clamping force developed at G.
- A ladder is leaning against a vertical wall, and both ends of the ladder are at the point of slipping. The coefficient of static friction between the ladder and the horizontal surface is ₁0.215 and the coefficient of friction between the ladder and the wall is #₂ = 0.303. Determine the maximum angle a with the vertical that the ladder can make without falling on the ground. α= x10 TOOLS LThe frictional coefficient has a value of 0.26795, and the normal force is 20kN. Determine the angle of friction.3. The pulley has a radius of 3". And fits loosely on the 0.5" diameter shaft. If the loadings acting on the belt cause the pulley to rotate with constant angular velocity, determine the frictional force between the shaft and the pulley and compute the coefficient of kinetic friction. The pulley weighs 18lbs 3 in. 5 lb 5.5 lb
- Two hemispheres having an inner radius of 2 ft and wall thickness of 0.25 in. are fitted together, and the inside pressure is reduced to -10 psi. If the coefficient of static friction is ms = 0.5 between the hemispheres, determine (a) the torque T needed to initiate the rotation of the top hemisphere relative to the bottom one, (b) the vertical force needed to pull the top hemisphere off the bottom one, and (c) the horizontal force needed to slide the top hemisphere off the bottom one.The high strength, square-threaded bolt that holds the three plates together has a nominal diameter of 1 in. The coefficient of friction is us = 0.36. The mean diameter of the thread is 0.94 in. The lead of the bolt is L = 0.160 in. Neglect friction between the nut and the washer. Determine the torque one must apply in in. Ib to the nut to induce a tension of 47,500 lb. (Enter the magnitude.) in. · Ib When that tension is achieved, determine the torque in in. · Ib required to loosen the bolt. (Enter the magnitude.) in. • IbThe block brake is used to stop the wheel from rotating when the wheel is subjected to a couple moment Mo = 540 N.m. If the 0.6m 0:4m coefficient of static friction between the wheel and the block is 0.5, determine the smallest force P that should be applied. Cx 1m O A) 0.4 m 0.05m B 0.05 m Ne 0,3 m Draw free body diagram of the block brake. (ignore the weight of the wheel) 0.6m 0.4m Which following one is true? O B) Cx 0.05m P. No 0-6m 0.4M 0.05m P 0-6m 0.4M Cx O D) Fs 6.05m No P. 0-6m J 0.4m Ca Ne