. Find the width of the belt used it
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- The square-threaded screw with a pitch of 10 mm and a mean radius of 18 mm drives a gear that has a mean radius of 75 mm. The static and kinetic coefficients of friction between the gear and the screw are 0.12 and 0.06, respectively. The input torque applied to the screw is C0=10Nm. Assuming constant speed operation, determine the output torque C1 acting on the gear.The coeffient of static friction between the uniform bar AB of weight W and the ground is 0.45. Find the smallest angle and the corresponding force P that would initiate simultaneous tipping and sliding of the bar.The block of weight W is pulled by the force P inclined at the angle to the horizontal. Find the smallest force P and the corresponding angle that would cause impending sliding of the block. The angle of static friction between the block and the ground is s.
- The clutch described in Prob. 7.75 is to transmit a torque of 120lbft when the total spring force exerted on the pressure plate is 75 lb. If Ri=4in., calculate the minimum acceptable value for RO. Assume that the clutch is new.A pulley system uses four v-section belts each with a cross-sectional area of 700mm 2, an included angle of 40°, and density 1400kg/m 3 The angle of lap is 130° on the smaller wheel, the coefficient of friction is 0.4 and the maximum force allowed in the belt is 500N. Calculate the initial belt tension and reason for this.A pulley, 610 mm. in diameter, transmits 40 kW at 500 rpm. The arc of contact between the belt and the pulley is 144 degrees, the coefficient of friction between the belt and the pulley is 0.35 and the safe working stress of the belt is 2.1 MPa. Find the width of the belt if its thickness is 6 mm.
- A 600 mm steel pulley transmits 50 kW at 900 rpm. The arc of contact between the belt and pulley is 144 degrees, the coefficient of friction between belt and pulley is 0.3 and the safe working stress of the belt is 2750 kPa. Find the width of the belt used if the thickness is equal to 12 mm.In a thrust bearing, the external and the internal diamaters of the contacting surfaces are 320 mm and 200 mm respectively. The total axial load is 80 kN and the intensity of pressure is 350 kN/m2.The shaft rotates as 400 rpm. Taking the coefficient of friction as 0.06, calculate the power lost in overcoming the friction. Also, find the number of collars required for the bearing.Find the power transmitted by a belt running over a pulley of 600 mm diameter at200 r.p.m. The coefficient of friction between the belt and the pulley is 0.25,angle of lap 160° and maximum tension in the belt is 2500 N.
- An 6 in diameter pulley turning at 650 rpm is belt connected to a 12 in diameter pulley. Ifthere is a coefficient of friction of 0.05, and the thickness was considered because it has a thickenss of 1.25 in. find the speed of the 12 in pulley.A pulley 590 mm in diameter transmits 50 kW at 520 rpm. The arc of contact between the belt and pulley is 144 degrees, the coefficient of friction between the belt and pulley is 0.35 and the safe working stress of the belt is 2.2 MPa. Find the width of the belt used if its thickness is 8 mm.A pulley has an effective belt pull of 4 kN and an angle of belt contact of 160 deg. The working stress of the belt is 2.1 MPa. Find the thickness of the belt to be used if the width is 400 mm and the coefficient of friction is 0.30.