A press that delivers 115 strokes per minute, each stroke providing a force of 7826 N throughout a distance of 18 mm. The press efficiency is 90% and is driven by a 1749-rpm motor. Determine average torque that must be provided by the motor in the units of N-m.
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A press that delivers 115 strokes per minute, each stroke providing a force of 7826 N throughout a distance of 18 mm. The press efficiency is 90% and is driven by a 1749-rpm motor.
Determine average torque that must be provided by the motor in the units of N-m.
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- Question 4 A pulley is driven by a flat belt, the angle of lap being 120°. The belt is 100 mm wide by 6 mm thick and density is 1000 kg/m. If the coefficient of friction is 0.3 and the maximum stress in the belt is not to exceed 1.5 MPa. Calculate: 4.1. 4.2. the speed of the belt in m/s using the information related to driving pulley. the centrifugal tension and the tension on the first tight side of the belt T1. the greatest power the belt can transmit. 4.31. A 4-stroke, single-cylinder gasoline engine has 85-mm bore and 85-mm stroke. What is the piston displacement of the engine? If the engine has a 10-compression ratio, what is its clearance volume? What would be the total volume of the cylinder? 2. A four-stroke gasoline engine is running at a speed of 3,000 rpm. The piston diameter is 4 inches while the stroke is 4.5 inches. What is the speed of the piston? 3. A four-cylinder gas engine has 20-cm cylinder diameter and 40-cm stroke. The cylinders run at 150 rpm speed. The engine is a four-stroke cycle with 8 kg/cm² mean effective pressure. What is the area in cm2 and length of stroke of the engine piston in meter? Also, compute the power stroke per min per cylinder and the total power stroke of the 4 cylinders. Compute the indicated horsepower and the brake horsepower of the engine. And, what is the stroke-to-bore ratio of the engine? 4. Compute the specific fuel consumption of the 10 hp engine that drive a power tiller if it…A 220 mm diameter of 14.5 degrees involute gear is used to transmit 50 kW at 580 rpm Find the total force transmitted on the gear.
- Spur gear train is used to transmit the power of 2kW from input gear A rotating at 120 rpm to output gear D through a compound gear BC. The number of teeth on the gear A, B, C and D are 16, 32, 12 and 18 respectively. Given: Module = 4mm, pressure angle=20° The tangential force acting on the gear B is N A D ВA belt drive is required to transmit 10 kW from a motor running at "600 rpm. The belt is 12 mm thick -and -has a mass density of 0.001 g/mm3. Safe stress in the belt is not to exceed 2.5 N/mm2. Diameter of the driving pulley is 250 mm, whereas the speed of the driven pulley is 220 rpm. The two shafts are 1.25 m apart. The coefficient of friction is 0.25. Determine the width of the belt.A fan is driven by a belt from a motor which runs at 880 rpm. A medium double ply leather belt 5/16 inches thick and 10 inches wide is used. The diameters of the motor pulley and the driven pulley are 14 inches and 54 inches, respectively. The center distance is 54 inches and both pulleys are made of cast iron. Coefficient of friction of leather on cast iron is 0.35. The allowable stress of the belt is 350 psi and the belt weighs 0.035 lb/in^3. What is the horsepower capacity of the belt?
- In a wheel and differential axle type of lifting machine, a crank handle of 240 mm radius takes the place of the wheel and the diameters of the differential axle are 110 mm and 80 mm respectively. If an effort of 80 N is required at the handle to lift a load of 1.12 kN, find the velocity ratio, mechanical advantage and efficiency at this load.A press tool machine uses a flywheel in the form of a solid steel disc 0.7 m diameter and 0.1 m thick rotating with a mean speed of 60 rev/min. The density of the steel is 7830 kg/m^3. The press is operated once every 5 revolutions and a torque of 2000 Nm is exerted on the tool for a duration of 0.05 seconds. The energy absorbed is replaced during the rest of the cycle. Sketch the torque angle diagram and determine the following. The mass of the flywheel .The moment of inertia .The work done during the pressing operation .The coefficient of fluctuation of speed. The maximum and minimum speeds of the flywheelHomework 2 A pulley is driven by a flat belt, the angle of lap being 120º. The belt is 100 mm wide by 6 mm thick and density1000 kg/m3. If the coefficient of friction is 0.3 and the maximum stress in the belt is not to exceed 2 MPa, find the greatest power which the belt can transmit and the corresponding speed of the belt.
- 4. The weight of each wheel of a motor driven traveling crane moving at 600fpm is 5800 Ibs. If the coefficient of rolling friction is 0.05, find the horsepower required to overcome friction. 5. Compute the force necessary to move a 6000 lbs supported on four wheels of 2.5 ft diameter, assuming the coefficient of rolling friction to be 0.007.A 150lb man stands on a 60lb bar to which a cable is fixed at B. The cable passes over two fixed pegs with coefficients of friction indicated. Assume that the arrangement of the pegs permits the cable to contact each peg over a total angle of 90-degrees (90-degrees per peg). Assume that the normal force exerted by the man on the bar acts downward through A. Find the largest force the man can exert on the cable and maintain the bar horizontal.The outside diameter of a hollow shaft is 1.6 times the inside diameter. When transmitting 420 W of power at 180 rpm, the angle of twist is one degree over a length of 40 times the inside diameter. Taking G for the material as 85 GN/m^2, determine the outside diameter of the hollow shaft in mm.