1.For use in a specialized underwater hoisting application, it is being proposed to design a disk clutch with a 20-inch outside diameter. Hard-drawn phosphor bronze is to be used in contact with chrome-plated hard steel to form the friction interfaces ( 0.03, 150 psi). The clutch must transmit 150 horsepower continuously at a rotational speed…

A cone clutch having a cone angle of 10 is to transmit 40 horsepower continuously at a rotational speed of 600 rpm. The contact width of the lining along an element of the cone is 2.0 inches. The lining material is wound asbestos yarn and wire, operating against steel. Assuming that the uniform wear assumption…

1.A flat belt drive system is to be designed for an application in which the input motor shaft speed (driving pulley) is 1725 rpm, the driven shaft speed is to be approximately 960 rpm, and the power to be transmitted has been estimated as 3.0 horsepower. The driven machine has been evaluated and found to…

1.A flat belt drive consists of two cast-iron pulleys, each 4 feet in diameter, spaced 15 feet apart, center-to-center. The belt is to be made of two-ply oak-tanned leather, each ply being inch thick, and the specific weight of the leather material is 0.040 lb/in3 . The application involves a water-spray environment in which the…

1.A 1725-rpm 5-horsepower high-torque electric motor is to be used to drive a woodworking table saw in a storm-window manufacturing plant. The saw is to operate 16 hours per day, 5 days per week, at full-rated motor horsepower. A V-belt drive is to be used between the motor and the saw input pulley. Ideally, the…

1. A D-section V-belt is to be used to drive the main power shaft of an agricultural combine (an agricultural combine may be regarded as a combination of conveyors, elevators, beaters, and blowers). The power source is a 6-cylinder, 30-hp internal combustion engine which delivers full-rated power to a 12-inch-diameter drive sheave at 1800 rpm.…

1.A five-strand no. 40 precision roller chain is being proposed to transmit power from a 21-tooth driving sprocket that rotates at 1200 rpm. The driven sprocket is to rotate at onequarter the speed of the driving sprocket. Do the following: a. Determine the limiting horsepower that can be transmitted by this drive, and state the…

1.It is desired to market a small air-driven hoist in which the load is supported on a single line of wire rope and the rated design load is ton (750 lb). The wire rope is to be wrapped on a drum of 7.0 inches diameter. The hoist should be able to lift and lower the…

1. An electric hoist, in which the load is supported on two lines, is fitted with a -inch improved plow steel (IPS) wire rope that wraps on an 8-inch-diameter drum and carries an 8-inch sheave with an attached hook for load lifting. The hoist is rated at 1500-lb capacity. a. If full-rated load were lifted…

1.The cylindrical bearing journal of a straddle-mounted crankshaft has been tentatively sized based on wear requirements, and it has been found that a diameter of 1.38 inches is required for this purpose. A force analysis of the journal at the critical cross section has shown there to be a transverse shear force of 8500 lb,…