1. Using the AGMA refined approach, design a high-precision single-reduction straight spur gear unit to operate from a 50-hp electric motor running at 5100 rpm to drive a rotating machine operating at 1700 rpm. The motor operates steadily at full rated power. A life of 107 pinion revolutions is desired, and a reliability of 99 … Read more

1. An existing parallel-shaft single-reduction spur gear speed reducer is made up of a 21-tooth 8-pitch input pinion driving a 73-tooth gear mounted on the output shaft. The center distance between pinion and gear is 5.875 inches. The input shaft is driven by a 15-hp, 1725-rpm electric motor operating steadily at full rated capacity. To … Read more

1.For the Coniflex® bevel gearset described in problem 15-53, the following information has been tabulated or calculated: 630 in-lb 6 2.50 inches 1.15 inches 15 teeth 45 teeth Further, it is proposed to use Grade 2 AISI 4140 steel nitrided and through-hardened to BHN 305 for both the pinion and the gear. Other known design … Read more

1.A proposed worm gearset is to have a single-start worm with a pitch diameter of 1.250 inches, a diametral pitch of 10, and a normal pressure angle of 14 . The worm is to mesh with a worm gear having 40 teeth and a face width of 0.625 inch. Calculate the following: a. Axial pitch … Read more

1.A double-start worm has a lead of 60 mm. The meshing worm gear has 30 teeth, and has been cut using a hob having a module of 8.5 in the normal plane. Do the following: a. Calculate the pitch diameter of the worm. b. Calculate the pitch diameter of the worm gear. c. Calculate the … Read more

1.It is proposed to drive an industrial crushing machine, designed to crush out-of-tolerance scrap ceramic bearing liners, with an in-stock 2-hp, 1200-rpm electric motor coupled to an appropriate speed reducer. The crushing machine input shaft is to rotate at 60 rpm. A worm gear speed reducer is being considered to couple the motor to the … Read more

1. A worm gear speed reducer has a right-hand triplethreaded worm made of hardened steel, a normal pressure angle of 20, an axial pitch of 0.25 inch, and a center distance of 2.375 inches. The gear is made of forged bronze. The speed reduction from input to output is 15:1. If the worm is driven … Read more

1.A simple band brake is constructed using a 0.050-inchthick by 2-inch-wide steel band to support the tensile forces. Carbon-graphite material is bonded to the inside of the steel band to provide the friction surface for braking, and the rotating drum is to be a solid-steel cylinder, 16 inches in diameter and 2 inches in axial … Read more

1.A disk clutch is being proposed for an industrial application in which the power-input shaft supplies 12 kw steadily at 650 rpm. The patented friction lining material, which is to be bonded to one or more annular disk surfaces, is to be brought into contact with stiff steel disks to actuate the clutch. The outside … Read more

1.A disk brake is to be constructed for use on a highspeed rotor balancing machine. It has been decided that a carbon-graphite friction material will be used against a steeldisk mating surface to provide the braking action. The environment is dry. For clearance reasons the inner diameter of the steel brake disk must be 10.0 … Read more