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engineering
machine elements in mechanical design

Questions and Answers of Machine Elements In Mechanical Design

See Figure P12–2. The shaft rotating at 200 rpm carries a 6-in-diameter chain sprocket D that delivers 4 hp to a mating sprocket above. Compute the torque delivered by the shaft to sprocket D and
See Figure P12–2. The shaft rotating at 200 rpm carries a 20-in-diameter flat-belt pulley at A that receives 10 hp from below. Compute the torque delivered by the pulley to the shaft and the force
See Figure P12–3. The shaft rotating at 480 rpm carries a 10-in-diameter chain sprocket at C that receives 11 hp from a mating sprocket below and to the left as shown. Compute the torque delivered
See Figure P12–3. The shaft rotating at 480 rpm carries two 4-in-diameter sheaves at D and E that each deliver 3 hp to mating sheaves as shown. Compute the torque delivered by the shaft to each
See Figure P12–4. The shaft rotating at 120 rpm carries two identical 14-in-diameter chain sprockets at C and D. Each sprocket delivers 20 hp to mating sprockets to the left as shown. Compute the
See Figure P12–5. The shaft rotating at 240 rpm carries a 6-in-diameter chain sprocket at E that delivers 5.0 hp to a mating sprocket to the right and above as shown. Compute the torque delivered
A child’s toy wagon has an axle with a nominal diameter of 5/8 in. For the wheel bore and axle, specify the class of fit, the limits of size, and the limits of clearance. Use the basic shaft system.
The planet gear of an epicyclic gear train must rotate reliably on its shaft while maintaining accurate position with respect to the mating gears. For the planet gear bore and its shaft, specify the
The base of a hydraulic cylinder is mounted to the frame of a machine by means of a clevis joint, which allows the cylinder to oscillate during operation. The clevis must provide reliable motion, but
A heavy door on a furnace swings upward to permit access to the interior of the furnace. During various modes of operation, the door and its hinge assembly see temperatures of 50°F to 500°F. The
The stage of an industrial microscope pivots to permit the mounting of a variety of shapes. The stage must move with precision and reliability under widely varying temperatures. For the pin mount for
An advertising sign is suspended from a horizontal rod and is allowed to swing under wind forces. The rod is to be commercial bar stock, nominally 1.50 in in diameter. For the mating hinges on the
A bronze bushing, with an inside diameter of 3.50 in and a nominal outside diameter of 4.00 in, is pressed into a steel sleeve having an outside diameter of 4.50 in. For an FN3 class of fit, specify
It is proposed to install a steel rod with a nominal diameter of 3.00 in in a hole of an aluminum cylinder with an outside diameter of 5.00 in, with an FN5 force fit. Would this be satisfactory?
The allowable compressive stress in the wall of an aluminum tube is 8500 psi. Its outside diameter is 2.000 in, and the wall thickness is 0.065 in. What is the maximum amount of interference between
A radial ball bearing has a basic dynamic load rating of 2350 lb for a rated (L10) life of 1 million rev. What would its L10 life be when operating at a load of 1675 lb?
Determine the required basic dynamic load rating for a bearing to carry 1250 lb from a shaft rotating at 880 rpm if the design life is to be 20 000 h.
If an Acme-thread power screw is loaded in tension with a force of 30 000 lb, what size screw from Table 17–1 should be used to maintain a tensile stress below 10 000 psi? Data in Table 17–1
Compute the required basic dynamic load rating, C, for a ball bearing to carry a radial load of 1450 lb at a shaft speed of 1150 rpm for an industrial fan.
Compute the torque required to raise the load of 30 000 lb with the Acme screw selected in Problem 5. Use a coefficient of friction of 0.15. Data in Problem 5.If an Acme-thread power screw is loaded
Compute the basic dynamic load rating, C, for a ball bearing to carry a radial load of 1250 lb at a shaft speed of 880 rpm for a design life of 20 000 hours. Use a reliability of 95%.
Compute the torque required to lower the load with the screw from Problem 5.Data in Problem 5.If an Acme-thread power screw is loaded in tension with a force of 30 000 lb, what size screw from Table
Name four types of threads used for power screws.
A ball screw for a machine table drive is to be selected. The axial force to be transmitted by the screw is 600 lb. The table moves 24 in per cycle, and it is expected to cycle 10 times per hour for
If the cycle time for the machine in Problem 14 were decreased to obtain 20 cycles/h instead of 10, what would be the expected life in years of the screw originally selected?Data in Problem 14,A ball
Specify a suitable size for a metric trapezoidal power screw that is subjected to a tensile load of 125 kN while keeping the tensile stress below 75 MPa.
Compute the torque required to raise the load vertically for the screw selected in Problem 24. Use a coefficient of friction of 0.15.Data in Problem 24,Specify a suitable size for a metric
Specify a suitable size for a metric trapezoidal power screw that is subjected to a tensile load of 8500 N while keeping the tensile stress below 110 MPa.
Describe the difference between a screw and a bolt.
Define the term proof strength.
Define the term clamping load.
Specify suitable machine screws to be installed in a pattern of four, equally spaced around a flange, if the clamping force between the flange and the mating structure is to be 6000 lb. Then
What would be the tensile proof force in newtons (N) in a machine screw having a major diameter of 4 mm with standard fine threads if it is made from steel having a metric strength grade of 8.6?
A machine screw is found with no information given as to its size. The following data are found by using a standard micrometer caliper: The major diameter is 0.196 in; the axial length for 20 full
Describe the differences among welding, brazing, and soldering.
What types of metals are typically brazed?
What are some common brazing alloys?
What materials make up commonly used solders?
Name five common adhesives, and give the typical properties of each.
The label of a common household adhesive describes it as a cyanoacrylate. What would you expect its properties to be?
Find three commercially available adhesives from your home, a laboratory, a machine shop, or your workplace. Try to identify the generic nature of the adhesive, and compare it with the list presented
A sealing application involves the following conditions: exposure to high temperature and weather, impermeability, and high strength and abrasion resistance. Specify a suitable elastomer for the seal.
A helical gear has a normal diametral pitch of 12, a normal pressure angle of 20°, 48 teeth, a face width of 1.50 in, and a helix angle of 45°. (a) If the gear transmits 2.50 hp at a speed of
For Problem 5–11, complete the design of a pair of helical gears to operate under the stated conditions. Specify the geometry of the gears and the material and its heat treatment. Assume that the
For Problem 5–11, complete the design of a pair of helical gears to operate under the stated conditions. Specify the geometry of the gears and the material and its heat treatment. Assume that the
For Problem 5–11, complete the design of a pair of helical gears to operate under the stated conditions. Specify the geometry of the gears and the material and its heat treatment. Assume that the
For Problem 5–11, complete the design of a pair of helical gears to operate under the stated conditions. Specify the geometry of the gears and the material and its heat treatment. Assume that the
For Problem 5–11, complete the design of a pair of helical gears to operate under the stated conditions. Specify the geometry of the gears and the material and its heat treatment. Assume that the
For Problem 5–11, complete the design of a pair of helical gears to operate under the stated conditions. Specify the geometry of the gears and the material and its heat treatment. Assume that the
For Problem 5–11, complete the design of a pair of helical gears to operate under the stated conditions. Specify the geometry of the gears and the material and its heat treatment. Assume that the
Compare the two designs described in Table 10–7 when each is transmitting 1200 lb • in of torque at its output shaft, which rotates at 20 rpm. Compute the forces on the worm and the wormgear, the
Determine the power-transmitting capacity of a pair of helical gears having a normal pressure angle of 20°, a helix angle of 15°, a normal diametral pitch of 10, 20 teeth in the pinion, 75 teeth in
Design a pair of straight bevel gears to transmit 5.0 hp at a pinion speed of 850 rpm. The gear speed should be approximately 300 rpm. Consider both strength and pitting resistance. The driver is a
Describe a Woodruff key no. 204.
Make a drawing of a four-spline connection having a major diameter of 1.500 in and an A fit. Show critical dimensions. See Figure P11–16 for the general layout.Data in Figure P11–16
Describe a Woodruff key no. 1628.
Make a drawing of a 10-spline connection having a major diameter of 3.500 in and a B fit. Show critical dimensions.
Make a drawing of a 16-spline connection having a major diameter of 2.500 in and a C fit. Show critical dimensions.
Describe the manner in which a set screw transmits torque if it is used in place of a key. Discuss the disadvantages of such an arrangement.
Describe a press fit as it would be used to secure a power transmission element to a shaft.
Describe the main differences between rigid and flexible couplings as they affect the stresses in the shafts that they connect.
Discuss a major disadvantage of using a single universal joint to connect two shafts with angular misalignment.
Describe five ways to locate power transmission elements positively on a shaft axially.
Describe three situations in which seals are applied in machine design.
List eight parameters that should be considered when selecting a type of seal and specifying a particular design.
Name three means of sealing a pressurized container under static conditions.
Name three methods of sealing a closed container while allowing relative movement of some part.
Name four types of seals used on reciprocating rods or pistons.
Name three types of seals applied to rotating shafts.
Describe the method of sealing a ball bearing from contaminants.
Describe a T-ring seal, and sketch its installation.
Describe some advantages of T-ring seals over O-rings.
Describe an O-ring seal, and sketch its installation.
Describe a diaphragm seal and the type of situation in which it is used.
Describe suitable methods of sealing the sides of a piston against the inner walls of the cylinder of a hydraulic actuator.
Describe the function of a scraper or wiper on a cylinder rod.
Describe the essential elements of a mechanical face seal.
Name at least six kinds of elastomers commonly used for seals.
Name at least three kinds of elastomers that are recommended for use when exposed to weather.
Name at least three kinds of elastomers that are recommended for use when exposed to petroleum-based fluids.
Name at least three kinds of elastomers that are recommended for use when exposed to cold-temperature operation.
Name at least three kinds of elastomers that are recommended for use when exposed to high-temperature operation.
Describe suitable shaft design details where elastomeric seals contact the shaft.
For Problems 29–32, all gears are made in standard 20°, full-depth, involute form. Tell what is wrong with the following statements:An 8-pitch pinion having 24 teeth mates with a 10-pitch gear
A gear has 44 teeth of the 20°, full-depth, involute form and a diametral pitch of 12. Compute the following: (a) Pitch diameter (b) Circular pitch (c) Equivalent module (d)
Repeat Problem 1 for the following gears:N = 34; Pd = 24Problem 1A gear has 44 teeth of the 20°, full-depth, involute form and a diametral pitch of 12. Compute the following: (a) Pitch
Repeat Problem 1 for the following gears:N = 45; Pd = 2Problem 1A gear has 44 teeth of the 20°, full-depth, involute form and a diametral pitch of 12. Compute the following: (a) Pitch
Repeat Problem 1 for the following gears:N = 18; Pd = 8Problem 1A gear has 44 teeth of the 20°, full-depth, involute form and a diametral pitch of 12. Compute the following: (a) Pitch
Repeat Problem 1 for the following gears:N = 22; Pd = 1.75Problem 1A gear has 44 teeth of the 20°, full-depth, involute form and a diametral pitch of 12. Compute the following: (a) Pitch
Repeat Problem 1 for the following gears:N = 20; Pd = 64Problem 1A gear has 44 teeth of the 20°, full-depth, involute form and a diametral pitch of 12. Compute the following: (a) Pitch
Repeat Problem 1 for the following gears:N = 180; Pd = 80Problem 1A gear has 44 teeth of the 20°, full-depth, involute form and a diametral pitch of 12. Compute the following:(a) Pitch
Repeat Problem 1 for the following gears:N = 28; Pd = 18Problem 1A gear has 44 teeth of the 20°, full-depth, involute form and a diametral pitch of 12. Compute the following:(a) Pitch
Repeat Problem 1 for the following gears:N = 28; Pd = 20Problem 1A gear has 44 teeth of the 20°, full-depth, involute form and a diametral pitch of 12. Compute the following:(a) Pitch
Repeat Problem 1 for the following gears in the metric module system. Replace Part (c) with equivalent Pd and Part (d) with nearest standard Pd.N = 34; m = 3Problem 1A gear has 44 teeth of the 20°,
Repeat Problem 1 for the following gears in the metric module system. Replace Part (c) with equivalent Pd and Part (d) with nearest standard Pd.N = 45; m = 1.25 Problem 1A gear has 44 teeth of
Repeat Problem 1 for the following gears in the metric module system. Replace Part (c) with equivalent Pd and Part (d) with nearest standard Pd.N = 18; m = 12 Problem 1A gear has 44 teeth of the
Repeat Problem 1 for the following gears in the metric module system. Replace Part (c) with equivalent Pd and Part (d) with nearest standard Pd.N = 22; m = 20 Problem 1 A gear has
Repeat Problem 1 for the following gears in the metric module system. Replace Part (c) with equivalent Pd and Part (d) with nearest standard Pd.N = 20; m = 1 Problem 1A gear has 44 teeth of the
Repeat Problem 1 for the following gears in the metric module system. Replace Part (c) with equivalent Pd and Part (d) with nearest standard Pd.N = 180; m = 0.4 Problem 1A gear has 44 teeth of
Repeat Problem 1 for the following gears in the metric module system. Replace Part (c) with equivalent Pd and Part (d) with nearest standard Pd.N = 28; m = 1.5 Problem 1A gear has 44 teeth of

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