Machine Elements in Mechanical Design 6th. Edition by Robert L. Mott, Edward M. Vavrek, Jyhwen Wang | 9780134441184 | 0134441184 | Holooly

Machine Elements in Mechanical Design [EXP-43711]

126 SOLVED PROBLEMS

Question: 3.8

A 2.50-in-diameter shaft carrying a chain sprocket has one end milled in the form of a square to permit the use of a hand crank. The square is 1.75 in on a side. Compute the maximum shear stress on the square part of the shaft when a torque of 15 000 lb . in is applied.

Verified Answer:

Objective: Compute the maximum shear stress and th...

Question: 16.1

A bearing is to be designed to carry a radial load of 150 lb from a shaft having a minimum acceptable diameter of 1.50 in and rotating at 500 rpm. Design the bearing to operate under boundary-lubrication conditions.

Verified Answer:

We will use the design procedure previously outlin...

Question: 5.DE.4

A bracket is made by welding a rectangular bar to a circular rod, as shown in Figure 5–19. Design the bar and the rod to carry a static load of 250 lb.

Verified Answer:

Objective: The design process will be divided into...

Question: 13.2

A bronze bushing is to be installed into a steel sleeve as indicated in Figure 13–6. The bushing has an inside diameter of 2.000 in and a nominal outside diameter of 2.500 in. The steel sleeve has a nominal inside diameter of 2.500 in and an outside diameter of 3.500 in.

Verified Answer:

For 1, from Table 13–4, for a part size of 2.50 in...

Question: 14.EP.1

A catalog lists the basic dynamic load rating for a ball bearing to be 7050 lb for a rated life of 1 million rev. What would be the expected L10 life of the bearing if it were subjected to a load of 3500 lb?

Verified Answer:

In Equation (14_1),

\frac{L_{2}}{L_{1}}=\le...

Question: 14.1

A catalog lists the basic dynamic load rating for a ball bearing to be 7050 lb for a rated life of 1 million rev. What would be the expected L10 life of the bearing if it were subjected to a load of 3500 lb?

Verified Answer:

In Equation (14–1), (

\frac{L_{2}}{L_{1}}=\l...

Question: 6.1

A column has a solid circular cross section, 1.25 inches in diameter; it has a length of 4.50 ft and is pinned at both ends. If it is made from SAE 1020 cold-drawn steel, what would be a safe column loading?

Verified Answer:

Objective: Specify a safe loading for the column. ...

Question: 6.4

A column has both ends pinned and has a length of 32 in. It has a circular cross section with a diameter of 0.75 in and an initial crookedness of 0.125 in. The material is SAE 1040 hot-rolled steel. Compute the allowable load for a design factor of 3.

Verified Answer:

Objective: Specify the allowable load for the colu...

Question: 3.17

A curved bar has a rectangular cross section 15.0 mm thick by 25.0 mm deep as shown in Figure 3–26. The bar is bent into a circular arc producing an inside radius of 25.0 mm. For an applied bending moment of +400 N . m, compute the maximum tensile and compressive stresses in the bar.

Verified Answer:

Objective: Compute the maximum tensile and compres...

Question: 3.18

A curved beam has the shape shown in Figure 3–28 and is subjected to a pure bending moment of -640 lb . in. The inside radius is 2.90 in. Compute the maximum tensile and compressive stresses in the beam

Verified Answer:

Objective: Compute the maximum tensile and compres...

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