Mechanical Design Engineering Handbook 1st. Edition by Peter R.N. Childs | 9780080977591 | 80977596 | Holooly

Mechanical Engineering Design

Mechanical Design Engineering Handbook

92 SOLVED PROBLEMS

Question: 19.1

Find the shaft and hole dimensions for a loose running fit with a 35-mm-diameter basic size. ...

Verified Answer:

From Table 19.1, the ISO symbol is 35H11/c11 (the ...

Question: 19.2

Find the shaft and hole dimensions for a medium drive fit using a basic hole size of 60 mm. ...

Verified Answer:

From Table 19.1, the ISO symbol is 60H7/s6. Table ...

Question: 19.9

The torque capacity, T, for a multiple disc clutch can be calculated using the relationship T =2/3 µ FaN ( r³ o – r³/ r² o – r²) where µ is the coefficient of friction, Fa is the axial clamping force, N is the number of disc faces, ro is the outer radius of clutch ring, and ri is the inner radius ...

Verified Answer:

T_{a v}=\frac{2}{3} \times 0.3 \times 4000 ...

Question: 19.8

In the design work for a model single cylinder reciprocating engine, the work done during the expansion stroke is to be represented as: W = PπD²C ( 1 – Q^n-1) / (4(n – 1)) where Q = C/(C + 2R) and C = M – R – L – H The quantities are defined as follows: W is the work done during the expansion ...

Verified Answer:

The sure-fit “extreme” limit of the work done is g...

Question: 19.7

The stiffness of a helical compression spring (see Figure 19.12) can be calculated from k = d^4G/8D³n where d is the wire diameter, G is the modulus of rigidity, D is the coil diameter, n is the number of coils, and k is the spring stiffness. The mean and standard deviation for each variable are ...

Verified Answer:

Substituting values into the equation for k to giv...

Question: 19.6

Which of the following two methods of manufacturing a product 150 mm in length would give the best overall tolerance? 1. An assembly of 10 components, each of length 15.000 mm with tolerance limits of ± 0.050 mm. 2. A single component of 150 mm also with tolerance limits of ±0.050 mm. ...

Verified Answer:

1.

\sigma_{1}=0.05 / 3[/latex...

Question: 19.4

A product is made by aligning four components (see Figure 19.11) whose lengths are x1, x2, x3, and x4. The overall length is denoted by z. The tolerance limits of the lengths are known to be 8.000 ± 0.030, 10.000 ± 0.040, 15.000 ± 0.050, and 7.000 ± 0.030 mm, respectively. If the lengths of the ...

Verified Answer:

Assuming ±3σ natural tolerance limits:

\sig...

Question: 17.1

Select a wire rope for a hoist required to lift 800 kg. The hoist design uses two lines to support the load attached to a vertically moving sheave, on which the swivel hook is mounted. The desired design life is 2 years, and the anticipated maximum use is 20 lifts per hour,7.5 h a day for 220 days ...

Verified Answer:

Load = 400 × 9.81 = 3924 N. From Figure 17.4, goin...

Question: 16.4

Determine the safe tensile, shear, and bearing loads and the efficiency for a 300 mm section of single-riveted lap joint made from ¼ in. plates using six 16-mm-diameter rivets. Assume that the drilled holes are 1.5 mm larger in diameter than the rivets. The values for the design limits for tensile ...

Verified Answer:

The safe tensile load, L, based of shear of the ri...

Question: 16.3

A self-locking power screw is required for a screw jack. An initial proposal is to use a single start 1.25-5 Acme power screw. The axial load is 4000 N and collar mean diameter is 1.75 in. Determine the lifting and lowering torques, the efficiency of the power screw, and whether the design ...

Verified Answer:

Single start thread, so the lead, L, is equal to t...

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