DeGarmo's Materials and Processes in Manufacturing
12th Edition
ISBN: 9781118987674
Author: J. T. Black, Ronald A. Kohser
Publisher: WILEY
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Textbook Question
Chapter 30, Problem 5RQ
How are multiple depths of cut (steps) produced by chemical machining?
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For the walking-beam mechanism shown in Figure 3, find and plot the x and y coordinates of the
position of the coupler point P for one complete revolution of the crank O2A. Use the coordinate
system shown in Figure 3. Hint: Calculate them first with respect to the ground link 0204 and
then transform them into the global XY coordinate system.
y
-1.75
Ꮎ
Ꮎ
4
= 2.33
0242.22
L4
x
AP = 3.06
L2 = 1.0
W2
31°
B
03 L3 = 2.06
P
1
8
5
.06
6
7
P'
The link lengths, gear ratio (2), phase angle (Ø), and the value of 02 for some geared five bar
linkages are defined in Table 2. The linkage configuration and terminology are shown in Figure
2. For the rows assigned, find all possible solutions for angles 03 and 04 by the vector loop
method. Show your work in details: vector loop, vector equations, solution procedure.
Table 2
Row
Link 1 Link 2
Link 3
Link 4
Link 5
λ
Φ
Ө
a
6
1
7
9
4
2
30°
60°
P
y 4
YA
B
b
R4
R3
YA
A
Gear ratio:
a
02
d
05
r5
R5
R2
Phase angle: = 0₂-202
R1
05
02
r2
Figure 2.
04
X
Problem 4
A .025 lb bullet C is fired at end B of the 15-lb slender bar AB. The
bar is initially at rest, and the initial velocity of the bullet is 1500 ft/s
as shown. Assuming that the bullet becomes embedded in the bar,
find (a) the angular velocity @2 of the bar immediately after impact,
and (b) the percentage loss of kinetic energy as a result of the impact.
(c) After the impact, does the bar swing up 90° and reach the
horizontal? If it does, what is its angular velocity at this point?
Answers: (a). @2=1.6 rad/s; (b). 99.6% loss
=
(c). Ah2 0.212 ft. The bar does not reach horizontal.
y
X
4 ft
15 lb
V₁
1500 ft/s
0.025 lb
C
30°7
B
A
Chapter 30 Solutions
DeGarmo's Materials and Processes in Manufacturing
Ch. 30 - How do the MRRs for most NTM processes compare to...Ch. 30 - What are the steps in chemical machining using...Ch. 30 - In chemical machining, should the etchant be...Ch. 30 - What are the advantages of chemical blanking over...Ch. 30 - How are multiple depths of cut (steps) produced by...Ch. 30 - Would it be feasible to produce a groove 2 mm wide...Ch. 30 - A drawing calls for making a groove 23 mm wide and...Ch. 30 - Could an ordinary steel weldment be chemically...Ch. 30 - How could you produce a tapered section by...Ch. 30 - What is the principal application of...
Ch. 30 - How is ECM related to chemical machining?Ch. 30 - What effect does work material hardness have on...Ch. 30 - What is the principal cause of tool wear in ECM?Ch. 30 - Would electrochemical grinding be a suitable...Ch. 30 - Upon what factors does the metal removal rate...Ch. 30 - Why is the tool insulated in the ECM schematic?Ch. 30 - What is the nature of the surface obtained by...Ch. 30 - What is the principal advantage of using a moving...Ch. 30 - What effect would increasing the voltage have on...Ch. 30 - If a metal part is quite brittle and the part will...Ch. 30 - If you had to make several holes in a large number...Ch. 30 - Prob. 22RQCh. 30 - Explain (using a little physics and metallurgy)...Ch. 30 - Prob. 24RQCh. 30 - What are some possible defects that can result...Ch. 30 - What are some other uses for the laser other than...Ch. 30 - How does the laser produce coherent light...Ch. 30 - What is ablation?Ch. 30 - What is an excimer?Ch. 30 - In Figure 30.16, what is the protective tape...Ch. 30 - Why is the EBM process done in a vacuum?Ch. 30 - What is the major problem with the redesigned cap...
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