ME 452 - Machine Design II
Name of Student:_
Spring Semester 2014
Lecture Division Number:_
Homework No. 1 (40 points). Due at the beginning of lecture on Friday, January 24th.
Important notes for homework assignments (applicable to all homework this seme
ME 452 - Machine Design II
Name of Student:_
Spring Semester 2014
Lecture Division Number:_
Project 1. Due at the beginning of lecture on Monday, February 3rd.
A formal report is not required for this project. The solution must be presented on engineering
ME 452 - Machine Design II
Name of Student:_
Spring Semester 2014
Lecture Division Number:_
Homework No. 1 (50 points). Due at the beginning of lecture on Friday, January 24th.
Important notes for homework assignments (applicable to all homework this seme
ME 452: Machine Design II
Solution to Homework Set 4.
Moment arm should be 142 mm not 138 in this solution
Problem 1. (Problem 6-29, page 351)
The figure is a drawing of a 4- by 20-mm latch spring. A preload is obtained during the
assembly by shimming und
Chapter 1
Problems 1-1 through 1-6 are for student research. No standard solutions are provided.
From Fig. 1-2, cost of grinding to 0.0005 in is 270%. Cost of turning to 0.003 in is
60%.
Relative cost of grinding vs. turning = 270/60 = 4.5 times
Ans.
_
1-
Chapter 2
2-1
From Tables A-20, A-21, A-22, and A-24c,
(a) UNS G10200 HR: S ut = 380 (55) MPa (kpsi), S yt = 210 (30) Mpa (kpsi) Ans.
(b) SAE 1050 CD: S ut = 690 (100) MPa (kpsi), S yt = 580 (84) Mpa (kpsi) Ans.
(c) AISI 1141 Q&T at 540C (1000F): S ut = 8
ME 452 - Machine Design II
Name of Student:_
Spring Semester 2014
Lecture Division Number:_
Homework No. 2 (40 points). Due at the beginning of lecture on Friday, January 31st.
Solve the following problems taken from Chapter 5, Shigleys Mechanical Enginee
Chapter 6
Eq. (2-21):
Eq. (6-8):
Table 6-2:
Eq. (6-19):
Sut 3.4 H B 3.4(300) 1020 MPa
Se 0.5Sut 0.5(1020) 510 MPa
a 1.58, b 0.085
b
ka aSut 1.58(1020) 0.085 0.877
Eq. (6-20):
6-1
kb 1.24d 0.107 1.24(10) 0.107 0.969
Se ka kb Se (0.877)(0.969)(510) 433 MPa
Chapter 4
For a torsion bar, k T = T/ = Fl/, and so = Fl/k T . For a cantilever, k l = F/ , = F/k l . For
the assembly, k = F/y, or, y = F/k = l +
Thus
F Fl 2 F
y
k
kT kl
Solving for k
kk
1
k 2
2l T
Ans.
l
1 kl l kT
kT kl
_
4-1
For a torsion bar, k T =
Chapter 9
Figure for Probs.
9-1 to 9-4
9-1
Given, b = 50 mm, d = 50 mm, h = 5 mm, allow = 140 MPa.
F = 0.707 hl allow = 0.707(5)[2(50)](140)(103) = 49.5 kN Ans.
_
9-2
Given, b = 2 in, d = 2 in, h = 5/16 in, allow = 25 kpsi.
F = 0.707 hl allow = 0.707(5/16
Chapter 7
7-1
(a) DE-Gerber, Eq. (7-10):
A 4 K f M a 3 K fsTa 4 (2.2)(70) 3 (1.8)(45) 338.4 N m
2
2
2
2
B 4 K f M m 3 K fsTm 4 (2.2)(55) 3 (1.8)(35) 265.5 N m
2
2
2
6
8(2)(338.4) 2(265.5) 210 10
d
1 1
6
6
210 10 338.4 700 10
3
d = 25.85 (10 ) m = 25.8
ME 452 - Machine Design II
Name of Student:_
Spring Semester 2014
Lecture Division Number:_
Homework No. 12 (40 points). Due at the beginning of lecture on Wednesday, April 30th.
Solve the following problems from Chapter 16, Shigleys Mechanical Engineerin
ME 452 - Machine Design II
Name of Student:_
Spring Semester 2014
Lecture Division Number:_
Homework No. 11 (40 points). Due at the beginning of lecture on Monday, April 21st.
Solve the following problems from Chapter 8, Shigleys Mechanical Engineering De
ME 452 - Machine Design II
Name of Student:_
Spring Semester 2014
Lecture Division Number:_
Homework No. 10 (40 points). Due at the beginning of lecture on Monday, April 14th.
Solve the following problems from Chapter 8, Shigleys Mechanical Engineering De
ME 452 - Machine Design II
Name of Student:_
Spring Semester 2014
Lecture Division Number:_
Homework No. 9 (40 points). Due at the beginning of lecture on Monday, April 7th.
Solve the following problems from Chapter 10, Shigleys Mechanical Engineering Des
ME 452 - Machine Design II
Name of Student:_
Spring Semester 2014
Lecture Division Number:_
Stress analysis and design of a crankshaft
Formal Report: Due in Room ME 3003, before noon, Wednesday, April 2nd.
A group of research and development engineers in
ME 452 - Machine Design II Spring Semester 2014
Name of Student:_ Lecture Division Number:_
Homework No. 7 (30 points). Due at the beginning of lecture on Friday, March 7th.
Solve the following problems from Chapter 12, Shigley's Mechanical Engineering De
ME 452 - Machine Design II
Name of Student:_
Spring Semester 2014
Lecture Division Number:_
Homework No. 6 (30 points). Due at the beginning of lecture on Friday, February 28th.
Solve the following problems from Chapter 11, Shigleys Mechanical Engineering
ME 452 - Machine Design II Spring Semester 2014
Name of Student:_ Lecture Division Number:_
Homework No. 5 (30 points). Due at the beginning of lecture on Friday, February 21st. Solve the following problems from Chapters 6 and 7, Shigley's Mechanical Engi
Chapter 11
11-1
For the deep-groove 02-series ball bearing with R = 0.90, the design life x D , in multiples
of rating life, is
L
60D nD 60 25000 350
xD D
525 Ans.
LR
L10
106
The design radial load is
FD 1.2 2.5 3.0 kN
1/3
Eq. (11-6):
525
C10 3.0
1/1.4
Chapter 8
Note to the Instructor for Probs. 8-41 to 8-44. These problems, as well as many others in this
chapter are best implemented using a spreadsheet.
8-1
(a) Thread depth= 2.5 mm Ans.
Width = 2.5 mm Ans.
d m = 25 - 1.25 - 1.25 = 22.5 mm
d r = 25 - 5
Chapter 10
10-1
From Eqs. (10-4) and (10-5)
KW K B
4C 1 0.615 4C 2
4C 4
C
4C 3
Plot 100(K W K B )/ K W vs. C for 4 C 12 obtaining
We see the maximum and minimum occur at C = 4 and 12 respectively where
Maximum = 1.36 % Ans.,
and Minimum = 0.743 % Ans.
_
ME 452 - Machine Design II
Name of Student:_
Spring Semester 2016
Lecture Division Number:_
Project 1. Due at the beginning of lecture on Monday, February 1st.
A formal report is not required for this project. The solution must be presented on engineering
ME 452 - Machine Design II
Name of Student:_
Spring Semester 2016
Lecture Division Number:_
Homework No. 1 (50 points). Due at the beginning of lecture on Friday, January 22nd.
Important notes for homework assignments (applicable to all homework this seme
ME 452 - Machine Design II
Name of Student:_
Spring Semester 2016
Lecture Division Number:_
Homework No. 9 (50 points). Due at the beginning of lecture on Monday, April 4th.
Solve the following problems from Chapter 10, Shigleys Mechanical Engineering Des
ME 452 - Machine Design II
Name of Student:_
Spring Semester 2016
Lecture Division Number:_
Homework No. 11 (50 points). Due at the beginning of lecture on Monday, April 18th.
Solve the following problems from Chapter 8, Shigleys Mechanical Engineering De
ME 452 - Machine Design II
Name of Student:_
Spring Semester 2016
Lecture Division Number:_
Homework No. 10 (50 points). Due at the beginning of lecture on Monday, April 11th.
Solve the following problems from Chapter 8, Shigleys Mechanical Engineering De
Name of Student: _
(Last) (First)
Class Time (circle one): 7:30 11:30 2:30
ME 452: Machine Design 11
Fall Semester 2014
Class Test 1-Division—3 (2:30). Friday, September 19, 2014
- OPEN BOOK. CLOSED NOTES.
For full credit please show all your work includi
n . \
Name of Student: S C3 \ 0* U“
(Last Name First Name)
Class Time (circle one): 7:30 11:30 2:30
ME 452: Machine Design II
Fall Semester 2014
Class Test 1c. Friday, October 10, 2014.
OPEN BOOK. CLOSED NOTES.
For Full credit show all of your work, inclu
Name of Student: M
Last First
Class Time (circle one): 7:30 11:30 2:30
ME 452: Machine Design 11
Fall Semester 2014
Class Test 3 - November 7, 2008
OPEN BOOK. CLOSED NOTES.
For Full credit show all of your work, including complete free-body diagrams.
Prob
ME 452: Machine Design II
Spring Semester 2016
Instructor: Professor Gordon R. Pennock
ME 3003F (494-5728), email: pennock@ecn.purdue.edu
Office Hours: M &W 11:00 am 12:00 pm
Lectures: Division 1
MWF 9:30 am 10:20 am
Room: ME 1061
Division 2
MWF 1:30 pm 2
ME 452 - Machine Design II
Name of Student:_
Spring Semester 2016
Lecture Division Number:_
Project 3. Due at the beginning of lecture on Monday, April 25th. A formal report is not required.
Design the spur gears that would be suitable for a commercial 3-