MEEG 304 Machine Design – Elements
Spring Semester 2002
2000-2001 Catalog Data:
Credit 3
Aspects of machine design: statistical nature, theories of failure and design for strength and design of machine
elements. PREREQ: MEEG215.
Textbook:
Required: R.L. Norton, Machine Design: An Integrated Approach, 2nd edition, Prentice-Hall,
2000.
References:
J.E. Shigley & C.R. Mischke, Mechanical Engineering Design, 6th edition, McGraw Hill,
2001 - (another common overview text); and
U. Hindhede, J.R. Zimmerman, R.B. Hopkins, R.J. Erisman, W.C. Hull, & J.D. Lang,
Machine Design Fundamentals: A Practical Approach, John Wiley & Sons, 1983 - (text
for 2-year technology program), and
Baumeister, Marks' Standard Handbook for Mechanical Engineers, McGraw Hill, (or any
basic ME handbook), and
W.C. Young, Roarke's Formulas for Stress & Strain, McGraw Hill, - (another useful
resource).
Coordinator:
Dick J. Wilkins, Ph.D., Professor of Mechanical Engineering
Goals:
The primary objective of this course is to understand how engineering design uses the many principles learned in
previous engineering science courses and to begin to learn how these principles are practically applied. The
emphasis in this course is on machine design: the design and creation of devices that consist of interrelated
components used to modify force and/or motion. Along with traditional "one-answer" homework problems, the
students will be presented with design challenges.
The type of design addressed in this course is that of detailed design, which is only one part of the entire design
process. In detailed design, the general concept, application and basic outline of the required device have already
been designed. In this course, one is not trying to invent a new device but rather to define the shape, size and
material of a particular machine element such that it will not fail under the expected load and operating conditions.
The focus in this course is primarily on the stress-life approach.
By the end of the course, each student should be able to:
 Quantify the statistical meaning of tolerances;
 For a particular sub-set of machine elements and a given problem:
 Define failure,
 Decide on an appropriate failure model, and
 Design an appropriate machine element using:
 Allowable load (under the given operating conditions),
 Required element life, and
 Manufacturing considerations;
 Apply those same concepts to more open-ended problems.
Prerequisites by topic:
3,4.
MEEG 215 Strength of Materials
Topics:
1.
2.
3.
4.
5.
Introduction of engineering economics and review of design process
Statistical nature of properties
Static failure review
Fatigue failure review
Shafts
6.
7.
8.
9.
10.
Lubrications and bearings (fluid-film and rolling element)
Spur gears
Springs
Fastening
Design process (project)
Computer usage:
Engineering drawings required for Project 1
Analysis tools required for Project 2
Oral – Written Communication:
Written project memos & reports are required.
Design:
Project 1: Each team (~two students per team) must hand in sketches of an assembly (of at least two pieces per team
member) that they will make; each team member must be responsible for a Plexiglas pin (lathe) and Plexiglas plate
(mill). Report 1 will include sketches for the components to be fabricated, a list of material required, the steps
required to manufacture each component, an estimate of the time required for each manufacturing operation and an
estimate of the total production time. Students will manufacture their own pin. However, for the plate parts,
drawings will be exchanged and each student will be required to manufacture the team member's part. Report 2
which will include the assembly itself, a drawing package, an explanation/justification of the processes used to
produce your parts, the actual times spent on each manufacturing operation and a summary explaining any
differences between the drawings and parts as well as any differences between the estimated and actual
manufacturing times.
Project 2: The class will be broken into teams of three or four and will also be given a set of project problems.
Teams must identify their top three projects and projects will be paired with the teams. There will be three milestone
events associated with the project. 1st report = define the design problem chosen and list the customers (end users)
and their wants; describe the system requirements and indicate the machine elements comprising the system; from
the problem definition, derive required load and life for the machine elements in the system; discuss the number of
systems to be manufactured as well as any manufacturing and/or assembly issues to be considered in the design. 2 nd
report = present a set of engineering specifications for the required solution derived from the customer wants;
present at least three solutions and use your engineering specifications to choose the best system; synthesize and
design the critical element(s) of your best solution; report will include the following analysis: life (number of cycles)
with load for each critical element, strength analysis leading to sizing and/or selection of critical components,
engineering drawings, photo-copied web or catalog pages identifying chosen components. Specific consideration
should be given to manufacturing and/or assembly requirements, especially in the development of the engineering
specifications and the design of the critical elements. 3rd report = synthesize, design and integrate remaining
machine elements and present the system solution as a whole; provide the reasoning and analysis justifying the
design of each machine element (e.g., for a shaft: present the ultimate & yield strengths and corrected endurance
limit plus the critical location and then that location’s max & min of moment, torque and axial loads plus resulting
diameter; for a bearing: present axial, radial load, required life, maximum speed and then the chosen bearing and its
bore and dynamic load rating; for bushings: give the expected rise in temp; etc.). To receive full credit for this
project, the final report must contain some actual concept verification or preliminary prototyping. This can involve
tests used to make design decisions through working models of major components or sub-systems.
Prepared by: Dick Wilkins
Date: 31 January 2002