ME 3671 Exam 1 Take Home Component
Due Feb 8 (in class)
You are allowed to work in teams of up to 4 people. This component of the exam is an open ended design. There is
no unique correct answer. You must turn the exam in within 48 hours (in class on Frida
ME 3671 Design Project
South Pointing Chariot
Fall 2016
i
Abstract
The motivation behind this project was to create a fun and interactive machine to encourage and
teach young people about different types of machine elements and how they interact with each
Flexible Elements
Chapter 17
Belts Advantages and Disadvantages
Positives:
1. One of the best power to weight ratios (but less than chains).
2. Almost the efficiency of gearing. (>98%)
3. Good solution when transmitting torque over a long distance.
4. Rel
Roller Chains
Term project
Meetings (next Wednesday during class and office
hours). Schedule in Carmen Discussion
Copy paste a time slot, put your team name in, and
add it to the discussion. (15 groups, 18 slots)
Please check that you do not select a time
3671 Design Project Final Report Guidelines- Fall 2016
Final Reports are Due by 5:00pm on Dec 7, 2016
The final report must be well written and devoid of all grammatical errors. It should be double
spaced with 1-inch margins except on the left-hand side,
Bearings Review
Chapter 11
Anti-friction bearings
Plain bearings
(bushings)
Some Bushing Geometries
Solid
Grooved
Oil Hole
Flanged
Grooved
Plugged
Sizing of Bushings
1. There is a maximum sliding velocity, V,
which cannot be exceeded.
2. There is a maximu
Stages in solving a problem in science and engineering
I
Formulation:
Physical problem is represented by a model. The model is a
reduced representation of the actual problem that (hopefully)
retains the correct physical phenomena and associated
mathemati
ME 3671 Design and Analysis of Machine Elements II
Spring Semester, 2017
Instructor: Dr. Robert Siston
Office: E305 Scott Laboratory
E-mail/Twitter: siston.1@osu.edu , @ProfSiston Phone: 247-2721
Office Hours: Tuesdays 1:00 2:30 p.m., Wednesdays 3:00 4:30
ME 3671 Spring 2017: Homework 1
Due Monday January 23, 2017
1. An existing helical-coil compression spring is wound from unpeened
music wire with a diameter of d= 0.105. The mean diameter of the
spring is D = 0.80 as shown. The applied load fluctuates bet
ME 3671 Fall 2015: Homework 2 Solutions
1. A short shoe brake consists of a 10 diameter drum
and an actuation arm configured as shown. The shoe
is molded fiberglass, the drum is aluminum-bronze,
and the entire assemble is water-sprayed. The
coefficient of
ME 3671 Fall 2015: Homework 3 (Spur Gears)
1. Two shafts 7.50 inches apart are connected by spur
gears A and B making external contact. Gear A rotates at
1150 rpm and gear B rotates at 350 rpm. The diametral
pitch of the gears is 6 and the teeth are 20 de
CSE 2321 Foundations I Autumn 2016 Dr. Ilin
Homework 5 Due: Tuesday, Nov 1, 2016 (50 point)
1. (10 points) A path in a graph is called simple if all of its vertices are distinct. In
the graph depicted below, how many simple paths are there from v to w? Ju
CSE 2321 Foundations I Autumn, 2016 Dr. Ilin
Homework 4
1. (10 points) Consider the Cartesian product of sets. Does it distribute over set
intersection? Over set union? Prove your answer.
Start with the definition of Cartesian product. For set union, use
CSE 2321 Foundations I Autumn, 2016 Dr. Ilin
Homework 3 solutions
1. Let A = cfw_a, b, c and B = cfw_b, d, f. Well write POW(S) to denote the
power set of a set S.
(a) What is
SOLUTION:
?
, b
(b) What is
?
SOLUTION: 32 2 5
(a) What is
SOLUTION:
2
3
?
CSE 2321 Foundations I Autumn 2016 Dr. Ilin
Homework 3 Due Thursday, Sep 22, 2016
1. (10 points) Let A = cfw_a, b, c and B = cfw_b, d, f. Well write POW(S) to denote the power set
of a set S.
(a)
What is
(b)
What is
(c)
What is
?
?
?
2. (10 points)Determi
CSE 2321 Foundations I Autumn 2016 Dr. Ilin
Homework 1-Due Sep 1
1. (10 points) For each of the following propositions (also known as
Boolean expressions), prove, by means of a truth table, whether it is a
tautology (i.e., its always true), a contradictio
CSE 2321 Foundations I Autumn, 2016 Dr. Ilin
Homework 6 Due: Thursday, Nov. 10 (50 points total)
1. (10 points) Answer true or false, with justification:
(a) If an undirected graph G has exactly three vertices of odd degree then
G must have an Eulerian ci
page 1 of 4
CSE 2321 Foundations I Autumn 2016 Dr. Ilin
Homework 2 due Sep 13
1. (10 points) Let x be the set of all cars is the world.
Let C(x) be the predicate x is a Corvette.
Let P(x) be the predicate x is a Porsche.
Let F(x) be the predicate x is a F
CSE 2321 Foundations I Autumn, 2016 Dr. Ilin
Homework 4 Due Sep 29, 2016
1. (10 points) Consider the Cartesian product of sets. Does it distribute over set
intersection? Over set union? Prove your answer.
2. (10 points) Start with the formal definition of
ME 3671 Fall 2016: Homework 2 Solutions
1. A short shoe brake consists of a 10 diameter drum
and an actuation arm configured as shown. The shoe
is molded fiberglass, the drum is aluminum-bronze,
and the entire assemble is water-sprayed. The
coefficient of
ME 3671 Spring 2016: Homework 1 Solutions
1. d= 0.105, D=0.80, Pmax= 25lb, Pmin= 0lb, Nd=107
cycles
c=D/d=7.619
Sut= Bda=184,600(0.105)-.1625=266.2 ksi
From Table 14.8 for steel under released loading at 107
cycles
( )
f 10 7
Sut
= 0.38 ( f )107 = Sse = (
MISCELLANEOUS SPRINGS
Miscellaneous Springs
Beleville Springs
The force required to flatten a
Belleville spring is
F flat
4 E ht 3
2
2
1 K1D0
where - Poisson's ratio
E - Elastic modulus
D0 - Outside washer (spring) diameter
Di - Inside washer (spring) d
LEAF AND TORSION SPRINGS
Leaf Springs
Leaf springs are typically modeled as
cantilevered beams with an end load
applied. The principal relations used are
those for flexure stress and end deflection
(related to spring rate).
Mc
P
and k
I
Leaf Springs
Leaf
TENSION SPRINGS
Tension Springs
The analysis of tension springs parallels that of compression
springs. Additional consideration are however required. These
considerations are a result of the end loops. The maximum shear
stress due to torsion is still expr
SPRINGS
Springs
Mechanical springs are elastic members whose primary function is
to exert force or torque and to store or absorb elastic energy
Major types (subsets of the springs defined above) are found in
Figures 14.1 14.3
Springs
Pogo Stick Compressio
ME 3671
Design and Analysis of Machine
Elements II
3671 Introduction and Overview
Background:
ME 3671 evolved from a combination of 562 and 563.
In the conversion to semesters we have retained all of ME 562 and
563 (the content of ME 563 and those compone
ME 3671 Take Home Exam 3 Due by 10:00 am Wednesday April 10 (outside your instructors office)
A commercial gearbox designed for lightweight
robots (< 150 lbs) uses 2 motors to drive two 14
tooth pinions with a diametral pitch of
Pd = 32 (gear 1 in the fig
ME 3671 Take Home Exam 3
A commercial gearbox designed for lightweight
robots (< 150 lbs) uses 2 motors to drive two 14
tooth pinions with a diametral pitch of
Pd 32 (gear 1 in the figure shown). Gar 2 is a
50 tooth gear. Another 14 tooth gear (gear 3) is
ME 3671 Exam 1 Take Home Component
Due Feb 8 (in class)
You are allowed to work in teams of up to 4 people. This component of the exam is an open ended design. There is
no unique correct answer. You must turn the exam in within 48 hours (in class on Frida
Brake Mount
Gearbox Pad
Brake Caliper (Wilwood 4- piston)
Rotor
Rigid mount
Brake Rotor (4340 or carbon steel)
Piston
Pad
Blanchard ground finish
One- or two- piece design
Top Hat (6061 AL)
Vented for cooling
Pilot Diameter
Gearbox output
Grease- packed B