rishi savaliya, mitch reid, kelsey barrera team remake
TRANSCRIPT
AGENDA
Define the Problem Time Management Survey Brainstorming Research Donation Letters Existing Solutions Group Solutions Criteria and
Constraints
Select an Approach Design Proposal Material Selection First Prototype Second Prototype Third Prototype Final Product Summary
DEFINE THE PROBLEM
Problem Statement
According to the US Department of Transportation’s National Highway Traffic Safety Administration (NHTSA), approximately 57 million people in the United States rode a bicycle in the year 2002. The first bicycle that used a chain was invented in 1885. This resulted in the problem of bicycle chains falling off the gears. In a class of 27 students, 20 agree that bicycle chains falling is a problem that occurs very often and should be solved.
DEFINE THE PROBLEM
Statement of Purpose
Create a product that will prevent the chain from falling off the gear of a
bicycle.
SURVEY
Survey population: 145
Goals of conducting our survey Target Market Information Multiple causes of falling bicycle chains Problem Justification Product Pricing
SURVEY DATA – TARGET MARKET INFORMATION
Age groups: 14 and under 15 to 25
Ride bikes on average of 1 to 5 times weekly
SURVEY DATA – CAUSES FOR FAULTY CHAINS
15%
38%
4%
19%
24%
1%
Why Do You Ride Your Bicycle
No Answer Leisure/Hobby
Competition Transportation
Exercise Other
SURVEY DATA – PROBLEM JUSTIFICATION
88%
12%
Have You or Someone You Know Experienced Chain Prob-
lems?
Yes No
69%
20%
3%3%
6%
How Often Has This Problem Occurred?
1 to 2 Times a Year
1 to 2 Times a Month
1 to 2 Times a Week
More Often Than That
No Answer
13%
18%
55%
3%4% 7%
What Was Done To Fix Prob-lem?
Nothing
Take To Bicycle Shop
Fixed By Self
Disposed Of Bicycle
Other
No Answer
SURVEY DATA – PRODUCT PRICING
37%
26%
28%
10%
How Much Would You Pay For A Solution?
$0.01 - $3.99
$4.00 - $7.99
$8.00 - $11.00
More Than $11.00
BRAINSTORMING
Determine what specifically causes chains to fall off
Create possible designs No restraints All ideas welcome
Build off of team member’s ideas for best preliminary design
RESEARCH
Why do bike chains fall off? Decreased tension makes chain loose Misalignment of chain and sprocket
Does not mean that bike can not be used
DONATION LETTER
Explained reason for writing Asked bike manufacturers to donate
bikes Schwinn Mongoose/Pacific Cycle Trek Bicycle Raleigh America Inc. Cannondale Bicycle Corp.
Benefits to companies for contributions
CRITERIA AND CONSTRAINTS
Easy to use Aesthetics Functionality Material Cost Feasibility Adaptability
SELECT AN APPROACH
Constraint Weight Design 1 Design 2 Design 3 Design 4
Ease of Use 5 1 5 2 5
Aesthetics 2 1 5 3 4
Functionality 5 2 4 4 4
Material 3 1 1 2 3
Cost 4 1 1 2 3
Feasibility 3 1 1 4 3
Adaptability 4 1 1 1 5
Total - 31 69 66 103
DEVELOP A DESIGN PROPOSAL
Created a build process
Completed material and cost analysis
Created technical drawings for concept
MATERIAL SELECTION MATRIX
Specification Wood Plastic Steel Cardboard Foam Aluminum
Durability 3 4 5 2 1 5
Cost 5 3 1 5 5 1
Machinability 5 5 2 5 5 2
Availability 5 5 3 5 4 3
Aesthetics 4 5 5 1 1 5
Total 22 22 16 18 16 16
FIRST PROTOTYPE – PROBLEMS
Too large for bike Wheels did not align with chain Not a good material Difficult to construct Arms were weak and had little support
DESIGN MATRIX
Constraint Weight Design 1 Design 2 Design 3 Design 4 Design 5
Ease of Use 5 1 5 2 5 5
Aesthetics 2 1 5 3 4 5
Functionality 5 2 4 4 4 5
Material 3 1 1 2 3 4
Cost 4 1 1 2 3 4
Feasibility 3 1 1 4 3 5
Adaptability 4 1 1 1 5 5
Total - 31 69 66 103 123
SECOND PROTOTYPE – BILL OF MATERIALS
Item Quantity Specifications Price
Wood 1 2" X 4" X 2' $1.98 Screws with
Bolts 2 packs of 3 1/4" – 20 x 3” $1.49 per pack
Rubber Bands A ball of themMultiple sizes and strengths Already Owned
Total - - $4.90
TEST PROCEDURES
Chain Alignment Chain must stay aligned with prototype
wheels Drop Test
See effect of various riding terrains on prototype
Durability Test Chain stays aligned for a given period of
time Rider Interference
Prototype cannot prevent rider from pedaling properly
SECOND PROTOTYPE – PROBLEMS
Many broken pieces Placement too close to wheel Interfered with pedal Grooves of base block too large for arm
piece Grooves of wheel too shallow
SECOND PROTOTYPE - REFINEMENTS
Change dimensions Arm Wheel Base
Create new piece Attachment Piece
New Material ABS Plastic
THIRD PROTOTYPE - BILL OF MATERIALS
Item Quantity Specifications PriceScrews and
Bolts 2 packs of 3 1/4” – 20 x 3” $1.49 per pack
Rubber Bands A ball of themMultiple sizes and strengths Pre-owned
Plastic 10.7 ABS Plastic $53.50
Total - - $56.48
SUMMARY
Problem Statement Prevent bicycle chain from falling off gears
Product compatible with single-speed bikes
Adaptable to different bike frame thicknesses
Meets the standards of criteria