hang tight
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Rishi Savaliya, Mitch Reid, Kelsey Barrera. Hang Tight. Define the Problem Time Management Survey Brainstorming Research Donation Letters Existing Solutions Group Solutions Selecting an Approach First Prototype Second Prototype. Agenda. Third Prototype Test Procedures - PowerPoint PPT PresentationTRANSCRIPT
HANG TIGHTRishi Savaliya, Mitch Reid, Kelsey Barrera
AGENDA Define the Problem Time Management Survey Brainstorming Research Donation Letters Existing Solutions Group Solutions Selecting an Approach First Prototype Second Prototype
Third Prototype Test Procedures Test Results and
Evaluation Refinements
DEFINE THE PROBLEMProblem Statlement
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.
GANTT CHART
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
EXISTING SOLUTIONS Drive-shaft driven bicycle
Eliminates chainPatent 5078416
EXISTING SOLUTIONS Chain catcher for bicycles
Does not prevent chain from falling
Patent 5184984
EXISTING SOLUTIONS Motorized bike with gear and chain
coverPatent 6591929
GROUP SOLUTIONS Design 1
GROUP SOLUTIONS Design 2
GROUP SOLUTIONS Design 3
GROUP SOLUTIONS Design 4
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
FIRST PROTOTYPE Foam
FIRST PROTOTYPE – PROBLEMS Too large for bike Wheels on prototype don’t align Not a good material Very hard to construct Arms too far from base
NEW DESIGN Design 5
DESIGN MATRIXConstraint 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
MATERIAL SELECTION MATRIXSpecification 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
SECOND PROTOTYPE Wood
BILL OF MATERIALS – SECOND PROTOTYPE
Item Quantity Specifications PriceWood 1 2" X 4" X 2' $ 1.98
Screws with Bolts 2 packs of 3 1/4" 20 $ 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
TEST RESULT AND EVALUATION Wooden prototype passed all tests
SECOND PROTOTYPE – PROBLEMS Lots of broken parts
Very close to wheel
Very close to pedal
REFINEMENTS Redo dimensions
Arm Wheel Base
Create new piece Attachment Piece
New Material ABS Plastic
THIRD PROTOTYPE ABS Plastic
THIRD PROTOTYPE Prototype with bike
BILL OF MATERIALS – THIRD PROTOTYPE
Item Quantity Specifications PriceScrews and
Bolts 2 packs of 3 1/4" 20 $1.49 per pack
Rubber Bands A ball of themMultiple sizes and strengths Pre-owned
Plastic ABS Plastic
Total - -
TEST RESULT AND EVALUATION Duration test completed
Passed Chain alignment test completed
Passed Other tests still to be determined
THIRD PROTOTYPE – PROBLEM Plastic is layered
Easier to break
REFINEMENTS New material
Steel Aluminum
New elastic Design is still the same
FINAL PRODUCT
SUMMARY
QUESTIONS?
THANK YOU