hang tight team remake kelsey barrera mitch reid rishi savaliya
TRANSCRIPT
Hang Tight
TEAM REMAKEKelsey BarreraMitch ReidRishi Savaliya
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 Problem
Problem StatementAccording 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 surveyTarget Market InformationMultiple causes of falling bike chainsProblem JustificationProduct Pricing
Survey Data – Target Market Information
Age Groups14 and under15 to 25
Ride bikes average of 1 to 5 times a week
Survey Data – Causes for Faulty Chains
Survey Data – Problem Justification
Survey Data – Product Pricing
Brainstorming
Determined what specifically causes chains to fall off
Create possible designsNo restraintsAll ideas welcome
Build off team members’ ideas for best preliminary designs
Research
Why do bike chains fall off?Decreased tension makes the chain
looseMisalignment of the chain and sprockets
Does not mean a bike cannot be used
Donation Letter Explained reason for writing Asked bike manufacturers to donate
bikesSchwinnMongoose/Pacific CycleTrek BicycleRaleigh America Inc.Cannondale Bicycle Corp.
Benefits to companies for contributions
Existing Solutions Drive-shaft driven bicycle
Eliminates chain
Patent 5078416
Existing Solutions Chain catcher for bicycles
Does not prevent chain from falling
Patent 5184984
Existing Solutions Motorized bike with gear and chain cover
Patent 6591929
Group Solutions
Design 1
Design 2
Design 3
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 a material and cost analysis
Created technical drawings for final concept
First Prototype Foam
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
Sketch 5
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
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
Second Prototype Wood
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 Results and Evaluation Wooden prototype passed all tests
First Prototype - Problems
Many broken pieces Placement too close to wheel Interfered with pedal Grooves of base block too large for
arm block Grooves of wheel too shallow
Refinements Change dimensions
ArmWheelBase
Create new pieceAttachment Piece
New MaterialABS Plastic
Third Prototype ABS Plastic Rapid Prototyping Machine
Prototype with bike
Test Results and Evaluation
Duration Test completedPassed
Chain Alignment Test completedPassed
Other tests still to be determined
Third Prototype - Problems
Plastic is layeredEasier to break
Refinements
New materialSteelAluminum
New elastic Design is still the same
Final Product
Summary?????
Questions?
Thank you