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