Hang Tight TEAM REMAKE Kelsey Barrera Mitch Reid Rishi 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 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 The first bicycle that used a chain was invented in 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 bike chains Problem Justification Product Pricing
Survey Data – Target Market Information Age Groups 14 and under 15 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 designs No restraints All ideas welcome Build off team members’ ideas for best preliminary designs
Research Why do bike chains fall off? Decreased tension makes the chain loose Misalignment of the chain and sprockets Does not mean a bike cannot 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 chain Patent
Existing Solutions Chain catcher for bicycles Does not prevent chain from falling Patent
Existing Solutions Motorized bike with gear and chain cover Patent
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 ConstraintWeightDesign 1Design 2Design 3Design 4 Ease of Use51525 Aesthetics21534 Functionality52444 Material31123 Cost41123 Feasibility31143 Adaptability41115 Total
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 ConstraintWeightDesign 1Design 2Design 3Design 4Design 5 Ease of Use Aesthetics Functionality Material Cost Feasibility Adaptability Total
Material Selection Matrix SpecificationWoodPlasticSteelCardboardFoamAluminum Durability Cost Machinability Availability Aesthetics Total
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 Arm Wheel Base Create new piece Attachment Piece New Material ABS Plastic
Third Prototype ABS Plastic Rapid Prototyping Machine
Prototype with bike
Test Results and Evaluation Duration Test completed Passed Chain Alignment Test completed Passed Other tests still to be determined
Third Prototype - Problems Plastic is layered Easier to break
Refinements New material Steel Aluminum New elastic Design is still the same
Final Product
Summary?????
Questions? Thank you