1. Hang Tight TEAM REMAKE Kelsey Barrera Mitch Reid Rishi Savaliya

2. 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

3. 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.

4. Define the Problem Statement of Purpose Create a product that will prevent the chain from falling off the gear of a bicycle.

5. Gantt Chart

6. Survey Survey Population: 145 Goals of conducting our survey  Target Market Information  Multiple causes of falling bike chains  Problem Justification  Product Pricing

7. Survey Data – Target Market Information Age Groups  14 and under  15 to 25 Ride bikes average of 1 to 5 times a week

8. Survey Data – Causes for Faulty Chains

9. Survey Data – Problem Justification

10. Survey Data – Product Pricing

11. 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

12. 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

13. 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

14. Existing Solutions Drive-shaft driven bicycle  Eliminates chain Patent 5078416

15. Existing Solutions Chain catcher for bicycles  Does not prevent chain from falling Patent 5184984

16. Existing Solutions Motorized bike with gear and chain cover Patent 6591929

17. Group Solutions Design 1

18. Design 2

19. Design 3

20. Design 4

21. Criteria and Constraints Easy to use Aesthetics Functionality Material Cost Feasibility Adaptability

22. Select an Approach ConstraintWeightDesign 1Design 2Design 3Design 4 Ease of Use51525 Aesthetics21534 Functionality52444 Material31123 Cost41123 Feasibility31143 Adaptability41115 Total-316966103

23. Develop a Design Proposal Created a Build Process Completed a material and cost analysis Created technical drawings for final concept

24. First Prototype Foam

25. 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

26. Sketch 5

27. Design Matrix ConstraintWeightDesign 1Design 2Design 3Design 4Design 5 Ease of Use515255 Aesthetics215345 Functionality524445 Material311234 Cost411234 Feasibility311435 Adaptability411155 Total-316966103123

28. Material Selection Matrix SpecificationWoodPlasticSteelCardboardFoamAluminum Durability345215 Cost531551 Machinability552552 Availability553543 Aesthetics455115 Total22 161816

29. Second Prototype Wood

30. 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

31. Test Results and Evaluation Wooden prototype passed all tests

32. 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

33. Refinements Change dimensions  Arm  Wheel  Base Create new piece  Attachment Piece New Material  ABS Plastic

34. Third Prototype ABS Plastic Rapid Prototyping Machine

35. Prototype with bike

36. Test Results and Evaluation Duration Test completed  Passed Chain Alignment Test completed  Passed Other tests still to be determined

37. Third Prototype - Problems Plastic is layered  Easier to break

38. Refinements New material  Steel  Aluminum New elastic Design is still the same

39. Final Product

40. Summary?????

41. Questions? Thank you