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Week 10 : Prototype Review

In our Week 10 prototype review, the Great Team presents a comprehensive analysis of the bunk bed converter's design and performance. Key achievements include cutting, welding, and grinding the frame, which weighs 25 lbs, while the mattress weighs 50 lbs. We explored torque calculations critical for balancing forces across the structure. Each arm must support ¼ of the total weight, generating significant torque. Furthermore, spring calculations demonstrated the required lifting force and torque specifics, aiding in testing the user-friendly aspects of our innovative design.

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Week 10 : Prototype Review

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  1. Week 10 : Prototype Review Bunk Bed Converter Adam Brown Blaine Gardner Sarah Gleaton Jimmy Jiang Addisu Lemlem Lee Tschaepe The Great Team 7/19/2006

  2. Parts CompletedCutting The Post The Great Team

  3. Parts CompletedWelding The Post The Great Team

  4. Parts CompletedGrinding The Weld The Great Team

  5. Problems Encountered The Great Team

  6. Frame and Mattress • Frame weighs 25 lbs • Mattress weighs 50 lbs • This force is distributed over 4 arms; each arm must support ¼ of this force. The Great Team

  7. Calculations -Torque due to mattress and frame: (50/4)*41+(25/4)*41=768.755 -Torque due to weight of Pivot Arm: 10.905*(41/2)=223.45 lb-in Total Torque generated for one arm: 992.25lb-in The Great Team

  8. Results • If a torque of 850 lb-in is applied using a torsion spring, the user must lift 3.47 lbs per arm • Total user required force to upper bunk assembly is 13.88 lbs The Great Team

  9. Helical Spring The Great Team

  10. Spring Calculations • Moment arm = 2 in • Spring Displacement = 2.28 in • Torque Generated = 830 in-lbs • Spring Rate = 73.37 lb/in • User Lift Per Arm = 3.96 lbs • Total Required Force to Lift = 15.85 lbs The Great Team

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