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Week 10 : Prototype Review. Bunk Bed Converter Adam Brown Blaine Gardner Sarah Gleaton Jimmy Jiang Addisu Lemlem Lee Tschaepe. 7/19/2006. Parts Completed Cutting The Post. Parts Completed Welding The Post. Parts Completed Grinding The Weld. Problems Encountered. Frame and Mattress.
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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
Parts CompletedCutting The Post The Great Team
Parts CompletedWelding The Post The Great Team
Parts CompletedGrinding The Weld The Great Team
Problems Encountered The Great Team
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
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
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
Helical Spring The Great Team
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