The Great Team 1 Week 10 : Prototype Review Bunk Bed Converter Adam Brown Blaine Gardner Sarah Gleaton Jimmy Jiang Addisu Lemlem Lee Tschaepe 7/19/2006
Week 10 : Prototype Review
Jan 12, 2016
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. - PowerPoint PPT Presentation
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The Great Team 1
Week 10 : Prototype ReviewBunk Bed Converter
Adam BrownBlaine GardnerSarah GleatonJimmy Jiang
Addisu Lemlem
Lee Tschaepe
7/19/2006
The Great Team 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
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