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Team Short Bus “That’s how we roll.” 3/8/2006

Team Short Bus “That’s how we roll.” 3/8/2006. Team Members: Michael Harrison…………………Team leader Caleb Monk……………………Media Manager Will Moore…………………………..Webmaster James Nishimuta……Shop/Machine Manager Clint Perry…………………CAD/FEA Engineer Alex Podust…………….Engineering Manager. Last Week:.

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Team Short Bus “That’s how we roll.” 3/8/2006

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  1. Team Short Bus“That’s how we roll.”3/8/2006 Team Members: Michael Harrison…………………Team leader Caleb Monk……………………Media Manager Will Moore…………………………..Webmaster James Nishimuta……Shop/Machine Manager Clint Perry…………………CAD/FEA Engineer Alex Podust…………….Engineering Manager

  2. Last Week: • Midterm Presentation Review • Design Layout

  3. This Week • Design Layout • Engineering Analysis • Areas prone to failure • Potential engineering/manufacturing problems • Estimate basic features (weight/size) • Should also address material analysis for fasteners, stability during operation, human interface, safety, tolerance, material selection

  4. Design Layout

  5. Areas Prone to Failure • Support member and teeth • Release mechanism • Support Flange

  6. Potential Engineering/Manufacturing Problems • Latch complexity • Handle/cable interface size/location/method of attachment

  7. Engineering Estimations • Jack Flange • Support Member • Support Member Teeth • Latch • Disengagement • Release mechanism

  8. Jack Flange • Safety Factor: 3 • Material: 1045 cold rolled steel • Load: 15569 N (3500 lbs) • Load condition: Bending • Length: 0.1 m • Width: 0.1 m • Thickness: 0.025 m

  9. Support Member (S.F. = 3.9) • Rectangular cross section • Load: 15569 N (3500 lbs) • Load condition: Compression • Length: 0.3048 m (12 in.) • Width: 0.0381 m (1.5 in.) • Height: 0.0254 m (1 in.) • Max load due to angle: 89658 N • No buckling anticipated by l/h ratio

  10. Support Member Teeth (S.F. = 12.7) • Material: 1045 cold rolled steel • Load: 15569 N (3500 lbs) • Load Condition: Bending and Shear • Depth: 0.00635 m (0.25 in.) • Width: 0.0254 m (1 in.) • Height: 0.0254 m (1 in.) • Tensile Yield Strength: 530 MPa • Shear Yield Strength: 306 MPa • Actual Shear stress: 24.1 MPa

  11. Latch (S.F. = 3) • Model: rectangle beam, 2 force member • Material: 1010 Steel Cold Drawn • Load: 15569 N (3500 lbs) • Load Condition: Bending • Arm Length: 0.05 m • Latch Rotation: 30 degrees • Min A_cs: 1.53E-04 m^2 • Min pin A_cs: 1.71E-04 m^2

  12. Disengagement • Material: Steel Bicycle Cable • Yield Stress: 140 GPa • Handle displacement: 0.0127 m (0.5 in) • Torque spring: 22.24 N (5 lbs) • X2_max: 0.01905 m (0.75 in.) • Support Member Weight:17.79 N (4 lbs) • Disengagement force: 14.27 N (3.208 lbs)

  13. Release Mechanism (S.F. = 3) • Four Handle pins • Force on Pin: 800 N (180 lbs) • Length: 0.0254 m (1 in.) • Diameter: 0.0064 m (0.25 in.) • Pin constraint • Pin diameter must be less than a third of the diameter of the handle, so must be less than 0.5 in. • Constraint OK

  14. Release Mechanism (cont’d) • PVC Pipe • Inner Diameter: 0.0381 m (1.5 in.) • Outer Diameter: 0.0445 m (1.75 in.) • Length of Tube: 0.9144 m (36 in.) • Force on Tube: 108045 Pa (15.7 psi) • Compressive strength: 9600 psi (7800 lb)* • Weight: .528 kg (1.16 lb) *specific to given geometry

  15. Next Week: • Complete set of part drawings for actual design • Description of part drawings ready for manufacture • Subassembly layout drawings ready for manufacture

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