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Telescoping Mast Design Options

Telescoping Mast Design Options. Presented by Doug Eddy, GRA and Dr. Sundar Krishnamurty at UMass Amherst For Hoppe Tool. Lifting Mechanism Design Alternatives. Cables on Pulleys with simultaneous lift Roller Chain on Sprockets Straps on Pins Screw Driven

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Telescoping Mast Design Options

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  1. Telescoping Mast Design Options

    Presented by Doug Eddy, GRA and Dr. Sundar Krishnamurty at UMass Amherst For Hoppe Tool
  2. Lifting Mechanism Design Alternatives Cables on Pulleys with simultaneous lift Roller Chain on Sprockets Straps on Pins Screw Driven Other less proven risky alternatives: Rack and Pinion Linear Motors
  3. Summary of Key Findings Round tubing 21% and 43% better than square for sway limitation. Round tubing 62% and 68% better than triangular for sway limitation. Round tubing size availability for the largest section may pose a constraint. Manufacturable process validated for round tubing. Vehicle acceleration moving camera greater than 3” from rest in 1 second will exceed the 20” sway spec if the total tubing weight is approx 132 pounds. This assumes there are no gaps between the tubes. Aluminum is recommended over stainless steel, because the tubes can be larger with more real estate on the inside.
  4. Concerns and Challenges The 300 pound camera at a fast speed imposes a high tension force on the mechanism components. Can we have simultaneous lifting of all sections w/out mechanisms outside and inside? Is the tension force too high for simultaneous lifting? Keeping all the mechanisms and camera wiring inside the mast poses clearance concerns. Design tradeoff with the dia. size of the pulleys mounted within the bushings. It does not appear likely we can keep the mast weight under 150 pounds, closer to 300 pounds with internal camera wiring. Must keep the tension close to equal on the 2 belts or straps to prevent binding or one side overloading. Maintenance access with internal components with effects of environment, impact, etc.
  5. Evaluation of Pulleys and Cables for Simultaneous Lift
  6. Evaluation of Roller Chain Concept
  7. Evaluation of the Straps on Pins Concept
  8. Evaluation of Screw Drive Concept
  9. Other Design Decisions Internal vs. External Cabling Tube Cross Section Shape Circular Triangular Square
  10. Camera Electrical Wiring Internally Routed Vs. Externally Routed
  11. Cross Section Analysis of Circular Tubing vs. Square or Triangular
  12. Work to be Done 1) Analysis of scaled down proof of design concept prototypes by the students - completed 2) Evaluation of student designs and research of any other possible options - completed 3) Development and/or modification for optimization 4) Identification of Critical Function Features & a Quality Control Plan 5) Design for Manufacturability and Assembly (DFMA) 6) Theoretical Design Validation to enable a prototype build and test at Hoppe Tool 7) Provide support for life testing and subassembly testing for construction 8) Geometric Dimensioning and Tolerance (GD&T) analysis 9) Completion of prints/specifications for manufacturing at Hoppe Tool 10) Provide support for the first Beta Manufacturing Validation Testing build 11) Refinement, modifications and improvements based on results
  13. Project Schedule / Timeline
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