Engr 170 CDP by jizhen1947

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									Problem Definition
 Shovel design hasn’t improved with other
 technologies in the roofing industry.
 -Inefficient
Criteria
 - Safety

 - Efficiency

 - Cost

 - Portability
Constraints

- Weight

- Size

- Stability
Basic Stripper
            -Man Powered
            -Width
            -Lever
The Flipper

         -Electric Powered
         -Linear Actuators
The Jackhammer
 -Air Pneumatic
 -Self-Propelled
Mega-Magnet




 -Electric Powered
 -Dual Linear Actuators
The Ripper
 -Gas Motor
 -Hydraulic
The Tank

 -Tracks
 -Size
The Crawler
-Powered by a Lawnmower
Engine
-Consists of Three Magnets
     (Revolve about an Axel)
          -Chain Driven
Decision Matrix
                                  Decision Rankings



              The Flipper, 710,   Basic Stripper, 760,   Basic Stripper
                   14.8%                 15.9%           Mega Magnet Stripper
          The Jackhammer,              Mega Magnet       The Tank
            650, 13.6%                 Stripper, 800,    The Revolver
                                           16.7%
         The Shredder, 650,                              The Shredder
                                    The Tank, 540,       The Jackhammer
               13.6%
                   The Revolver, 680, 11.3%
                                                         The Flipper
                         14.2%




  - Calculated by multiplying score and weight
  - Well balanced, score of eight for all criterion
  - High score by forty points
  - Fair way to evaluate all potential ideas
Solution
Mega-Magnet had best overall design.
Conclusion
By eliminating the paradigms that we had
 been previously constrained by, our team
 was able to envision many designs that
 most professionals would not have
 considered. By applying new technologies
 to an old process, we were able to come
 up with a new innovative machine that
 could entirely transform the modern day
 roofing industry.
References
– http://dailymag.en.alibaba.com/product/50119515/51070825/Magnetic_Assem
  blies/Powerful_Handle_Magnets.html
– www.apawood.org/pdfs/unmanaged/WCTENailWithdrawal.pdf
– http://www.mcmaster.com/
– www.globalspec.com
– http://www.turtlesoft.com/Goldenseal-Software-Reference/constroof.htm
– http://lawn-and-garden.hardwarestore.com/83-528-roofer''s-shovels/pro-d-
  handle-wood-roofing-shovel-653654.aspx
– Interview with ISU Professor Mani Mina of Applied Electromagnetism
– Phone interview with Jim, an Electromagnetics Engineer from BOMAG USA
– Interview with ISU Professor Jiming Song of Computational Electromagnets
– Interview with Richard Owens (professional roofer for 50 years)

								
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