Project 2.1.5 Redesign a Protective Case

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School

Harvard University *

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111

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Mechanical Engineering

Date

Feb 20, 2024

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docx

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8

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1. Design statement and Criteria from Design brief (entire sheet not necessary)
2. Concept sketches (unique box concepts- 2 minimum) 3. One sentence justifying your solution path I chose this solution path because the 1/16 pin size fits my hinge.
4. Annotated concept sketch w/ tolerances
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5. 3D solid model of two components (your design) 6. Assembly drawing (exploded view- pins/ lid/ base)
7. Working drawings (Multiview) 9. Proof of concept statement (did your intended improvements work?) The process of printing was problematic, since the first time I printed my 3D printed CAD model, the top hinge was not printed completely so it could not function properly. In addition, the assembly was better than the printing, however it did not allow for the smaller metal pins
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which have a diameter of 1/16 of an inch to fit through, so instead I decided to use a longer 3D printed pin that had a diameter slightly larger than 1/16 of an inch. A. Review the goals you recorded in Step 2 in 2.1.5 (engineering notebook). Did you achieve your goals? Why or why not? Yes, because I now know all the measurements for the new and improved case design. B. Compare this design experience to Project 1.3.7. Was this design process more efficient? Support your assessment with examples. What did you learn in this design experience that can help you improve your design efficiency in the future? Undoubtedly, because on the last one I did not understand the lid of the case and made it incorrectly. I have learned that I need to follow by example to understand what I am doing. C. A design process is meant to be iterative. Explain how you used iteration to improve your design of a protective container. I used iteration to create a new model for a protective case design. D. Why does your current design merit further development? That is, why is this solution worth pursuing? My current design is worth pursuing, because it was able to function correctly this time, and it was worth my time, because I got the chance to reinforce my skills that I learned with assembling things with joints and combine that with my previous knowledge of creating the protective case model back in Project 1.3.7. E. What are your suggested next steps for design iteration that would improve the design? My suggested next steps for design iteration that would improve the design would be to add holes located on the bottom of the container and to find a way to have two small metal pins to fit inside the container and function the same, if not better than it currently is. F. Could you add criteria or constraints to the design brief that would improve your ability to compare potential solutions more effectively? Yes, I could add criteria, such as a longer metal pin with the same diameter as before which was 1/16 of an inch and use the scale tool in Fusion 360 to increase or decrease the size to the maximum size the constraints would allow me to which was 1.5 in.^3.
G. What previous experience(s) (in this class or elsewhere) helped you solve this problem? Explain how your previous learning connected to your learning during this project. My previous experiences with working on the protective case design during Activity 1.3.7 helped me a lot, especially when creating the outer layer and extruding or shelling an object in Fusion 360. In addition, my previous learning on how my hinge mechanism failed last time, and my previous experiences with assembling models in CAD such as the selfie stick holder connected to my learning during this project by either avoiding those mistakes or using the new skills, I learned to assemble the hinge mechanism correctly this time.