Studio 2 Mechanical Dissection of a Circuit Breaker

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School

Georgia Institute Of Technology *

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Course

2110

Subject

Mechanical Engineering

Date

Feb 20, 2024

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pdf

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Uploaded by ChefRoseWombat20

1 GEORGIA INSTITUTE OF TECHNOLOGY  George W. Woodruff School of Mechanical Engineering ME 2110 - Creative Decisions and Design, Fall 2023 Studio #2 – Mechanical Dissection A circuit breaker is a mechanism that protects an electrical circuit from damage caused by overcurrent/overload or short circuit. Its basic function is to interrupt current flow after protective relays detect a fault. This week you will work in groups of three to four students to dissect a circuit breaker and determine how it operates. You also need to look at the circuit breaker in terms of design for assembly and manufacture. Your team will be provided with a 15-amp circuit breaker, tools, a roll of tape, and a plate. The task consists of disassembling the circuit breaker, sketching each component, determining how the circuit breaker operates, and reassembling it so that it works. Before taking the internal system apart, be sure to take plenty of pictures ! They will help with reassembly. Using the Guide to Circuit Breaker Disassembly & Assembly , carefully take the circuit breaker apart. Do this over the plate, as there are many small parts and springs that could pop out. Keep track of each part and note where it came from. Consider using a numbering system. You might wish to place each part on a piece of tape, measure and label it. YouTube may be helpful in explaining the various features (e.g., https://www.youtube.com/shorts/RLfhz4QiOS4). After taking the circuit breaker apart, draw and label the components for use in creating assembly drawings. Determine how the circuit breaker operates, i.e., how excess current opens the circuit breaker. You will need to explain this in words with appropriate sketches. Determine how you would redesign the circuit breaker to make it easier to manufacture and assemble. Part reduction and simplification are keys to this. Reassemble the circuit breaker and make sure that it works. You will have to demonstrate this to the instructors when you are asked to turn in the materials. Deliverables: Your team will be responsible for the following deliverables. 1. Report (85%) This is a team assignment. You and your team members must collectively produce a report formatted as a PDF-file that is to be uploaded in Canvas before the start of the week 5 Studio. The report is to include a cover page followed by a maximum of 3 pages of text using 12-point font, 1-inch margins, and 1.5-line spacing. An appendix that does not contribute toward the page limit can be added to incorporate figures and tables. Use page numbers at the bottom of each page. (Page 1 begins with the report body, which usually begins with an introduction.) The submission should include the following: Cover Page: See the attached example. The cover page is to include the title of the assignment, section information (e.g., name/number), instructor name, TA name, and team member names. It

2 is to be on its own separate page, which does not count toward the page limit. Abstract: This is a one-paragraph summary of what the reader should expect to learn if the report body is read. It should summarize the objective of your work, your approach, and an explanation as to how the objective was met with results (or why the objective was not met). The Abstract should be on its own separate page. It does not count toward the page limit. Report body: This is a written technical document that conveys information in an objective and fact-based manner, consisting of three key features: process, progress, and results. Write in the third-person, and consider presenting content in the following progression for clarity:  Introduction: Restate the objective of the study. Include any engineering challenges associated with achieving this objective.  Design: Using the design tools discussed in lecture, give an overview of the customer needs, performance specifications, and functions for this type of product. Review the design of the product in terms of user interaction. Discuss potential risks to the user.  Analysis: Explain how the product works. Create a set of assembly instructions such that with the right materials, the circuit breaker could be recreated without the original assembly present. Provide tables and labeled figures that support your discussion, utilizing the same labels in the text. Consider offering effective visualizations using exploded views, section views, and hiding/isolating components.  Conclusions: Summarize your report with any recommendations on how to make the circuit breaker easier to manufacture and or assemble. If the objective of the study was achieved, explain how. If not, explain why. Appendix: Figures and tables should NOT be included in the report body; rather, they should be placed in an Appendix. Each figure is to be presented in such a way as to match the sequential order of its respective citation within the report body. Figure captions go below the figure . Tables are to be similarly cited, but with their captions placed above the table . All fonts in the figures and tables must be easily visible. All figures and tables must be cited in the report body. Contributions statement: See attached example. Your team should include a brief statement for each member indicating the respective contributions made to the report, including the writing, drawing, editing, and reviewing of content and illustrations. The statement is to be on its own separate page. It does not count toward the page limit. 2. Presentation (15%) In Studio Week 5, your team is to deliver a PowerPoint presentation summarizing your report. The presentation is limited to a maximum of 10 minutes . It should include an agenda, a discussion of what was observed in dissecting the circuit breaker, a summary on how it is assembled (include part listings and assembly drawings), and recommendations for product improvement. A copy of the presentation should be submitted in PDF form to Canvas before the start of the Studio. One person on your team will give this presentation. 3. Peer Evaluation. You will be evaluating the performance of your peers and yourself on the project team. A sample peer evaluation form is provided on the ME2110 Canvas website. The peer evaluation should be submitted in PDF form through Canvas before the deadline.

3 **EXAMPLE COVER PAGE** ME2110 – Section A01 Studio #2 Report Team 1: Team Member 1 Team Member 2 Team Member 3 Team Member 4 Submitted to: Instructor Name TA: TA Name Date: ######

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4 **EXAMPLE CONTRIBUTIONS STATEMENT** Contributions Statement 1. Student 1 – Contributed toward writing the assembly instructions and the Abstract and Introduction sections, as well as final editing of the report. 2. Student 2 – Contributed toward review of the assembly instructions and writing the report discussion. 3. Student 3 – Contributed toward figure preparation and writing the assembly instructions. 4. Student 4 – Contributed toward generation of figures and tables, as well as writing the report discussion.