Introduction
The yo-yo project has small teams of students experience designing and manufacturing a simple product at scale. Throughout the project experience, students will have a chance to create a new yo-yo design, develop a computer-aided design (CAD) model, computer numerically controlled (CNC) machine tooling for injection molding using computer-aided machining (CAM), create thermoform tooling using additive manufacturing, and operate industrial injection molding and thermoforming machines themselves. This is an iterative process that allows the students to see the implications of their design details all the way through to final production!
| Requirements and Geometric Considerations | |
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| Minimum Number of Parts |
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| Recommended String Gap |
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| IM Part Guidelines |
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| Thermoforming Part Guidelines |
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| Project Details |
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Manufacturing Review Rubric
Presentation Structure
- Be ready to present CAD and manufacturing results (quality of your manufactured parts) for all parts of the yo-yo:
- Bring example parts and molds.
- Be ready to discuss the biggest challenges and roadblocks your team has overcome.
- Have a clear outline and description of any remaining issues, including plans for addressing those concerns.
- Have measurement data (bluetooth caliper measurements) ready for 100 of your body and ring parts (as final as possible).
- Students will be graded based on the following criteria:
- completeness of the required elements
- clarity of presentation
Press Fit Engineering Analysis
- Present the analysis documented in the manufacturing spreadsheet, preparing slides that highlight each key decision-making step.
- Instructors and LAs will have the spreadsheet open for reference.
- Explain the full thread of the press-fit features of your yo-yo, connecting the decisions made during the design phase to the results of the manufacturing phase:
- How well did you deliver on your own specifications?
- How do your body and ring distributions characterize the success of your manufacture processes?
- Using engineering reasoning, why are there differences between your specifications and measured parts?
- What did you learn along the way?
- Students will be graded based on the following criteria:
- completeness of the spreadsheet parameters up to this point
- soundness of the engineering reasoning used to make key decisions about press fit parameters
- consistency between the manufacturing spreadsheet, CAD, and the message conveyed in the presentation
Design for Manufacturing
- How did you work towards delivering high quality components/assemblies?
- Which features ended up being the hardest to manufacture?
- How does this experience match up to what you thought was going to be hardest?
- Students will be graded based on the following criterion:
- effectiveness and appropriateness of manufacturing results
Organization and Planning
- Did your team utilize your backup plan protocol?
- What was your thinking for managing risk and scaling back your designs?
- How did your team manage yourselves in terms of getting all the requirements completed?
- Were there any interesting strategic decisions that had to be made to meet the deliverables?
- What is left to do to meet the final 50 yo-yo’s lab deliverable?
- Students will be graded based on the following criteria:
- demonstration of engineering reasoning applied to strategic decision making throughout the manufacturing portion of the yo-yo project
- overall clear messaging, effective presentation, and coherent reasoning presented throughout the manufacturing reviews
