Learning Targets
- Run fit tests against assembly criteria.
- Compare CAD expectations to physical prototype results.
- Write revision notes that explain what should change next.
IED Unit 3 • Lesson 3.12
Prototype Fit Testing and Revision Notes
Focus question: How can fit testing guide final documentation?
Mission Briefing
Today’s Plan
Use this page with the lesson presentation, your engineering notebook, and the tools or evidence assigned for Test Prototype Fit and Record Revisions.
Success Looks Like
You can turn prototype fit testing into revision notes for the final design package.
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Opening Prompt
How can fit testing guide final documentation?
Connect your response to the decision, evidence, or quality standard required for Test Prototype Fit and Record Revisions.
Reveal: useful engineering move
This lesson is ready to move forward when the evidence meets this standard: Each conclusion is linked to a specific physical observation or measurement.
Core Skill
What We Are Practicing
Fit testing connects physical evidence to future revisions.
Strong notes describe the issue, evidence, and recommended change.
Testing results help explain the limits of the final prototype.
Your Task
Test Prototype Fit and Record Revisions
Evaluate the physical connections systematically and convert the results into specific revision notes for final documentation.
- Identify each critical connection to inspect.
- Test fit and alignment using the same criteria for each part.
- Measure or photograph any gap, interference, or loose condition.
- Write a revision note or confirm the final condition.
Quality check: Each conclusion is linked to a specific physical observation or measurement.
Lesson Interactive
Use Prototype Data to Select a Revision
Review the measured results and identify the part and change most directly supported by the evidence.
Prototype Fit Data
| Feature | CAD target | Measured average | Observed result |
|---|---|---|---|
| Body inside diameter | 40.00 mm | 40.05 mm | Within expectation |
| Coupler outside diameter | 39.70 mm | 40.02 mm | Too tight |
| Fin angle | 90.0° | 89.8° | Acceptable |
Choose the Revision
Use the measured error—not the symptom alone—to identify the component and parameter that should change.
What You Will Submit
Prototype Fit Results
Submission standard: Each conclusion is linked to a specific physical observation or measurement.
Resources
Lesson Resources
Lesson 3.12 PowerPoint
Use the lesson slides for guided practice, interactive checks, and the exit ticket.
Introduction to Engineering Design
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