Learning Targets
- Identify contact surfaces and alignment features.
- Use section views or measurements to check fit.
- Record evidence before revising or printing.
IED Unit 3 • Lesson 3.4
Assembly Alignment and Fit Checks
Focus question: How do engineers check fit before fabrication?
Mission Briefing
Today’s Plan
Use this page with the lesson presentation, your engineering notebook, and the tools or evidence assigned for Check Alignment and Planned Fit.
Success Looks Like
You can use CAD evidence to decide whether rocket parts align and fit before printing.
LaunchLearnApplyCheckSubmit
Opening Prompt
How do engineers check fit before fabrication?
Connect your response to the decision, evidence, or quality standard required for Check Alignment and Planned Fit.
Reveal: useful engineering move
This lesson is ready to move forward when the evidence meets this standard: The fit check uses visible or measured evidence rather than appearance alone.
Core Skill
What We Are Practicing
Digital fit checks reduce failed prints.
Alignment should be inspected, not assumed.
A fit decision needs screenshots, measurements, or notes as proof.
Your Task
Check Alignment and Planned Fit
Use section views, measurements, and visual inspection to verify that connected components align and have the intended clearances.
- Identify the critical mating surfaces.
- Measure or inspect alignment between connected parts.
- Check for overlap, unintended gaps, or off-axis placement.
- Record one confirmed fit or one issue requiring revision.
Quality check: The fit check uses visible or measured evidence rather than appearance alone.
Lesson Interactive
Tune Alignment and Planned Clearance
Adjust the nose-cone position until its axis matches the body axis and the planned fit gap matches the tested clearance.
Alignment Preview
Fit gap
Axis offset
Adjustment Controls
Set the axes coincident and apply the 0.30 mm clearance supported by the tolerance tester.
What You Will Submit
Assembly Fit Check
Submission standard: The fit check uses visible or measured evidence rather than appearance alone.
Resources
Lesson Resources
Lesson 3.4 PowerPoint
Use the lesson slides for guided practice, interactive checks, and the exit ticket.
Introduction to Engineering Design
Return to the IED course hub for units, resources, certifications, and current course information.