Core concept
Make a legible drawing packet in which the exploded view, balloons, part quantities, materials and final CAD revision agree.
IED Unit 3 • Lesson 3.12
Assembly Drawing, Exploded View & BOM
Focus question: How can technical documentation show another person exactly how a modular rocket is assembled?
Your lesson guide
Objective
Apply technical drawing skills to a true component assembly. Create an exploded view that communicates module and fin relationships. Connect item balloons to a complete bill of materials.
Materials
What the diagram means: Manufacturing drawings use orthographic and isometric views, an exploded assembly with balloons, a matching BOM and a final revision. The example values illustrate the principle and do not replace actual teacher-assigned dimensions.
Plan your time
Suggested work block: 45–60 minutes. Physical builds and projects may span several classes; follow your teacher’s schedule.
IED Unit 3 • Lesson 3.12 Learning Studio
Understand the engineering, follow the examples, and document the result
Today's process
Create assembled orthographic and isometric views; explode modular components in a logical sequence; add balloons tied to BOM items; specify fin material, thickness and the launcher reference.
Worked example
Example BOM: lower module ×1, body ×1, nose ×1, laser-cut fins ×3 or ×4. Launcher tube is external reference equipment.
01 / Visual lesson
Exploded Views, Technical Drawings and BOM
Make a legible drawing packet in which the exploded view, balloons, part quantities, materials and final CAD revision agree. This diagram is explanatory rather than a tested or dimensioned engineering artifact.
02 / Watch and research
Engineering tutorials and further learning
Fusion workflow review
Apply the useful modeling and assembly techniques to this lesson; sample parts in the tutorial may differ from your rocket.
Open the video on YouTube ↗Expert technical references
Read these Autodesk or NASA learning resources for the relevant design or aerospace fundamentals.
Primary technical reference ↗Additional learning reference ↗Learn independently: read, pause, apply the idea, then record the actual evidence.
03 / Follow the procedure
Guided engineering workflow
Steps for your project
- Create assembled orthographic and isometric views
- explode modular components in a logical sequence
- add balloons tied to BOM items
- specify fin material, thickness and the launcher reference.
What your result means
Example BOM: lower module ×1, body ×1, nose ×1, laser-cut fins ×3 or ×4. Launcher tube is external reference equipment.
Example statements are not actual flight observations or substitute measurements. Use the original requirements and instructor approval.
04 / Independent checks
Review your evidence before submitting
Concept explorer: total finished mass
Not a measurement or GO authorization. For 3.14, only actual flight observations count.
Self-check questions
Why match balloons to BOM rows?
To identify the precise component and quantity for assembly.
Can the BOM live inside the PDF drawing?
Yes. A single complete drawing PDF can include the BOM and notes.
The existing “What to Submit” section below provides exact filenames and required proof.
IED Unit 3 • Lesson 3.12 • Learning Studio
Learn the concepts before completing the assignment
Engineering concept
Manufacturing drawings use orthographic and isometric views, an exploded assembly with balloons, a matching BOM and a final revision.
Today's engineering work
Use the approved final design; add assembled views, exploded spacing, balloons, item quantities/materials, measured fin thickness, two interface notes and a launcher-reference dimension.
Worked example
Example BOM: 1 lower/fin module, 1 hollow body, 1 nose and 3 or 4 individual laser-cut fins. The ground launcher cylinder is not a flight part.
01 / Illustrated concept
Assembly Drawings & Bill of Materials
What the diagram means: Manufacturing drawings use orthographic and isometric views, an exploded assembly with balloons, a matching BOM and a final revision. The example values illustrate the principle and do not replace actual teacher-assigned dimensions.
02 / Watch and research
Instructional video and technical resources
Fusion assembly joints refresher
Use the relevant modeling or assembly technique; the demonstration project may differ from the rocket assignment.
Watch directly on YouTube ↗Expert references
Use these official Autodesk or NASA guides when the video alone does not explain the underlying workflow.
Primary technical reference ↗Additional learning resource ↗Self-study: identify a key technique, pause the tutorial, apply the operation and verify the result before continuing.
03 / Step-by-step guide
From theory to your own project
Guided task sequence
- Use the approved final design
- add assembled views, exploded spacing, balloons, item quantities/materials, measured fin thickness, two interface notes and a launcher-reference dimension.
Worked example and verification
Example BOM: 1 lower/fin module, 1 hollow body, 1 nose and 3 or 4 individual laser-cut fins. The ground launcher cylinder is not a flight part.
Important: Do not substitute illustrative numbers for actual CAD dimensions, real measurements or instructor approvals.
04 / Independent practice
Explore one key parameter
Interactive concept explorer
Illustrative values only; not a completed engineering inspection or teacher authorization.
Check your reasoning
What must each exploded-view balloon match?
One correct part row in the bill of materials.
Can the BOM be included on the drawing PDF?
Yes. One complete drawing and BOM package is appropriate.
Use the lesson's original assignment and “What to Submit” sections below for exact deliverable requirements.
Lesson Overview
What You Are Learning
Learning Targets
- Apply technical drawing skills to a true component assembly.
- Create an exploded view that communicates module and fin relationships.
- Connect item balloons to a complete bill of materials.
- Document removable connections and manufacturing materials.
Unit 3 Progression
Unit 2 introduced basic drawing and exploded-view skills. This lesson advances those skills into professional assembly documentation.
ComponentsAssembleVerifyFabricateReviseFlight Test
Compressed-Air Rocket Challenge
Project Requirements
These requirements apply throughout Lessons 3.6–3.14.
1/2 in PVC Reference Tube
- The launcher tube outside diameter is 0.840 in (21.34 mm).
- Model the launch tube as a separate grounded Fusion reference component.
- You choose the rocket's internal launch clearance, but the finished rocket must slide freely over the actual PVC tube without binding.
- Before choosing the rocket's internal bore dimension, measure the actual unpressurized classroom launch tube. The 0.840 in (21.34 mm) diameter is the nominal outside-diameter reference, not the target bore size.
- The launcher itself is teacher equipment and is not modified as part of this project.
Modular 3D-Printed Rocket
- The structural rocket body is 3D printed in classroom-approved filament.
- Use at least 3 major printed modules: a lower launch/fin module, a main body module, and a nose/upper module.
- The rocket must have at least 2 removable printed-to-printed interfaces.
- Major printed modules must be disassembled without damaging the parts; permanent adhesive is not allowed between major modules.
Connection Method
- You choose how major modules connect.
- Examples include keyed/slip couplers with retention, twist-lock/bayonet features, screws/inserts, snap-fit features, or another approved method.
- The connection must keep the rocket aligned and secure during handling and flight-readiness checks.
- If a connection uses hardware or a tool, it must still be serviceable without damaging the printed parts.
Laser-Cut Fin Assembly
- Use 3 or 4 identical fins, equally spaced at 120° or 90°.
- Fins are laser-cut from 1/8 in acrylic or plywood.
- Use 3.175 mm as the nominal CAD thickness, then measure the actual stock and use that measurement for the final fin interface.
- Fins must use a repeatable locating feature such as slots, tabs, keyed pockets, or another approved feature. Surface gluing alone is not an acceptable locating method.
- Adhesive may be used to retain the fins after the fit/alignment check is approved.
Lightweight by Design
- Primary body walls should generally be 1.2–2.0 mm thick; 1.6 mm is the recommended target.
- Geometry thicker than 2.5 mm should be limited to local interfaces, couplers, fin mounts, fastener features, or other justified reinforcement.
- Total predicted 3D-printed material should be 100 g or less.
- The finished rocket should have a total mass of 125 g or less before the flight-readiness review.
Build for the Classroom Process
- Every printed component must fit the classroom printer build volume and be designed to print without support material.
- No support material may be required inside the launch bore or any mating interface.
- The nose must be rounded/blunt, and exposed fin corners/edges must be made safe before flight.
- Only the instructor operates, pressurizes, or changes settings on the compressed-air launcher.
Assignment
Document the Final Rocket Assembly
Create documentation that clearly distinguishes 3D-printed modules, laser-cut fins, and any hardware used in the student-selected connection system.
Step-by-Step Instructions
- Create the final assembly drawing: Use the final flight revision from Lesson 3.11.
- Add assembled views: Include the minimum orthographic and isometric views needed to communicate the rocket.
- Create an exploded view: Show the major printed modules, fins, and any separate hardware/components in a logical disassembly direction.
- Add a BOM: Include item number, part/component name, quantity, manufacturing method/material, and any instructor-required fields.
- Add balloons: Every major component in the exploded view must correspond to the correct BOM item number.
- Document fin material: Identify acrylic or plywood and the measured material thickness used in the design.
- Document removable interfaces: Add notes that explain how the major modules are assembled/disassembled when the method is not obvious.
- Add launcher-interface information: Identify the 0.840 in / 21.34 mm OD PVC launcher reference as an interface requirement, not a manufactured rocket part.
- Add revision information: Document the final revision created after physical fit testing.
- Export the drawing: Save a clean final PDF.
Before You Submit
- The exploded view shows all major modules and fins.
- BOM quantities and names match the Fusion Browser.
- Every balloon matches a BOM item.
- Manufacturing method/material is identified.
- Removable interfaces are understandable.
- The final revision matches the flight-ready CAD.
Submission
What to Submit
Submit only the following assignment-specific deliverables in Google Classroom:
Resources
Lesson Resources
IED Unit 3
Return to the Unit 3 lesson map and project sequence.
Introduction to Engineering Design
Return to the IED course hub.
Build your lesson report
Checkpoint: is your evidence ready?
- Check calculations, units, labels, and measurements against the activity requirements.
- Record what actually happened, including unexpected results.
- Explain what you changed and why; attach required drawings, photos, CAD, or code in your classroom assignment.
Submit only the following assignment-specific deliverables in Google Classroom: Final assembly drawing (one PDF): LastName_FirstName_3_12_AssemblyDrawing.pdf containing assembled isometric and orthographic views, a clearly spaced exploded view, balloons matching every BOM item, and a completed title/revision block. Bill of materials (on the drawing PDF): include item number, descriptive part name, quantity, manufacturing method/material, and fasteners or other separate hardware where present.
A PDF download is not a submission. Review it, then upload it and any required attachments through your classroom assignment system.