Learning Targets
- Explain how orthographic projection represents a 3D object with flat views.
- Choose a front view that communicates the characteristic shape clearly.
- Use projection lines to align corresponding features across views.
IED Unit 1 • Lesson 1.7
Orthographic Projection
Focus question: Why do engineers use multiple 2D views instead of only one 3D sketch?
Mission Briefing
Today’s Plan
Use this page with the lesson presentation and your engineering notebook.
Success Looks Like
Shared edges and features align across the front, top, and right views.
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Opening Prompt
Why is one flat view often not enough to describe a three-dimensional object?
Think first, then be ready to share a short response that connects the question to engineering communication.
Reveal: why this matters
A single view can hide depth or overlapping features. Multiple aligned views reveal different sides while describing one consistent object.
Core Skill
What We Are Practicing
Orthographic projection represents a 3D object with multiple flat views.
Each view shows only two directions of the object at a time.
Alignment between views allows the reader to connect the same feature across projections.
Lesson Interactive
Use the 3D Part to Identify the Top View
Study the interactive 3D model, then select the orthographic drawing that shows the part from above. If you need help, use the standard-view buttons to check the model from the top, front, or right side.
3D Part Reference
Loading 3D model…
Drag to rotate • Scroll or pinch to zoom • Use the view buttons to test a projection
Calculating dimensions…
Projection hint: A top view shows width and depth. It does not show the object’s height changes as a tall profile.
Which drawing is the top view?
Use the model and the three drawings together. The top view is the one you would see looking straight down from above.
Your Task
Translate One Object into Three Projections
Start with a provided isometric object and create a coordinated front, top, and right orthographic set.
- Select the front view that shows the object’s characteristic shape clearly.
- Draw the front view and use light projection lines to transfer feature positions.
- Construct the top and right views in the correct arrangement.
- Check that steps, holes, and corresponding edges align across all three views.
Quality check: The views must describe one consistent object; no feature may shift position or change shape between projections.
What You Will Submit
Three-View Orthographic Set
Submit one coordinated drawing set and one short design-reading note.
Submission standard: Focus on projection, alignment, consistent geometry, and even spacing between the three views.
Resources
Lesson Resources
Lesson 1.7 PowerPoint
Use the lesson slides for guided practice, interactive checks, and the exit ticket.
Introduction to Engineering Design
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