Learning Targets
- Apply common sketch constraints.
- Explain how constraints control sketch behavior.
- Check whether a sketch changes predictably.
IED Unit 2 • Lesson 2.4
Sketch Constraints
Focus question: How do constraints control design intent?
Mission Briefing
Today’s Plan
Use this page with the lesson presentation, your engineering notebook, and the tools or evidence assigned for Control a Sketch with Constraints.
Success Looks Like
Your sketch changes in a controlled way when dimensions are edited.
LaunchLearnModelCheckSubmit
Opening Prompt
Why is a sketch that “looks right” not always good enough?
Connect your response to the decision, evidence, or quality standard required for Control a Sketch with Constraints.
Reveal: useful CAD thinking move
A sketch can look correct but still be under-controlled. Constraints make relationships intentional so the sketch behaves predictably during revisions.
Core Skill
What We Are Practicing
Constraints describe relationships between sketch entities.
A fully defined sketch behaves predictably.
Uncontrolled sketches can shift unexpectedly.
Fusion & Fabrication Help
Video Help
Fusion 360: Sketch Constraints
Review how geometric constraints control sketch behavior and help create stable, fully constrained profiles.
Pause, replay, or open the tutorial in a new tab while you work. Follow the lesson requirements when the video uses a different example.
Lesson Interactive
Constrain the Slot Sketch
Select the geometric constraints needed to keep the slot square, connected, and symmetric without adding a redundant relationship.
Sketch to Control
Choose only the relationships that control the intended geometry without redundancy.
Your Task
Control a Sketch with Constraints
Add geometric relationships so the sketch keeps its intended shape when geometry is moved or edited.
- Identify lines or points that should remain horizontal, vertical, connected, parallel, or equal.
- Apply only the constraints needed to communicate those relationships.
- Drag-test the sketch to find uncontrolled geometry.
- Correct conflicts or missing relationships and save the sketch.
Quality check: The sketch maintains its intended relationships during a drag test without unnecessary or conflicting constraints.
What You Will Submit
Constraint Check
Submission standard: The sketch maintains its intended relationships during a drag test without unnecessary or conflicting constraints.
Resources
Lesson Resources
Lesson 2.4 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.