Learning Targets
- Add dimensions that control size and placement.
- Identify key dimensions that define design intent.
- Avoid unnecessary or conflicting dimensions.
IED Unit 2 • Lesson 2.5
Dimensioned CAD Sketches
Focus question: How do dimensions make CAD models precise and adjustable?
Mission Briefing
Today’s Plan
Use this page with the lesson presentation, your engineering notebook, and the tools or evidence assigned for Dimension the Sketch for Design Control.
Success Looks Like
Your sketch uses dimensions to make the model accurate and adjustable.
LaunchLearnModelCheckSubmit
Opening Prompt
What makes a CAD dimension different from a note written next to a sketch?
Connect your response to the decision, evidence, or quality standard required for Dimension the Sketch for Design Control.
Reveal: useful CAD thinking move
A CAD dimension controls geometry. When it changes, the sketch updates, so dimensions become part of the model’s design intent.
Core Skill
What We Are Practicing
Dimensions convert rough geometry into measurable engineering intent.
Key dimensions should come from sketches, requirements, or measured objects.
Over-dimensioning can make sketches hard to edit.
Fusion & Fabrication Help
Video Help
Quick Tip: Changing Dimensions in a Sketch
Use this video to review how dimensions control size and how changing a dimension updates a sketch.
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
Drive a Sketch with Dimensions
Adjust the controlling dimensions until the sketch meets the target requirements. Watch the geometry update as each value changes.
Live Dimensioned Sketch
Target: 80 mm wide, hole center 25 mm from left
Use dimensions to control size and feature location rather than dragging geometry by eye.
Your Task
Dimension the Sketch for Design Control
Add dimensions that control the overall size and the location of important internal geometry.
- Identify the dimensions that define the outside size.
- Add dimensions that locate the important internal feature.
- Edit one value and observe how the sketch updates.
- Return the sketch to the assigned values and confirm it is fully controlled.
Quality check: The sketch is controlled by meaningful dimensions rather than duplicated or unnecessary measurements.
What You Will Submit
Dimensioned Sketch
Submission standard: The sketch is controlled by meaningful dimensions rather than duplicated or unnecessary measurements.
Resources
Lesson Resources
Lesson 2.5 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.