Life without rules is chaos and CAD is no different. In chapter 1 lesson 5, we dive into constraints, the rules that define how your sketches behave in Fusion. Constraints are the foundation of turning rough sketches into precise, reliable models.

We’ll go step by step through essential constraints like parallel, horizontal/vertical, coincident, equal, midpoint, and perpendicular. You’ll see how these rules interact with each other to keep your geometry stable and predictable, and how they move you closer to a fully defined sketch (black lines) instead of an undefined one (blue lines).

What you’ll learn in this episode:

• Why constraints are the rules of CAD
• How to apply key constraints: parallel, coincident, equal, midpoint, perpendicular
• The difference between blue (undefined) and black (fully defined) sketches
• How constraints interact to make sketches stable and predictable