Why Do Engineers Use CAD?

If you want to build a house, you don’t just start nailing wooden boards together; you draw a blueprint. The same principle applies to robotics and mechanical engineering. However, modern blueprints aren’t drawn on paper—they are modeled in CAD (Computer-Aided Design) software.

What Does CAD Do?

Programs like SolidWorks, Autodesk Fusion 360, and Onshape allow engineers to build high-fidelity 3D models of their inventions in a completely virtual space.

Every single screw, gear, metal sheet, and motor is assembled digitally before a single real-world part is ever purchased or manufactured.

The Benefits of Virtual Design

Designing complex machinery without CAD is a recipe for disaster. Here is why CAD is an absolute necessity in professional engineering:

1. Fit Check: You can visually ensure that the robot’s arm won’t collide with its own wheels when it rotates.
2. Weight Calculations: The software knows the density of aluminum versus steel, and will automatically calculate the total weight and center of mass of the entire assembly.
3. Stress Testing: Advanced CAD features allow engineers to simulate physical forces. Will that plastic bracket snap if 50 pounds of pressure is applied? The software will tell you.
4. Manufacturing Blueprints: Once a 3D model is finished, the software can automatically export CNC machining paths or 3D printable files for instant manufacturing.

Mastering CAD in FIRST®

In the FIRST® Tech Challenge (FTC), designing visually stunning and mechanically robust robots requires intensive CAD skills. Standard robotics kits can only take a team so far; eventually, you have to design custom solutions.

Many competitive FTC teams CAD their entire robot top-to-bottom over the summer. When the season starts, they already have a complete bill of materials to order and exact dimensions for every custom plate they need to machine.

Learning parameter-driven CAD is often cited by FIRST alumni as the single most valuable “hard skill” they carried directly into their college mechanical engineering programs!