I. Introduction

Computer-Aided Design (CAD) is the use of software to create, edit, and communicate 2D drawings and 3D models. CAD is how engineers and designers turn an idea into geometry that can be measured, tested, and manufactured.

II. Outline

  1. CAD Basics
    • Sketching in 2D (lines, arcs, circles)
    • Constraints and dimensions
    • Feature-based modeling (extrude, revolve, fillet, chamfer, shell)
    • Parametric design
    • Reference geometry (planes, axes, coordinate systems)
  2. Solid Modeling vs Mesh Modeling
    • Solid modeling (engineering parts, accurate dimensions)
    • Mesh modeling (triangles; common in graphics/animation and many STL workflows)
    • When to use each (manufacturing vs visualization)
  3. Assemblies and Mates
    • Parts vs assemblies
    • Mates/constraints (hinges, sliders, rigid joints)
    • Collision checks and clearances
  4. Engineering Drawings
    • Orthographic views, isometric views
    • Dimensions, tolerances, notes, title blocks
    • Section views and detail views
  5. CAD for Manufacturing
    • Export formats
    • Basics of design-for-manufacturing
    • 3D printing vs CNC vs laser cutting
  6. CAD across STEM
    • Mechanical/Aerospace: parts, mechanisms, fixtures, tolerances
    • Civil/Architecture: structures, site layouts, building models
    • Electrical/Computer: enclosures, mounting, clearances, hardware integration
    • Physics/Research: building geometry for experiments and simulations

III. Free Resources

IV. Video Series

V. Software to start with

  • Beginner Friendly
  • Engineering CAD
    • FreeCAD
    • Onshape — Browser-based CAD with strong assemblies; Free tier does not allow for private documents, meaning anyone with the link can see your project.
  • Written Code and More Customizable
  • Visuals and Animation

VI. See Also