cad-modeling

# 3D CAD Modeling Skill ## Purpose The 3D CAD Modeling skill provides expert capabilities for parametric 3D CAD model development with proper design intent, configuration management, and best practices for model quality and reusability. ## Capabilities - SolidWorks, CATIA, NX, Creo workflow automation - Parametric feature-based modeling best practices - Assembly design and constraint management - Design table and configuration creation - Top-down and bottom-up assembly strategies - Part family and library component creation - Model validation and quality checking - CAD data exchange and translation ## Usage Guidelines ### Part Modeling #### Design Intent Capture 1. **Sketch Best Practices** - Fully constrain all sketches - Use construction geometry - Apply meaningful dimensions - Reference design features, not edges 2. **Feature Planning** ``` Order of features: 1. Primary form (base feature) 2. Secondary forms 3. Positioned features 4. Detail features (rounds, chamfers) 5. Reference geometry ``` 3. **Parametric Relationships** - Link related dimensions - Use equations for complex relationships - Create global variables for key parameters - Document design equations #### Feature Best Practices | Feature Type | Best Practice | |--------------|---------------| | Extrude | Use mid-plane when symmetric | | Revolve | Full 360 or symmetric angle | | Sweep | Keep profile perpendicular to path | | Loft | Match profile vertex...