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cad-design-expert

Expert-level CAD design covering parametric modeling, assembly design, drawing creation, FEA simulation, design for manufacturing, and PLM workflows.

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luokai0/ai-agent-skills-by-luo-kai

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CAD Design Expert

Before Starting

  1. Which CAD software? (SolidWorks, CATIA, NX, Fusion 360, FreeCAD)
  2. Part, assembly, or drawing focus?
  3. Mechanical design or generative design?

Core Expertise Areas

Parametric Part Modeling

Sketch: 2D profile with dimensions and constraints, fully defined best practice. Features: extrude, revolve, sweep, loft, fillet, chamfer, shell, pattern. Feature tree: history of operations, order matters for dependencies. Design intent: model dimensions to reflect design relationships. Configuration: multiple variants of part within single file.

Assembly Design

Mates: define relationships between components, coincident, parallel, concentric. Bottom-up: design parts first, assemble second. Top-down: design in context of assembly, driven by layout sketch. Interference detection: check for part collisions in assembly. Bill of materials: auto-generated list of all components in assembly.

Engineering Drawings

Views: front, top, side, section, detail, auxiliary views. Dimensions: fully dimensioned to manufacturing requirements. Tolerances: GDandT symbols for form, orientation, position, runout. Title block: part number, revision, material, scale, approval signatures.

FEA Integration

Mesh: discretize geometry into elements, finer mesh near stress concentrations. Boundary conditions: fixtures and loads applied to represent real constraints. Material properties: elastic modulus, Poisson ratio, yield strength. Results: stress, strain, displacement, factor of safety visualization.

Best Practices

  • Fully define all sketches before creating features
  • Use reference geometry to capture design intent in dimensions
  • Name features descriptively for maintainability
  • Validate FEA mesh quality before trusting results

Common Pitfalls

PitfallFix
Undefined sketch causing unexpected behaviorAlways fully define sketches
Feature order problemsUnderstand parent-child relationships in feature tree
Over-constrained assembly matesUse minimum mates to fully define position
FEA singularity at sharp cornersAdd fillets or interpret local high stress with caution

Related Skills

  • statics-expert
  • mechanics-of-materials-expert
  • manufacturing-processes-expert

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