feat(engineering): add solidworks-expert skill — 3D modeling, GD&T, FEA, sheet metal

Author: chad848

engineering/solidworks-expert/SKILL.md

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+---
+name: "solidworks-expert"
+description: "Use when the user asks to model parts or assemblies in SolidWorks, create engineering drawings with GD&T, design sheet metal flat patterns, run FEA simulation, export STEP/IGES/STL, or troubleshoot SolidWorks rebuild errors."
+---
+
+# SolidWorks Expert
+
+## Overview
+
+Parametric 3D CAD skill for SolidWorks: part modeling, assembly design, engineering drawings, sheet metal, weldments, and FEA simulation. Follows ASME Y14.5-2018 for GD&T and supports DFM guidance.
+
+## Core Competencies
+
+### Part Modeling
+- Extrude, Revolve, Sweep, Loft, Shell, Rib features
+- - Fillet, Chamfer, Draft, Hole Wizard, Thread
+  - - Fully constrained sketches with design intent
+    - - Configurations and Design Tables for parametric variants
+     
+      - ### Assembly Design
+      - - Bottom-up (parts first) and top-down (in-context) workflows
+        - - Mates: Coincident, Concentric, Distance, Angle, Gear, Cam, Slot
+          - - Interference Detection; Large Assembly Mode with SpeedPak
+           
+            - ### Engineering Drawings
+            - - Views: Front, Top, Section, Detail, Broken-out, Isometric
+              - - GD&T per ASME Y14.5-2018: form, orientation, location, runout
+                - - Auto-generated Bill of Materials; title block linked to properties
+                 
+                  - ### Sheet Metal
+                  - - Base Flange, Edge Flange, Miter Flange, Hem
+                    - - Flat Pattern with bend lines for laser/punch
+                      - - K-Factor and bend allowance tables
+                       
+                        - ### Simulation (COSMOSWorks / Simulation)
+                        - - Static FEA: Von Mises stress, displacement, factor of safety
+                          - - Thermal: temperature distribution, heat flux
+                            - - Frequency: natural frequencies and mode shapes
+                              - - Curvature-based mesh with refinement at stress concentrations
+                               
+                                - ## Decision Framework
+                               
+                                - | Gate | Question | Action |
+                                - |------|----------|--------|
+                                - | Scope | Single part, assembly, or drawing? | Choose document type |
+                                - | Approach | Bottom-up or top-down? | Define assembly strategy |
+                                - | Output | Prototype, production, mold/tooling? | Select manufacturing method |
+                                - | Format | SW native, STEP, IGES, or STL? | Plan export strategy |
+                                - | Tolerance | Fit critical? | Apply GD&T per ASME Y14.5 |
+                               
+                                - ## Workflow
+                               
+                                - ```
+                                  Concept       -> Constrained 2D sketch with dimensions
+                                  Part Design   -> Base feature + dependent features
+                                  Validation    -> Interference check, mass properties, FEA
+                                  Assembly      -> Mates; top-down for contextual parts
+                                  Documentation -> Drawings with dims, tolerances, BOM, notes
+                                  Mfg Prep      -> Sheet metal flat patterns; mold tooling
+                                  Release       -> PDM check-in; STEP/PDF export
+                                  ```
+
+                                  ## Troubleshooting
+
+                                  | Problem | Cause | Solution |
+                                  |---------|-------|----------|
+                                  | Rebuild fails | Over-constrained sketch | Rollback bar; fix sketch first |
+                                  | Mate won't apply | Components misaligned | Move closer; use SmartMates |
+                                  | Fillet fails | Edge radius too small | Variable Radius Fillet |
+                                  | Large assembly slow | Too many loaded parts | Large Assembly Mode; SpeedPak |
+                                  | Drawing dims wrong | View misaligned | Orient view; verify ref geometry |
+                                  | Missing material | Custom material absent | Add to custom library |
+
+                                  ## Interoperability
+
+                                  | Format | Use Case |
+                                  |--------|----------|
+                                  | STEP AP214 | Neutral 3D exchange with any CAD |
+                                  | IGES | Legacy CAD interchange |
+                                  | STL | 3D printing and prototyping |
+                                  | DXF/DWG | 2D drawing exchange with AutoCAD |
+                                  | Parasolid | Native kernel for NX and Solid Edge |
+                                  | 3D PDF | Review without CAD license |
+
+                                  ## Cross-References
+
+                                  - **autocad-expert** — 2D DWG layout drawings and wiring harness documentation
+                                  - - **automotive-embedded** — ECU and sensor housing mechanical packaging
+                                    - - **spec-driven-workflow** — requirements-driven mechanical design