CAD Engineering Skill

Expert guidance on Computer-Aided Design systems, file formats, conversion technologies, and interoperability between CAD platforms.

Version Metadata

version: 1.0.0
python_min_version: '3.10'
compatibility:
  tested_python:
  - '3.10'
  - '3.11'
  - '3.12'
  - '3.13'
  os:
  - Windows
  - Linux
  - macOS

Changelog

[1.0.0] - 2026-01-07

Added:

Initial version metadata and dependency management
Semantic versioning support
Compatibility information for Python 3.10-3.13

Changed:

Enhanced skill documentation structure

When to Use

CAD software selection and guidance
File format conversions (DWG, DXF, STEP, IGES, etc.)
PDF to CAD conversion strategies
Technical drawing analysis
3D modeling approaches
Open-source vs proprietary CAD decisions
CAD automation and scripting
Cross-platform interoperability

Agent Capabilities

This skill integrates agent capabilities from /agents/cad-engineering-specialist/:

Open-Source CAD Expertise

| Software | Capabilities | |----------|-------------| | FreeCAD | Parametric 3D modeling, Python scripting, workbench customization | | LibreCAD | 2D drafting, DXF/DWG handling, command-line operations | | OpenSCAD | Programmatic 3D modeling, CSG operations, parametric design | | QCAD | Professional 2D CAD, scripting interface, batch processing | | BRL-CAD | Solid modeling, ray-tracing, geometric analysis | | Blender | CAD integration, mesh to solid conversion, technical visualization | | KiCAD | PCB design, electrical schematics, 3D board visualization |

Proprietary CAD Knowledge

| Software | Capabilities | |----------|-------------| | AutoCAD | Full command set, AutoLISP/VBA automation, custom tools | | SolidWorks | Feature-based modeling, API programming, PDM integration | | CATIA | V5/V6 platforms, complex surfaces, PLM workflows | | Inventor | Parametric design, iLogic rules, Vault integration | | Fusion 360 | Cloud collaboration, generative design, CAM integration | | Creo/Pro-E | Advanced assembly, mechanism design | | NX | High-end manufacturing, synchronous technology |

File Format Expertise

| Category | Formats | |----------|---------| | Native | DWG, DXF, DGN, IGES, STEP, STL, SAT, Parasolid | | Exchange | IFC, COLLADA, OBJ, FBX, 3DS, VRML, X3D | | Documentation | PDF, SVG, EPS, DWF, 3D PDF |

Delegation Capability

This specialist agent delegates to software-specific agents:

delegation:
  software_specific_agents:
    freecad:
      path: agents/freecad
      capabilities:
        - parametric_modeling
        - assembly_design
        - technical_drawings
    gmsh:
      path: agents/gmsh
      capabilities:
        - mesh_generation
        - finite_element_preprocessing
        - mesh_optimization

PDF to CAD Conversion

Conversion Strategy Selection

Vector PDFs: Direct vector extraction
Scanned Drawings: OCR and vectorization
Mixed Content: Hybrid approach
Complex Cases: Manual reconstruction

Conversion Tools

| Category | Tools | |----------|-------| | Commercial | AutoDWG, AnyDWG, Print2CAD, Scan2CAD, pdf2cad | | Open-Source | Inkscape+pstoedit, potrace, autotrace, pdf2dxf | | Libraries | OpenCV, Tesseract OCR, CADLib, LibreDWG, TeighaFile | | Cloud Services | Zamzar, CloudConvert, CAD Exchanger | | AI/ML Tools | Deep learning drawing recognition, neural vectorization |

PDF Analysis Workflow

from digitalmodel.agents.cad import PDFAnalyzer

# Analyze PDF type
analyzer = PDFAnalyzer()
analysis = analyzer.analyze("drawing.pdf")

print(f"PDF Type: {analysis['type']}")  # vector/raster/hybrid
print(f"Creation Method: {analysis['creation_method']}")
print(f"Embedded Fonts: {analysis['fonts']}")
print(f"Layer Info: {analysis['layers']}")
print(f"Scale Detection: {analysis['detected_scale']}")

# Get conversion recommendation
recommendation = analyzer.recommend_conversion()
print(f"Recommended Tool: {recommendation['tool']}")
print(f"Expected Accuracy: {recommendation['accuracy']}")
print(f"Manual Cleanup: {recommendation['cleanup_required']}")

Conversion Quality Optimization

from digitalmodel.agents.cad import CADConverter

converter = CADConverter()

# Pre-processing for scanned PDFs
converter.preprocess(
    input_file="scanned_drawing.pdf",
    operations=[
        "denoise",
        "deskew",
        "contrast_enhance"
    ]
)

# Vectorization with tuned parameters
result = converter.convert(
    input_file="scanned_drawing.pdf",
    output_file="drawing.dxf",
    options={
        "line_tolerance": 0.5,
        "arc_detection": True,
        "text_recognition": True,
        "dimension_extraction": True
    }
)

# Post-processing cleanup
converter.postprocess(
    file="drawing.dxf",
    operations=[
        "remove_duplicates",
        "close_gaps",
        "standardize_layers"
    ]
)

Format Conversion Examples

STEP to DXF

from digitalmodel.agents.cad import FormatConverter

converter = FormatConverter()

# Convert STEP to DXF with projection
result = converter.convert(
    input_file="model.step",
    output_file="drawing.dxf",
    projection="front",  # top, front, right, isometric
    scale=1.0,
    layer_mapping={
        "visible_edges": "0",
        "hidden_edges": "hidden",
        "dimensions": "dimensions"
    }
)

DWG Version Conversion

# Convert between DWG versions
result = converter.convert(
    input_file="drawing_2024.dwg",
    output_file="drawing_2010.dwg",
    target_version="2010"  # For compatibility
)

Batch Format Conversion

from digitalmodel.agents.cad import BatchConverter

batch = BatchConverter()

# Convert all STEP files to IGES
results = batch.convert_directory(
    input_directory="./step_files",
    output_directory="./iges_files",
    input_format="STEP",
    output_format="IGES",
    parallel=True,
    workers=4
)

# Generate conversion report
batch.generate_report(results, "conversion_report.html")

Technical Drawing Analysis

from digitalmodel.agents.cad import DrawingAnalyzer

analyzer = DrawingAnalyzer()

# Analyze technical drawing
analysis = analyzer.analyze("technical_drawing.dxf")

# Extract information
print(f"Drawing Scale: {analysis['scale']}")
print(f"Units: {analysis['units']}")
print(f"Layers: {analysis['layers']}")
print(f"Blocks: {analysis['blocks']}")
print(f"Dimensions: {len(analysis['dimensions'])}")
print(f"Text Annotations: {len(analysis['text'])}")

# Validate against standards
validation = analyzer.validate(
    standard="ISO",  # or "ANSI", "DIN", "JIS"
    checks=["layer_naming", "line_types", "dimensions"]
)

MCP Tool Integration

Swarm Coordination

// Initialize CAD expertise swarm
mcp__claude-flow__swarm_init { topology: "hierarchical", maxAgents: 5 }

// Spawn specialized agents
mcp__claude-flow__agent_spawn { type: "analyst", name: "format-analyzer" }
mcp__claude-flow__agent_spawn { type: "coder", name: "converter" }
mcp__claude-flow__agent_spawn { type: "reviewer", name: "quality-checker" }

Memory Coordination

// Store conversion configuration
mcp__claude-flow__memory_usage {
  action: "store",
  key: "cad/conversion/config",
  namespace: "cad",
  value: JSON.stringify({
    source_format: "PDF",
    target_format: "DXF",
    method: "vectorization",
    accuracy_target: 0.95
  })
}

Best Practices

Format Selection

STEP: Best for 3D geometry exchange
IGES: Legacy support, use STEP when possible
DXF: Best for 2D CAD interoperability
STL: 3D printing and visualization only

Conversion Quality

Always verify dimensional accuracy after conversion
Check for missing entities (arcs, splines, text)
Validate layer structure preservation
Test with small sample before batch processing

Automation

Use Python scripting for repeatable tasks
Create conversion templates for standard workflows
Implement quality checks in CI/CD pipelines
Document conversion parameters for reproducibility

Common Issues

Lossy Conversions

# Check for conversion losses
losses = converter.check_losses(
    original="model.step",
    converted="model.iges"
)

if losses["geometry_count_diff"] > 0:
    print(f"Lost {losses['geometry_count_diff']} entities")
if losses["accuracy_loss"] > 0.01:
    print(f"Accuracy loss: {losses['accuracy_loss']*100:.1f}%")

Version Compatibility

# Check format version before conversion
info = converter.get_format_info("drawing.dwg")
print(f"DWG Version: {info['version']}")
print(f"Created By: {info['application']}")
print(f"Compatible With: {info['compatible_versions']}")

Related Skills

freecad-automation - FreeCAD operations
gmsh-meshing - Mesh generation from CAD
orcaflex-modeling - Marine analysis integration
structural-analysis - FEM preprocessing

References

DWG/DXF Specification: Open Design Alliance
STEP Standard: ISO 10303
IGES Standard: ASME Y14.26M
Agent Configuration: agents/cad-engineering-specialist/agent.yaml

Version History

1.0.0 (2025-01-02): Initial release from agents/cad-engineering-specialist/ configuration