# /mechanical/drawings

2D technical drawings and specifications for all mechanical components.

## Purpose
This directory contains 2D technical drawings, specifications, and documentation for manufacturing, assembly, and quality control of all mechanical components and sub-assemblies.

## Drawing Organization
Organize drawings by type and sub-assembly:

```
drawings/
├── assembly-drawings/          # Overall system and sub-assembly drawings
│   ├── main-assembly-drawing.pdf
│   ├── pcb-mount-assembly.pdf
│   ├── sensor-housing-assembly.pdf
│   └── connector-panel-assembly.pdf
├── detail-drawings/            # Individual part drawings
│   ├── machined-parts/
│   ├── sheet-metal-parts/
│   ├── molded-parts/
│   └── standard-hardware/
├── interface-drawings/         # Mating part specifications
│   ├── pcb-interface-spec.pdf
│   ├── connector-interface-spec.pdf
│   ├── mounting-interface-spec.pdf
│   └── cable-interface-spec.pdf
└── manufacturing-drawings/     # Fabrication specifications
    ├── machining-drawings/
    ├── sheet-metal-drawings/
    ├── molding-drawings/
    └── 3d-printing-drawings/
```

## Drawing Types

### Assembly Drawings
- **Overall Assembly**: Complete system with all sub-assemblies
- **Sub-Assembly**: Individual functional groups
- **Exploded Views**: Component relationships and assembly sequence
- **Section Views**: Internal construction and interfaces
- **Installation Drawings**: Mounting and positioning requirements

### Detail Drawings
- **Part Drawings**: Individual component specifications
- **Fabrication Drawings**: Manufacturing process details
- **Inspection Drawings**: Quality control and measurement points
- **Modification Drawings**: Engineering changes and updates

### Interface Drawings
- **Mechanical Interfaces**: Mating surfaces and clearances
- **Electrical Interfaces**: Connector positions and orientations
- **Thermal Interfaces**: Heat transfer surfaces and requirements
- **Fluid Interfaces**: Sealing and flow requirements

## Drawing Standards

### Dimensioning and Tolerancing
- **GD&T**: Geometric dimensioning and tolerancing per ASME Y14.5
- **Critical Dimensions**: Identify key functional dimensions
- **Tolerance Stack-up**: Analysis of cumulative tolerances
- **Inspection Requirements**: Measurement methods and equipment

### Drawing Format
- **Title Block**: Part number, revision, date, approvals
- **Drawing Scale**: Appropriate scale for clarity
- **View Selection**: Minimum views to fully define geometry
- **Section Views**: Internal features and construction
- **Detail Views**: Enlarged views of critical features

### Material Specifications
- **Material Callouts**: Specific material grades and specifications
- **Heat Treatment**: Required thermal processing
- **Surface Finish**: Roughness and appearance requirements
- **Coating/Plating**: Protective and decorative finishes
- **Hardware Specifications**: Fastener grades and specifications

## Manufacturing Information

### Machining Drawings
- **Setup Instructions**: Workholding and fixturing requirements
- **Tool Requirements**: Cutting tools and parameters
- **Inspection Points**: Critical dimensions and tolerances
- **Surface Finish**: Machining quality requirements

### Sheet Metal Drawings
- **Bend Allowances**: Material deformation calculations
- **Forming Operations**: Bending, punching, and cutting sequences
- **Weld Symbols**: Welding specifications and requirements
- **Finishing Operations**: Deburring, cleaning, and coating

### Molding Drawings
- **Draft Angles**: Mold release requirements
- **Parting Lines**: Mold separation surfaces
- **Gate Locations**: Material injection points
- **Ejector Pin Locations**: Part removal mechanisms

### 3D Printing Drawings
- **Print Orientation**: Optimal build direction
- **Support Requirements**: Support material locations
- **Post-Processing**: Required finishing operations
- **Material Specifications**: Filament or resin requirements

## Quality Control

### Inspection Drawings
- **Measurement Points**: Critical dimension locations
- **Inspection Methods**: Required measurement techniques
- **Acceptance Criteria**: Pass/fail specifications
- **Documentation Requirements**: Inspection record keeping

### Testing Specifications
- **Functional Testing**: Performance verification requirements
- **Environmental Testing**: Temperature, humidity, vibration
- **Durability Testing**: Lifecycle and wear requirements
- **Safety Testing**: Regulatory compliance verification

## File Management

### Drawing Revisions
- **Revision Control**: Systematic revision tracking
- **Change Documentation**: Engineering change orders (ECOs)
- **Approval Process**: Design review and sign-off procedures
- **Distribution Control**: Controlled document distribution

### File Formats
- **PDF**: Standard format for manufacturing and inspection
- **DWG/DXF**: CAD-compatible formats for editing
- **Native CAD**: Original drawing files for modifications
- **Archive Formats**: Long-term storage and retrieval

## Documentation Standards
- **Drawing Numbers**: Systematic part numbering system
- **Revision Letters**: Alphabetical revision tracking
- **Date Formats**: Consistent date representation
- **Approval Signatures**: Required design approvals
- **Distribution Lists**: Controlled document recipients