# Internal Involute Ring Gear & Epicyclic Housing .DXF/.STL

Generate internal involute ring gears with housing outer diameter, inward addendum clearance, and matching planet/pinion gears for compact drives.

## Engineering Geometry & Export Specification
- Generates inward-facing internal gear pockets with tip interference relief for 3D-printed robotic actuators and CNC ring housings.
- CAD Outputs: 0.005mm AutoCAD R12 `.DXF`, `.SVG`, Watertight 3D Binary `.STL` (4–40mm face + hub boss + bore), and `1:1` Printable `.PDF`.
- Pricing: Free Spec Proof PDF ($0) · Single CAD Pack ($11.90) · Mechanical Engineer Pro ($19.00/mo).
- Live Interactive Workbench: https://gearcadpro.com/templates/internal-ring-gear-dxf-stl-generator.html