# 4-Planet Symmetric High-Torque Planetary Gearbox .DXF/.STL

Design 4-planet load-sharing epicyclic gear stages satisfying (Zs + Zr) mod 4 = 0 for high-torque robotic joints and electric winch drives.

## Engineering Geometry & Export Specification
- Verifies 4-way symmetric tooth phasing (20 + 60)/4 = 20 and checks chordal tip clearance between all four planet gears.
- 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/epicyclic-4-planet-high-torque-gearbox-cad.html