# ANSI B29.1 #40 & #35 Roller-Chain Sprocket .DXF Generator

Generate exact ANSI B29.1 #25, #35, #40, #50, and #60 roller-chain sprocket tooth seating curves and topping arcs for CNC laser, waterjet, and plasma cutting.

## Engineering Geometry & Export Specification
- Implements true ANSI B29.1 roller seating curve radius Ri = 0.5025*Dr + 0.038mm and seating angle A = 35° + 60°/N for smooth roller engagement.
- 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/ansi-40-35-chain-sprocket-dxf-generator.html