# Precision Gear Center Distance & Backlash CAD Calculator

Calculate exact mounting bore center-to-center spacing, radial clearance, and circumferential backlash for CNC gearbox plates and 3D housings.

## Engineering Geometry & Export Specification
- Provides 0.001mm center-distance precision and pitch-circle reference layers for boring mill and CNC router gearbox side plates.
- 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/gear-center-distance-backlash-calculator.html