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Gear Train Design in CAD: AGMA Contact Stress, Lewis Bending & Tooth Undercutting

September 08, 2026 - BY Admin

Gear Train Design in CAD: AGMA Contact Stress, Lewis Bending & Tooth Undercutting

Engineering Durable Industrial Transmissions That Run Quietly Under Load

Drafting spur and helical gear profiles requires more than simple decorative circles. Designing reliable gears demands calculating tooth bending fatigue stresses and surface contact pitting limits.

Essential Gear Engineering Calculations

Mechanical engineers verify tooth geometry to prevent premature gear tooth failure.

  • Involute Tooth Profile Generation: Generating true conjugate gear action to maintain constant transmission velocity ratios.
  • Lewis Bending Equation: Calculating tensile bending stresses at the root fillet of the gear tooth under load.
  • Preventing Pinion Undercutting: Maintaining minimum tooth counts (typically $ge 17$ for $20^circ$ pressure angles) to avoid root thinning.

Master transmission and gear design in the SolidWorks Professional Track.

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