AGMA Gear Tooth Bending Calculator

Simplified Lewis-form bending stress check at the gear tooth root.

Tangential load Wt (N)Face width F (mm)Module m (mm)Lewis form factor YVelocity factor KvCalculate

Equation

σ = (Wt × Kv) / (F × m × Y)

Assumptions

Simplified Lewis approach — full AGMA 2001 includes additional load-distribution, size, rim-thickness and stress-cycle factors not modelled here.