Gear Parameters
Profile Shift Coefficients
Positive shift (x > 0) strengthens the tooth and avoids undercut. Standard gears use x = 0. Minimum to avoid undercut at 20°: x_min = (17 − z) / 17.
Undercut Check
Min Shift Pinion x₁_min
Min Shift Gear x₂_min
Sum of Coefficients x∑
Pinion Undercut
Gear Undercut
Modified Gear Pair
Standard Centre Distance a
mm
Working Pressure Angle αw
°
Modified Centre Distance a'
mm
Centre Distance Increment Δa
mm
Working PCD (Pinion) dw₁
mm
Working PCD (Gear) dw₂
mm
Modified Diameters
Pinion Tip Dia da₁
mm
Gear Tip Dia da₂
mm
Pinion Root Dia df₁
mm
Gear Root Dia df₂
mm
Base Circle Dia (Pinion) db₁
mm
Base Circle Dia (Gear) db₂
mm
Contact Ratio εα