Profile Shift (Addendum Modification)
x-coefficients → modified center distance, working pressure angle, tip/root diameters, contact ratio
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
—