correction factor KC tot
σHP / σH lim = (ZNT ZL Zv ZR Zw Zx ) / SH
ZNT = 1.1...1.6 life factor for contact stress for reference test conditions
ZL = 0.9...1.1 Lubricant factor.
ZV = 0.9...1.1 Velicity factor
ZR = 0.8...1.1 Roughness factor affecting surface durability
ZW = 1.05...1.25 Work-hardening factor
ZX = 0.7...1.0 Size-factor for pitting.
SH = 1.2 safety factor from pitting.
σHP / σH lim = (ZNT ZL Zv ZR Zw Zx ) / SH  
 enter new value in the main program window manually !  
σH lim = nominal contact stress from test wheels (pitting).
σHP = permissable contact stress actual gears.