correction factor K
S
tot
σ
FP
/ σ
F lim
= (Y
ST
· Y
NT
· Y
δ
·Y
R
·Y
X
) / S
F
Y
ST
stress correction factor, relative with refference gears
Y
NT
life factor for tooth-root stress for reference test cond.
Y
δ
notch sensitivity factor relative to polished test piece.
Y
R
relative roughness factor.
Y
X
size factor
S
F
factor for savety from tooth breakage
σ
FP
/ σ
F lim
= (Y
ST
· Y
NT
· Y
δ
·Y
R
·Y
X
) / S
F
enter new value in the main program window manually !
σ
F lim
= nominal tooth-root stress reference gears (fatique).
σ
FP
= permissable tooth-root stress actual gears.