z
1
=
z
2
=
β
m
=
grade
m
e
=
mm
Ψ
d
=
r
c
=
mm
z
c
=
Parametri geometrici principali
δ
1
=
grade
m
mt
=
mm
b
=
mm
R
e
=
mm
R
m
=
mm
d
e1
=
mm
d
m1
=
mm
d
e2
=
mm
d
m2
=
mm
m
mn
=
mm
δ
c
=
grade
ρ =
mm
φ
e
=
grade
β
e
=
grade