Sandvik Coromant Threading - Manual (Page 117)

117
D
vf
= D
m
-D
c
D
vf1 =
D
vf
2
eff
f
z
=
sin

v
fm
= n × f
z
× z
c
h
ex

= arccos 1 -
D
cap
v
f
=
v
fm
× (D
m
+ D
cap
)
D
m


D
w
2 – D
m
2
4 (D
m
+ D
cap
)
a
e eff
=
2 × a
e eff
v
fm
= n × f
z
× z
c
v
f
=
v
fm
× (D
m
– D
cap
)
D
m
D
m
2 – D
w
2
4 (D
m
– D
cap
)
f
z
= =
sin

h
ex
h
ex
√
1 – cos2


= arccos 1 -
D
cap


2 × a
e eff
a
e eff
=
v
c
=
D
cap
 π 
n
1000
5. Technical reference
Thread milling formulas
Calculated version
Internal thread milling
Peripheral feed
(mm/min)
Tool centre feed
(mm/min)
Radial depth of cut
(mm)
Feed per tooth
(mm)
Thread milling with a
roll into cut tool path,
D
vf1
Calculated version
Peripheral feed
(mm/min)
Tool centre feed
(mm/min)
Feed per tooth
(mm)
Cutting speed (v
c
)
(m/min)
External thread milling
Thread milling