Technical data, Turning, Terminology and units – Sandvik Coromant Heat resistant super alloys User Manual
Page 120: Formulas
118
Turning
D
m
= Machined diameter
mm
v
c
= Cutting speed
m/min
n = Spindle speed
r/min
T
c
= Machining time
min
Q = Metal removal rate
cm
3
/min
l
m
= Machined length
mm
P
c
= Net power
kW
k
c
0,4
= Specific cutting force for chip
N/mm
2
thickness 0.4 mm
f
n
= Feed per revolution
mm/r
κ
r
= Entering angle
degree
R
max
= Profile depth
µm
r
ε
= Insert nose radius
mm
a
p
= Depth of cut
mm
h
ex
= Max chip thickness
mm
SCL = Spiral Cutting Length
m
Terminology and units
SCL (Spiral Cutting Length) – input info in mm – result in m
External or internal turning
Facing
Taper cutting
How to calculate: l
m2
Formulas
Cutting speed (m/min)
Spindle speed (r/min)
Metal removal rate
(cm
3
/min)
Machining time (min)
Power requirement (kW)
Profile depth (
µm)
max
Max chip thickness
Constant n
Insert shapes:
C, D, S, T, V, W
Round inserts
Machining time (min)
Technical data
SCL =
D
m
x
π x l
m
1000
f
n
SCL =
D
m1
+D
m2
x π x l
m1
2
1000 f
n
(
)
SCL =
D
m1
+D
m2
x π x l
m2
2
1000 f
n
(
)
l
m2
=
√
(l
m1
)
2
+
(
D
m1
- D
m2
)
2
2
v
c
=
D
m
× π × n
1000
n =
v
c
× 1000
π × D
m
Q = v
c
× a
p
× f
n
P
c
=
v
c
× a
p
× f
n
× k
c 0.4
0.4
0.29
60
× 10
3
f
n
×
sin
κ
r
R
=
f
n
2
× 125
r
ε
h
ex
=
f
n
× sin
κ
r
h
ex
=
f
n
×
√
4a
p
–
(
2a
p
)
2
SCL
v
c
T
c
=
iC iC
T
c
=
l
m
f
n
× n