Page 575 - Ceratizit Catalog

Formula collection
B248
Formulas - helical milling

Helical milling - external
Feed rate (speed at centre of milling cutter)
Calculation example:

d 1
v f = (1+ )n·f ·z
z
D w Cutter type: ... C210.25.R.04
Cutter diameter d : ... 25 mm
1
Number of teeth z: ... 4
Machined diameter D : ... 45 mm
w
Blank diameter D : ... 50 mm
Actual depth of cut a
Rev number n: ... 2500 rpm
2 2 Feed per tooth f : ... 0.05 mm
a
D- D w z
a e =
4 (D+ d)
1
w
Feed rate:
25
a e
v f = (1+ ) 2500 0,05 4 = 777 mm/min
45
f Z
∼
D w
Radial depth of cut:
(50- 45)/2= 2,5 mm
n
Effective radial depth of cut:
D a
2
50 -45 2
a e = = 1,7 mm
V f
4 (45+ 25)
Helical milling - internal
Feed rate (speed at centre of milling cutter)
Calculation example:
d 1
v f = (1- )n·f ·z
z
D w Cutter type: ... C210.25.R.04
Milling cutter diameter d : ... 25 mm
1
Number of teeth z: ... 4
Machined diameter D : ... 50 mm
w
Blank diameter D : ... 45 mm
Actual depth of cut a
Rev number n: ... 2500 rpm
2 2 Feed per tooth f : ... 0.05 mm
w
D- D a z
a e =
4 (D+ d)
w
1
Feed rate:
25
v f = (1- ) 2500 0,05 4 = 250 mm/min
a e 50
n
Radial depth of cut:
Milling / Technical information
(50- 45)/2= 2,5 mm
D a
v f
D W
Effective radial depth of cut:
2
50 -45 2
∼ f Z a e = = 4,75 mm
4 (50- 25)