
Operation
Version 1.1.6 - 2021-9-17
41
Translation of original instruction
TU3008G
GB
T
U
3008G
_GB
_4.
fm
Img.4-17: Workpiece between centres: Tailstock offset Vr
4.15
Standard values for cutting data when turning
The better the cutting data are selected, the better the turning result. Some standard values for
cutting speeds of different materials are listed on the following pages.
Cutting speed table on page 41
Criteria of the cutting conditions:
Cutting speed: Vc (m/min)
Depth of cut: ap (mm)
Infeed: f (mm/rev)
Cutting speed:
In order to get the speed for the machine settings of the selected cutting speeds the following
formula is to be applied:
Speed: n (rpm)
Workpiece diameter: d (mm)
For lathes without continuously adjustable drive (V-belt drive, speed gear) the nearest speed is
being selected.
Cutting depth:
In order to achieve a good chipping, the results of the depth of cut divided by the feed shall
result in a figure between 4 and 10.
Example: ap = 1.0 mm; f = 0.14 mm/rev ; and this equals to in a value of 7.1 !
Feed:
The feed for rough turning is to be selected in a way that it does not exceed half the value of the
corner radius.
Example: r = 0.4 mm ; equals to fmax. = 0.2 mm/rev !
For planing/turning the infeed should be maximum 1/3 of the corner radius.
Example: r = 0.4 mm ; equals to fmax. = 0.12 mm/rev !
4.16
Cutting speed table
n =
Vc x 1000
d x 3.14
Turning
Drilling
Materials
Cutting materials
HSS
P10
P20
P40
K10
HC
P40
HC
K15
HC
M15/
K10
HSS
non-alloyed steel; steel casting;
C45; St37
35 -
- 50
100 -
- 150
80 -
- 120
50 -
- 100
-
-
70 -
- 180
150 -
- 300
90 -
- 180
30 -
- 40