Standard Values For Cutting Data When Turning; Cutting Speed Table - Optimum OPTI turn TU 3008G Operating Manual

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:
Vc x 1000
n =
d x 3.14
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

Materials
non-alloyed steel; steel casting;
C45; St37
Operation
Version 1.1.6 - 2021-9-17
HSS P10 P20 P40
35 - 100 - 80 - 50 -
- 50 - 150 - 120 - 100
Translation of original instruction
Turning
Cutting materials
HC HC
K10
P40 K15
- 70 - 150 -
- - 180 - 300
Drilling
HC
M15/ HSS
K10
90 - 30 -
- 180 - 40
TU3008G GB
41