Operation
Version 1.0 - 2020-12-22
132
Translation of original instruction
TU2506VB
EN
T
U
2506V
B_GB
_4.
fm
Img.4-14: Workpiece between centres: Tailstock offset Vr
4.14
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 132
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 !
4.15
Cutting speed table
Vr =
150
2 x 40 1.875 mm
Vr
max
=
150
50
3 mm
n =
Vc x 1000
d x 3.14
Turning
Drilling
Materials
Cutting materials
