OPTIMUM
M A S C H I N E N - G E R M A N Y
Operation
Version 1.0.1 dated 2015-05-27
Page 47
Original operating instructions
TU3008 | TU3008V
GB
Img.4-19:
Workpiece between points: 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 47
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 (1/min)
Workpiece diameter: d (mm)
For lathes without continuously adjustable drive (V-belt drive, speed gear) the nearest speed is
being selected.
Depth of cut:
In order to achieve a good chipping, the results of the depth of cut divided by the infeed shall re-
sult in a figure between 4 and 10.
Example: ap = 1.0 mm; f = 0.14 mm/U ; and this equals to in a value of 7.1 !
Feed:
The infeed for roughing/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
40
---------------
1 875mm
=
=
Vr
max
150
50
---------
3mm
=
=
n
Vc
1000
d
3 14
-------------------------
=
turning
Drilling
Materials
Cutting materials
