Operation
Version 1.0.2 - 2020-07-20
39
Translation of original instruction
TM3310 | TM3310D
EN
T
M
3310_
GB_4
.f
m
The calculated value "Vr" is the offset measure of the tailstock. The offset is monitored with the
gauge (also the return travel).
For this type of cone machining the lowest speed is used !
Annotation:
In order to check the position of the tailstock axis to the rotation axis, a shaft with two cente-
ringsis clamped between the points. The stand with the gauge is put on the bedslide. The gau-
ge is aligned 90° to the rotation axis and horizontally brought into contact with the shaft. The
gauge will pass along the shaft with the bedslide. There must not be any travel of the pointer
along the whole length of the shaft. If a deviation is being shown, the tailstock is to be cor-
rected.
Fig.4-12:
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 40
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:
Calculation:
or
The tailstock offset must not exceed the value
"Vrmax"
as the workpiece
tumbles!
Example:
Kv = 1 : 40 ; Lw = 150 mm ; L = 100 mm
Vr =
Lw
2 x Kv
Vr =
D - d
2 x L
x Lw
Vr
max
=
Lw
50
Vr =
150
2 x 40 1.875 mm
Vr
max
=
150
50
3 mm
n =
Vc x 1000
d x 3.14
