Operating Manual
Tangential Rolling System T18F - T27F
23
www.lmt-fette.com
5.2
Installation on the machine tool
5.2.1
Preparing the workpiece
To ensure optimum true-running, the workpiece has to be pre-machined and cham-
fered in the same clamping immediately before rolling. Figure 12 shows pre-machined
workpieces. The version with thread undercut is recommended. In such case, the
undercut width g
2
should be as per DIN 76-A (see also 3.5).
g
2
D
B
γ
γ
γ
d
i
d
A
d
i
d
A
Figure 12: Pre-machining of workpiece
The blank diameter d
A
of the thread to be rolled is similar to the pitch diameter d
2
:
d
A
= d
2
– 0.3 mm [mm]
Upward or downward deviations may be necessary due to the flow behavior of the
material or due to the special tolerance position of the thread. Note the following when
adjusting the blank diameter: in Figure 13 the areas 1 and 2 are equal in size. Conse-
quently, an increase of the blank diameter d
A
by
Δ
d
A
results in a 3 to 5-fold increase
of the major diameter d
1
by
Δ
d
1
. A change of
Δ
d
A
= 0.01 mm
l
0.0004 inch leads to an
major diameter increased by 0.05 mm
l
0.002 inch.
2
1
∆
d
∆
d
A
d
A
d
Figure 13: Change of the blank diameter
LMT_Bedienungsanleitung_T18F_T27F_e.indd 23
02.08.11 17:40