48
ANNEX 6 - CALIBRATING THE TORQUE LIMITER SLIP TORQUE
The torque limiter is an optional device available for worm gear units of the following types: VF 44L, VF 49L,
W 63L, W 75L, W 86L and W 110L.
The device is factory calibrated to a slip torque which coincides with the nominal torque Mn
2
[n
1
= 1400] for
the gear unit in question.
This is achieved as follows. The same operations, with exclusion of step (2), allow the User to calibrate the li-
miter to a torque different to that set in the factory.
1. The calibration ring nut is screwed in until the disk springs are loaded to the point that they cannot be tur-
ned freely by hand.
2. A centre punch is used to make two corresponding reference marks at the same angular position on the
ring nut and the protruding section of the output shaft. This reference position is the starting point from
which all further turns of the ring nut are counted, and thus, the torque calibration is measured.
3. The ring nut is now screwed in by the fractions of a turn which correspond to the nominal torque Mn
2
for
the gear unit in question. The reference in this case is given by the diagram below, which is also to be
used for any new settings required over time.
N° of ring nut turns
Torque [Nm]
0
100
200
300
400
500
600
700
800
900
1000
0
1/4
1/2
3/4
1
1
1/4
1
1/2
1
3/4
2
2
1/4
2
1/2
2
3/4
3
3
1/4
3
1/2
3
3/4
W63
W75
W86
W110
39 Nm
95 Nm
160 Nm
270 Nm
370 Nm
700 Nm
VF49
VF44
Summary of Contents for A 10
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