samlet-A5-18 - Flipbook - Side 268
Multiple layers of wire on the drum can cause deformations in the
underlying layers. Incorrect swirling with excessive wiring angle
between wire and drum or loose wire may result in mechanical
influences, eg squeeze and consequent impact loads during work.
Wire drums and wires with a small diameter can cause permanent
deformation of the wire (see Figure 3), which certainly leads to
premature wire failure.
Wire drums and wires with excessive track width - 10% above the
nominal wire diameter - imply that the wire does not get the
necessary support with flare and risk of early wreckage (see Figure
Wire drums and wiper discs with too narrow grooves can cause
impression of the individual threads and deformation of the wire,
which leads to rapid winding of the wire and subsequent wrecking.
Steel wire - disposal basis
The following criteria are - cf. AT message No.2.02.4 - applicable
disposal of steel wire:
1) Railing of the steel wire with more than 10% of its original diameter.
2) Each thread is worn more than 1/3 of the thread diameter.
3) The number of wire breaks at a winding length is more than 10 in any
location on the wire.
4) The steel wire has a kinke - pulled cord.
5) Flat printing of steel wire.
6) The threads in a cord are broken.
7) The individual threads in a cord are bent due to sharp edges.
8) A cord has loosened.
9) The steel wire is damaged by rust - especially notice internal rust attacks.