“In wire drawing mills, although generally making use of multi-pass drawing machines,
sometimes it happens that one or several of the last draws are made on another
drawing machine, which leads to a change in the direction of drawing.
Normally, we do not pay attention to this fact in industrial practice, but the change of
drawing direction has an essential influence which decreases the fatigue strength of
wires, as the research shows (Hankus, 2000).
The work reported here describes tests on the mechanical properties of wires and
ropes made from those wires, which were drawn with and without the change of
drawing direction in the last draw.
The major finding is a 24% decrease in the fatigue strength of ropes made from wires
manufactured with a change of drawing direction in their production.”