narrowest point-should not exceed 15% over normal not should twisting be greater
than 10°.
11. Peening
Continuous pounding is one of the causes of peening. The rope strikes against an
object such as some structural part of the machine, or it beats between the rope and
the object it is striking. Another common cause of peening is continuous passage-
under high tension-over a sheave or drum. Where peening action cannot be
controlled, it is necessary to have more frequent inspections and to be ready for earlier
rope replacement.
Figure 36 shows the external appearance of two ropes, one of which has been
abraded (1) and the other peened (2). Also shown are the cross-section of both wires
in these conditions.
319REVISED:
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