TM5-3810-305-10
Drums. Plain (Smooth)
Installation of a wire rope on a plain (smooth)
face drum requires a great deal of care. The
starting position should be at the drum end so
that each turn of the rope will wind tightly
against the preceding turn (Figure 4-40). Close
supervision should be maintained all during
installation. This will insure the following:
1. The rope will be properly attached to the
drum.
USE RIGHT LAY ROPE
RIGHT LAY OVERWOUND
3.
4.
Each turn will be guided as close to the pre-
ceding turn as possible, so that there are no
gaps between turns.
There will beat least two dead turns on the
drum when the rope is fully unwound during
normal operating cycles.
By holding the right or left hand with index
finger extended, palm up or palm down, the
proper procedure for installing left and right lay
rope on a smooth drum can be easily determined.
OVERWIND RIGHT TO LEFT
USE LEFT LAY ROPE
UNDERWIND RIGHT TO LEFT
USE RIGHT LAY ROPE
LEFT LAY OVERWOUND
ROPE AT
FLANGE
L
RIGHT LAY UNDERWOUND
Figure 4-40 Drum Winding and Appropriate Hand Signals
Flexibility of Wire Rope
flexible fiber core rope. The reason for this lies
The term flexibility is frequently thought of as
in the ability of IWRC rope to retain its round-
being synonymous with resistance to bending
ness and freedom of internal movement. Under
fatigue. This is not true. Flexibility refers to the
the same conditions, a fiber core rope will flatten
capability of flexing or bending. While a high
and inhibit free internal adjustment, thereby
degree of fatigue resistance may sometimes
leading to early failure.
accompany the flexibility characteristic, it does
not necessarily follow that this is so. A fiber
As noted earlier, a design choice is almost
core rope, for example, is more flexible than an
invariably the result of compromise. Ultimately,
IWRC rope. Yet, when the IWRC rope is bent
what is sought is an efficient, economical solu-
around undersize sheaves at relatively high loads,
tion; hence, whatever the compromise, it must
it will usually perform better than the more
help achieve this goal.
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