Kinking can be prevented by proper uncoiling and
unreeling methods and by the correct handling of the
rope throughout its installation.
Drum Winding
Spooling wire rope on a crane hoist drum causes a
slight rotating tendency of the rope due to the spiral lay
of the strands. Two types of hoist drums used for
spooling wire rope are as follows:
1. Grooved drum. When grooved drums are used,
the grooves generally give sufficient control to wind the
wire rope properly, whether it is right or left lay rope.
2, Smooth-faced drum. When smooth-faced drums
are used, where the only other influence on the wire rope
in winding on the first layer is the fleet angle, the slight
rotational tendency of the rope can be used as an
advantage in keeping the winding tight and uniform.
NOTE: Using the wrong type of wire rope lay
causes the rotational tendency of the rope to be a
disadvantage, because it results in loose and nonuniform
winding of the rope on the hoist drum.
Figure 13-15 shows drum winding diagrams for
selection of the proper lay of rope. Standing behind the
hoist drum and looking toward an oncoming overwind
rope, the rotating tendency of right lay rope is toward
the left; whereas, the rotating tendency of a left lay rope
is toward the right.
Refer to figure 13-15. With overwind reeving and a
right lay rope on a smooth-faced drum, the wire rope
bitter end attachment to the drum flange should be at the
left flange. With underwind reeving and a right lay rope,
the wire rope bitter end attachment should beat the right
flange.
When wire rope is run off one reel onto another or
onto a winch or drum, it should be run from TOP TO
Figure 13-15.—Different lays of wire rope winding on hoist drums.
13-7
