Kinking can be prevented by proper uncoiling andunreeling methods and by the correct handling of therope throughout its installation.Drum WindingSpooling wire rope on a crane hoist drum causes aslight rotating tendency of the rope due to the spiral layof the strands. Two types of hoist drums used forspooling wire rope are as follows:1. Grooved drum. When grooved drums are used,the grooves generally give sufficient control to wind thewire rope properly, whether it is right or left lay rope.2, Smooth-faced drum. When smooth-faced drumsare used, where the only other influence on the wire ropein winding on the first layer is the fleet angle, the slightrotational tendency of the rope can be used as anadvantage in keeping the winding tight and uniform.NOTE: Using the wrong type of wire rope laycauses the rotational tendency of the rope to be adisadvantage, because it results in loose and nonuniformwinding of the rope on the hoist drum.Figure 13-15 shows drum winding diagrams forselection of the proper lay of rope. Standing behind thehoist drum and looking toward an oncoming overwindrope, the rotating tendency of right lay rope is towardthe left; whereas, the rotating tendency of a left lay ropeis toward the right.Refer to figure 13-15. With overwind reeving and aright lay rope on a smooth-faced drum, the wire ropebitter end attachment to the drum flange should be at theleft flange. With underwind reeving and a right lay rope,the wire rope bitter end attachment should beat the rightflange.When wire rope is run off one reel onto another oronto a winch or drum, it should be run from TOP TOFigure 13-15.—Different lays of wire rope winding on hoist drums.13-7
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