Section V Wire Rope Instructions

TM-5-3810-305-10 Crane Wheel Mounted Hydraulic Light 7 1/2 Ton (Rough Terrain Crane) Model LRT 110 Manual
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TM5-3810-305-10 Section V Wire Rope Instructions Rope Identification and Construction Wire rope is identified not only by its component parts, but also by its construction, i.e., by the way the wires have been laid to form strands, and by the way the strands have been laid around the core. The following illustration is a comparison of typical wire rope lays (Figure 4-17): D E Figure 4-17. d. Left Lang Lay e. Right Alternate Lay. In Figure 4-17, illustrations (A) and (C) show strands as normally laid into the rope to the right, in a fashion similar to the threading in a right- hand bolt, Conversely, the “left lay” rope strands illustrations (B) and (D) are laid in the opposite direction. Again in Figure 4-17, the first two illustrations (A) and (B) show regular lay ropes. Following these are the types known as lang lay ropes. Note that the wires in regular lay ropes appear to line up with the axis of the rope; in lang lay rope the wires form an angle with the axis of the rope. This difference in appearance is a result of variations in manufacturing techniques: regular lay ropes are made so that the direction of the wire lay in the strand is opposite to the direction of the strand lay in the rope; lang lay ropes (C) and (D) are made with both strand lay and rope lay in the same direction. Finally, the last rope illustrated (E), called alternate lay, consists of alternating regular and lang lay strands. Wire rope nomenclature also defines: length, size (i.e., diameter), type, direction of lay, grade of rope, type of core and whether it is preformed (p/f) or non-preformed (rip/f). If the direction and type of lay are omitted from the rope de- scription, it is presumed to be a right regular lay. In addition, if no mention is made as to pre- forming, this will be presumed as a requirement for preforming. On the other hand, an order for elevator rope requires an explicit statement since p/f and rip/f ropes are used extensively. An example of a complete description would appear thus: 600 ft 3/4 in. 6x25 FW Left lang lay Improved plow IWRC. (Rope described above would be made PRE- FORMED.) There are four basic constructions around which standard wire ropes are built (Figure 4-18): 6x21 SEALE 6x31 WARRINGTON WITH IWRC SEALE WITH IWRC 6x43 FILLER WIRE SEALE 6x46 SEALE FILLER WITH FIBER CORE WIRE WITH IWRC Figure 4-18. Basic Design Construction 4-28 a.Right Regular Lay b. Left Regular Lay c. Right Lang Lay

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