Plow Steel Wire RopePlow steel wire rope is unusually tough and strong.This steel has a tensile strength of 220,000 to 240,000psi. Plow steel wire rope is suitable for hauling, hoisting,and logging.Improved Plow Steel Wire RopeImproved plow steel wire rope is one of the bestgrades of rope available and is the most common ropeused in the NCF. This type of rope is stronger, tougher,and more resistant to wear than either mild plow steelor plow steel. Each square inch of improved plow steelcan stand a strain of 240,000 to 260,000 pounds. Thismakes it especially useful for heavy-duty service, suchas on cranes with excavating and weight-handlingattachments.LAYS OF WIRE ROPEThe term lay refers to the direction of the twist ofthe wires in a strand and to the direction that the strandsare laid in the rope. In some instances, both the wires inthe strand and the strands in the rope are laid in the samedirection; and in other instances, the wires are laid inone direction and the strands are laid in the oppositedirection, depending on the intended use of the rope.Most manufacturers specify the types and lays of wirerope to be used on their piece of equipment. Be sure andconsult the operator’s manual for proper application.Five different lays of wire rope are shown in figure13-4.The five types of lays used in wire rope are asfollows:.Right Regular Lay: In right regular lay rope, thewires in the strands are laid to the left, while the strandsare laid to the right to form the wire rope..Left Regular Lay: In left regular lay rope, thewires in the strands are laid to the right, while the strandsare laid to the left to form the wire rope. In this lay, eachstep of fabrication is exactly opposite from the rightregular lay..Right Lang Lay: In right lang lay rope, the wiresin the strands and the strands in the rope are laid in thesame direction; in this instance, the lay is to the right..Left Lang Lay: In left lang lay rope, the wires inthe strands and the strands in the rope are also laid in thesame direction; in this instance, the lay is to the left(rather than to the right as in the right lang lay).Figure 13-4.—Lays of wire rope..Reverse Lay: In reverse lay rope, the wires inone strand are laid to the right, the wires in the nearbystrand are laid to the left, the wires in the next strand areto the right, and so forth, with alternate directions fromone strand to the other. Then all strands are laid to theright.LAY LENGTH OF WIRE ROPEThe length of a rope lay is the distance measuredparallel to the center line of a wire rope in which a strandmakes one complete spiral or turn around the rope. Thelength of a strand lay is the distance measured parallelto the center line of the strand in which one wire makesone complete spiral or turnaround the strand. Lay lengthmeasurement is shown in figure 13-5.Figure 13-5.—Lay length of wire rope.13-3
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