LAY LENGTH OF WIRE ROPE

The length of a wire rope lay is the distance measured parallel to the center line of a wire rope in that a strand makes one complete spiral or turn around the rope. The length of a strand lay is the distance measured parallel to the centerline of the strand in that one wire makes one complete spiral or turnaround the

Figure 5-4.-Lays of wire rope.

strand. Lay length measurement is shown in figure 5-5.

CLASSIFICATION OF WIRE ROPE

The primary types of wire rope used by the NCF consist of 6, 7, 12, 19, 24, or 37 wires in each strand. Usually, the wire rope has six strands laid around the core .

The two most common types of wire rope, 6 by 19 and 6 by 37, are shown in figure 5-6. The 6 by 19 type (having six strands with 19 wires in each strand) is the stiffest and strongest construction of the type of wire rope suitable for general hoisting operations. The 6 b y 37 wire rope (having six strands with 37 wires in each strand) is flexible, making it suitable for cranes and similar equipment where sheaves are smaller than

Figure 5-5.-Lay length of wire rope.

Figure 5-6.-A. 6 by 19 wire rope; B. 6 by 37 wire rope.

usual. The wires in the 6 by 37 are smaller than the wires in the 6 by 19 wire rope and, consequently, will not stand as much abrasive wear.

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