Machinery's Handbook, 31st Edition
Wire Rope
2717
Fig. 4a. 8 × 25 Filler Wire with Fiber Core Fig. 4d. 8 × 19 Seale with Fiber Core Also in this class, but not shown in Table 4, are elevator ropes made of traction steel and iron. Fig. 4b. 8 × 19 Warrington with Fiber Core Fig. 4c. 8 × 21 Filler Wire with Fiber Core 18 × 7 Non-rotating Wire Rope: This rope is specially designed for use where a minimum of rotating or spinning is called for, especially in the lifting or lowering of free loads with a single-part line. It has an inner layer composed of 6 strands of 7 wires each laid in left Lang lay over a fiber core and an outer layer of 12 strands of 7 wires each laid in right regular lay. The combination of opposing lays tends to prevent rotation when the rope is stretched. However, to avoid any tendency to rotate or spin, loads should be kept to at least one-eighth and preferably one-tenth of the breaking strength of the rope. Weights and strengths are shown in Table 5. Table 5. Weights and Strengths of Standard 18 × 7 Nonrotating Wire Rope, Preformed and Not Preformed
Recommended Sheave and Drum Diameters Single layer on drum 36 rope diameters Multiple layers on drum 48 rope diameters Mine service 60 rope diameters
Fig. 5. 18 × 7 Non-Rotating Rope
Breaking Strength, Tons of 2000 Lbs.
Breaking Strength, Tons of 2000 Lbs.
Approx. Weight per Ft., Pounds
Approx. Weight per Ft., Pounds
Impr. Plow Steel 1.42 2.51 3.90 5.59 7.58 9.85
Impr. Plow Steel 29.5 38.3 48.2 59.2 71.3 84.4 98.4
Dia., Inches
Plow Steel
Dia., Inches
Plow Steel 25.7 33.3 41.9 51.5 62.0 73.4 85.6 98.8
0.061 0.108 0.169 0.24 0.33 0.43 0.55 0.68 0.97
1.24 2.18 3.39 4.86 6.59 8.57
1.32 1.73 2.19 2.70 3.27 3.89 4.57 5.30
3 ∕ 16 1 ∕ 4 5 ∕ 16 7 ∕ 16 1 ∕ 2 9 ∕ 16 3 ∕ 8
7 ∕ 8
1
1 1 ∕ 8 1 1 ∕ 4 1 3 ∕ 8 1 1 ∕ 2 1 5 ∕ 8 1 3 ∕ 4
12.4 15.3 21.8
10.8 13.3 19.0
114
5 ∕ 8 3 ∕ 4
… …
…
…
For galvanized ropes, deduct 10 percent from above strengths. Source: Rope diagrams, sheave and drum diameters, and data for 3 ⁄ 16 , 1 ⁄ 4 and 5 ⁄
16 -inch sizes,
Bethlehem Steel Co. All other data, US Simplified Practice Recommendation 198-50. Flattened Strand Wire Rope: The wires forming the strands of this type of rope are wound around triangular centers so that a flattened outer surface is provided with a greater area than in the regular round rope to withstand severe conditions of abrasion. The triangular shape of the strands also provides superior resistance to crushing. Flattened strand wire
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