STRENGTH OF WIRE ROPE
in tons of 2,000 pounds
| Diameter in Inches | Wire Transmission Rope. One Hemp core surrounded by six strands of seven wires each. | |||
|---|---|---|---|---|
| Iron | Crucible Cast Steel | Extra Strong Crucible Cast Steel | Plow Steel | |
| 2 3⁄4 | ||||
| 2 1⁄2 | ||||
| 2 1⁄4 | ||||
| 2 | ||||
| 1 3⁄4 | ||||
| 1 5⁄8 | ||||
| 1 1⁄2 | 32 | 63 | 73 | 82 |
| 1 3⁄8 | 28 | 53 | 63 | 72 |
| 1 1⁄4 | 23 | 46 | 54 | 60 |
| 1 1⁄8 | 19 | 37 | 43 | 47 |
| 1 | 15 | 31 | 35 | 38 |
| 7⁄8 | 12 | 24 | 28 | 31 |
| 3⁄4 | 8.8 | 18.6 | 21 | 23 |
| 5⁄8 | 6 | 13 | 14.5 | 16 |
| 9⁄16 | 4.8 | 10 | 11 | 12 |
| 1⁄2 | 3.7 | 7.7 | 8.85 | 10 |
| 7⁄16 | 2.6 | 5.5 | 6.25 | 7 |
| 3⁄8 | 2.2 | 4.6 | 5.25 | 5.9 |
| 5⁄16 | 1.7 | 3.5 | 3.95 | 4.4 |
| 9⁄32 | 1.2 | 2.5 | 2.95 | 3.4 |
| 1⁄4 | ||||
| Diameter in Inches | Wire Transmission Rope. One Hemp core surrounded by six strands of nineteen wires each. | |||
| Iron | Crucible Cast Steel | Extra Strong Crucible Cast Steel | Plow Steel | |
| 2 3⁄4 | 111 | 211 | 243 | 275 |
| 2 1⁄2 | 92 | 170 | 200 | 229 |
| 2 1⁄4 | 72 | 133 | 160 | 186 |
| 2 | 55 | 106 | 123 | 140 |
| 1 3⁄4 | 44 | 85 | 99 | 112 |
| 1 5⁄8 | 38 | 72 | 83 | 94 |
| 1 1⁄2 | 33 | 64 | 73 | 82 |
| 1 3⁄8 | 28 | 56 | 64 | 72 |
| 1 1⁄4 | 22.8 | 47 | 53 | 58 |
| 1 1⁄8 | 18.6 | 38 | 43 | 47 |
| 1 | 14.5 | 30 | 34 | 38 |
| 7⁄8 | 11.8 | 23 | 26 | 29 |
| 3⁄4 | 8.5 | 17.5 | 20.2 | 23 |
| 5⁄8 | 6 | 12.5 | 14 | 15.5 |
| 9⁄16 | 4.7 | 10 | 11.2 | 12.3 |
| 1⁄2 | 3.9 | 8.4 | 9.2 | 10 |
| 7⁄16 | 2.9 | 6.5 | 7.25 | 8 |
| 3⁄8 | 2.4 | 4.8 | 5.30 | 5.75 |
| 5⁄16 | 1.5 | 3.1 | 3.50 | 3.8 |
| 9⁄32 | ||||
| 1⁄4 | 1.1 | 2.2 | 2.43 | 2.65 |
SPLICING TRANSMISSION CABLES
Wherever wire rope transmissions are used it is necessary to splice the rope or cable so that it will run smoothly over the sheave wheels. For this purpose a long splice is invariably used. (Taken from “American Wire Rope” published by American Steel and Wire Company). The tools required are a small marlin-spike, nipping cutters, and either clamps or a small hemp rope sling with which to wrap around and untwist the rope. If a bench vise is accessible, it will be found very convenient for holding the rope.
“In splicing a rope, a certain length is used up in making the splice. An allowance of not less than 16 feet for ½ inch rope, and proportionately longer for larger sizes, must be added to the length of an endless rope, in ordering. The length of splice relation to the diameter of the rope is approximately 50:1.”
This extra length is equal to the distance EE´ in [Fig. 117]. The additional length recommended for making a splice in different sizes of wire rope is as follows: