Figure 5-23. - The correct way to remove a loop in a wire rope
Figure 5-24. - A wire rope kink.
Figure 5-25. - Kink damage.
The chart shown in table 5-1 can be used to determine the minimum sheave diameter for wire rope of various diameters and construction.
The makers of wire rope are careful to lay each wire in the strand and each strand in the rope under uniform tension. When the ends of the rope are not
Table 5-1. - Suggested Mininum Tread Diameter of sheaves and Drums
secured properly, the original balance of tension is disturbed and maximum service cannot be obtained because some strands can carry a greater portion of the load than others. Before cutting steel wire rope, place seizing on each side of the point where the rope is to be cut, as shown in figure 5-26.
A rule of thumb for determining the size, number, and distance between seizing is as follows:
1. The number of seizing to be applied equals approximately three times the diameter of the rope.
Example: 3- x 3/4-inch-diameter rope = 2 1/4 inches. Round up to the next higher whole number and use three seizings.
2. The width of each seizing should be 1 to 1 1/2 times as long as the diameter of the rope.
Example: 1- x 3/4-inch-diameter rope= 3/4 inch. Use a 1-inch width of seizing.
3. The seizing should be spaced a distance equal to twice the diameter of the wire rope.
Example: 2- x 3/4-inch-diameter rope = 1 1/2 inches. Space the seizing 2 inches apart.
A common method used to make a temporary wire rope seizing is as follows:
Wind on the seizing wire uniformly, using tension on the wire. After taking the required number of turns, as shown in step 1, twist the ends of the wiresContinue Reading