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The rope is unlayed far enough back to allow the loop or eye to be formed by looping one part in one direction and the Flemish eye spliceother part in the other direction and lay- ing the rope back together. The strands are rolled back around the rope body. The flemish eye splice is fabricated by opening or unlaying the rope body into two parts, one having three strands and the other having the remaining three strands and the core. Should the metal sleeves(s) fail, the entire eye will also fail. A drawback to this type of sling is that the lifting capacity of the sling depends 100% upon the integrity of the pressed or swaged joint. This makes an economical sling and in most cases one that will give satisfactory service. The returned loop is fabricated by forming a loop at the end of the rope, sliding one or more metal sleeves over the short end of the loop eye and pressing these sleeves to secure the end of the rope to the sling body.
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In either case, the splice is com- pleted by pressing (swaging) one or more metal sleeves over the rope juncture. One being the Returned Loop and the other the Flemish Eye or farmers splice. MECHANICAL SPLICE slings come in two basic types. This curve, derived from actual test data, relates the efficiency of a rope to different D/d ratios. This curve is based on static loads only and applies to 6X19 and 6X37 class ropes. As the D/d ratio becomes smaller this loss of strength becomes greater and the rope becomes less effi- cient. When a wire rope is bent around any sheave or other cir- cular object, there is a loss of strength due to this bending action. The difference is generally no more than one unit for any slingdiameter. This represents the state- of-the-art technology and tables found in other publications which differ by this small amount should not be construed to be in error.
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Due to computer rounding of numeric values, rated capacity values for 2, 3 or 4 leg slings may not be even multiples of single leg values and may differ by a small amount. Rated capacities contained in all the tables were calculated by computer. Each value was calculated starting with the nominal component rope strength and working up from there. The tables give rated capacities in tons of 2000 pounds. Rated Capacity is the maximum static load a sling is designed to lift.