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  Return to Wire Rope Main Page and Detailed Wire Rope Data  
    Technical Information  
  Use and Care of Wire Rope  
  Wire Rope is a Machine  
    Installation of Wire Rope:  
  Foreword, Measuring the rope diameter  
  If you have to cut a rope  
  Unreeling the rope  
  Connecting the old rope to the new rope  
  Rope lay direction versus Drum Grooving  
  Winding on to the drum  
  Installation of Wedge Sockets  
  Using your rope for the first time  
  Efficiency ratings of end terminations  
    Inspection of Wire Rope:  
  How to inspect Wire Rope  
  Crown- and Valley Wire Breaks  
  Number of broken Wire Discard Tables  
  Reduction of diameter, Rope Wear  
  Rope Stretch, Core Wire breaks  
  Mechanical damages  
  Corrosion, Rope Removal and Cause  
  Inspection of Sheaves and Drums, Dimensions of Groove Radius  
  Cut and Slip Procedure, Lubrication  
    Rope Properties & Data:  
  Tensile Strength and Fill Factor  
  Strand- and Swage Compaction  
  Rotation Resistant and Non-Rotating Wire Rope  
  Sheave and Drum Dimensions  
  Relative Service Life, Loss of Strength over Pins, Why Multistrand Ropes  
Technical Information
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Wire Rope is a Machine

A wire rope is a machine, by dictionary definition: "An assemblage of parts...that transmit forces, motion, and energy one to another in some predetermined manner and to some desired end."

A typical wire rope may contain hundreds of individual wires which are formed and fabricated to operate at close bearing tolerances one to another. When a wire rope bends, each of its many wires slides and adjusts in the bend to accommodate the difference in length between the inside and the outside bend. The sharper bend, the greater movement.

Every wire rope has three basic components:
(1) The wires which form the strands and collectively provide the rope strength;
(2) The strands, which are helically around the core; and,
(3) The core, which forms a foundation for the strands.

The core of wire rope may be an Independent Wire Rope Core (Steel Core, IWRC, SE, or CW), which in many cases is actually a rope in itself. This core provides between 10% and 50% (in non-rotating constructions) of the wire rope's strength.

The greatest difference in wire ropes are found in the number of strands, the construction of strands, the size of the core, and the lay direction of the strand versus the core.

The wires of wire rope are made of high-carbon steel. These carbon steel wires come in various grades. The term "Grade" is used to designate the strength of the wire rope. Rope wires are usually made of 1770 N/mm, 1960 N/mm, or 2160 N/mm steel grades [Approximate equivalents are Improved Plow Steel (IPS), Extra Improved Plow Steel (EIPS) or Extra Extra Improved Plow Steel (EEIPS)].

One cannot determine the Tensile Grade of a wire rope by its feel or appearance. To properly evaluate a rope's tensile grade you must obtain the Grade from your employer or Unirope Limited @ 1.800.457.9997.
  Flexing the rope makes the strands slide against each other.
Right Regular Lay
Left Regular Lay
Right Lang Lay
Left Lang Lay
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