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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  
    Maintenance:  
  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 – Installation of Wire Rope
     
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Foreword
 
In order to fully achieve the service life potential of Python™ and standard wire rope for demanding crane jobs, these step by step instructions should be followed. They are intended to prevent rope damage caused by kinks, untwisting, and loose strands during handling and installation.

We realize that the 'real world' is not perfect. This applies also to wire rope installation. It is impossible to cover ALL imaginable installation situations, location difficulties, and crane set ups. You will also find that these instructions are not very different from the installation procedure of 6-strand or 19x7 ropes. Many experienced Riggers may find some of the following "old hat". If you notice any omissions or have ideas that we can incorporate into this brochure we will be most appreciative.
 
 
Measuring the rope diameter

Before you start anything, make sure the diameter of the new rope you are about to install is the correct one for your crane.
Remember that most wire ropes measure slightly over their nominal diameter.

Standard rope is allowed to measure up to 5% over their nominal diameter. Some PYTHON® wire rope is made with a maximum 4% tolerance only.

The rope you are going to replace may be worn and may measure less than the rope you are about to install.

Keep a record of the new rope diameter for future references. You will be asked to determine how much the rope diameter has decreased in service and you MUST know the ACTUAL diameter of the wire rope after the break in period (click here for more info).

When measuring the rope, don't measure the layer on the reel. Pull a couple of feet off the reel and measure the rope when straight. It is advisable to take 4 measurements of the rope round it's axis and average the results.
 
4% Diameter Tolerances
Nominal
Dia. mm
Maximum
Dia. mm
  Nominal
Dia. inch
Maximum
Dia. inch
10 10.40   3/8 .39
11 11.45   7/16 .45
12 12.50   1/2 .52
14 14.55   9/16 .59
15 15.60   5/8 .65
16 16.65   3/4

.78

18 18.70   7/8 .91
20 20.80   1 1.04
22 22.90   1-1/8 1.17
24 25.00   1-1/4 1.30
26 27.05   1-3/8 1.43
28 29.10   1-1/2 1.56
30 31.20   1-5/8 1.69
32 33.30   1-3/4 1.82
34 35.35   1-7/8 1.95
36 37.45   2 2.08
   
 
5% Diameter Tolerances
Nominal
Dia. mm
Maximum
Dia. mm
  Nominal
Dia. inch
Maximum
Dia. inch
10 10.50   3/8 .40
11 11.50   7/16 .46
12 12.60   1/2 .53
14 14.70   9/16 .59
15 15.70   5/8 .65
16 16.80   3/4

.79

18 18.90   7/8 .92
20 21.00   1 1.05
22 23.10   1-1/8 1.18
24 25.20   1-1/4 1.31
26 27.30   1-3/8 1.44
28 29.40   1-1/2 1.58
30 31.50   1-5/8 1.71
32 33.60   1-3/4 1.84
34 35.70   1-7/8 1.97
36 37.80   2 2.10
   
 
   
 
   
     
     
     
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