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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 – Rope Properties & Data
  to Technical Information Main Page
Sheave Dimensions

We recommend only sheaves made of steel or cast steel. The following are recommended values:

Groove radius (r):
Minimum 0.53 to 0.535 x d
Maximum 0.55 x d
Recommended: ≈ 1% over the actual wire rope diameter.

Groove depth (h):
Recommended: ≈ 1.5 x d or d x √2

Sheave throat angle:
For normal applications use 35° to 45° opening. Applications with deflection angles of more than 1.5° use 60° opening. Opening angles below 35° must be avoided.

Sheave hardness:
As the hardness of the single wires in a rope can be approximated to be 50-55 RC, the hardness on the sheave surface must be min. 35 RC, better is 40-45 RC.

D/d ratios:
Depending on the actual equipment and usage of wire rope in hoisting- or pulling applications the following D/d ratios are suggested:
  Drum Dimensions

Generally, we recommend grooved drums only. The rope is spooled properly and positively. Depending on the drum/rope diameter relationship helix-grooved drums can be used for up to 3 layers without excessive rope wear. For applications with more than 3 layers (e.g. Mobile cranes) we recommend 'Lebus' grooving.

It has to be remembered, however, that rope service life on multiple layer drum systems will always only be a fraction of that compared with single layer helix-grooved drums.

Important: For standard applications the drum grooving should be left hand to accomodate standard right hand lay ropes!

Groove radius (r):
Minimum 0.53 to 0.535 x d
Maximum 0.55 x d

Pitch diameter (p):
The pitch dia. has to be chosen in accordance with the groove radius. Under no circumstance should the pitch dia. be smaller than:
• Minimum 2.065 x groove radius
• Maximum 2.18 x groove radius

If these values are applied to single layer grooved drums the maximum permissible rope-deflection angle for regular wire rope constructions is 4°. For non rotating /rotation-resistant ropes the maximum permissible deflection angle is 1.5° only.

Groove depth (h):
• Minimum ≥ 0.374 x d for helically grooved drums.


Min. D/d ratio
6x19 S IWRC 34
6x26 WS IWRC 30
6x25 FW IWRC 26
6x36 WS IWRC 23
Python® Multi 20
Python® Super 8 20
Python® Power 9 26
Python® Ultra 26
8x36 18
19x7 / 18x7 34
19x19 20
Python® Compac 18 20
Python® Lift 20
Python® Hoist 20
Python® Compac 35 20
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