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to Technical Information Main Page |
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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: |
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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, and for Python Ultra
and HS-9 the maximum permissible deflection angle is 1.5° only.
Groove depth (h):
• Minimum ≥ 0.374
x d for helically grooved drums.
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| CONSTRUCTION |
Suggested
Min. D/d ratio |
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| 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 |
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| 19x7
/ 18x7 |
34 |
| 19x19 |
20 |
| Python®
Compac 18 |
20 |
| Python®
Lift |
20 |
| Python®
Hoist |
20 |
| Python®
Compac 35 |
20 |
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