Frequently Asked Questions
What is a fleet angle?
The fleet angle is the angle between the first fixed sheave and the flange of the winch.
What fleet angle is required for the LEBUS groove?
As a rule, the spooling angle should be between ¼° and 1 ¼°. At the same time, however, the design and speed of the cable must be taken into account. In borderline cases, please contact our specialists.
What spooling angle is required for the HELICAL groove?
In the case of single-layer wound cable drums, the spooling angle of 3° should not be exceeded.
What minimum preload is necessary for the LEBUS groove?
The preload is the load on the cable at the cable drum. As a rule, it should be at least 2% of the breaking load or 10% of the working load. At the same time, however, provision must also be made for the safety coefficient and the design of the cable. For more detailed information, please contact our specialists.
Can I install LEBUS split sleeves on any type of cable drum?
Subject to compliance with the technical requirements of a LEBUS system, any wire rope winch system can be retrofitted with a LEBUS groove.
What happens if the cable goes slack?
If the minimum preload is not met, isolated cable loops may be wound on loosely. This can lead to the cable being nicked and damaged during subsequent spooling.
What material can a LEBUS groove be made of?
Steel grade ASTM A-36is used as standard. However, special steels such as ASTM A572-50 and ASTM A516-70 are also increasingly being used. If required, we can also supply systems made of aluminium or fiberglass.
What is the D:d ratio?
The D:d ratio describes the relationship between the drum diameter at the center of the 1st cable layer (PCD = Pitch Circle Diameter) = D and the cable diameter = d.