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A compound pulley system reduces the physical effort needed to move heavy loads by using a fixed and moving pulley. It multiplies the pull force, reducing strain on the winch and towed object. It can be found on cranes and winch machines and allows for smaller, lighter machines with greater lifting capacity. It also reduces strain on winch motors and allows for more pulling power from a single battery. Although it may take longer, the benefits outweigh the problems and repairs.
A compound pulley system uses a fixed pulley and a moving pulley so that an operator is able to move a heavy load with less physical effort. The multiple sheave system is capable of multiplying the pull and pull force of the winch, reducing the strain on the winch and the towed object. Such a system can be found on many heavy lifting cranes and winch machines. The block and fixture is also a type of compound system.
In the simplest terms, the weight reduction of a given load is reduced by the number of sheaves used in a compound sheave system. With this in mind, a system that uses four pulleys to lift an object will appear as though the user is actually lifting a quarter of the object’s weight. This is why a crane is able to operate with a smaller cable and winch, saving valuable machine space and allowing the crane to be physically smaller and lighter, while still being operational and able to lift greater amounts of weight.
The compound system also affects the ability to shoot. When using a winch to recover a vehicle that is stuck in deep mud or trapped in a steep ditch, for example, the winch operator often uses a system of compound pulleys to assist in pulling the vehicle out while exerting a minimal stress on winch and cable. Using this type of system, a much smaller winch can often do the job of a much larger device while staying cool and drawing much less energy.
On battery powered winch motors, this means more pulling power from a single battery. It also means less chance of damaging the winch motor due to overheating of the electrical circuits from motor strain and strain. With a hydraulic winch motor, there is much less chance of breaking a fluid line or damaging the pump due to hard pulling. Traction will take a little longer when using a compound system, although most users agree that the benefits outweigh the problems and repairs. The system can help with heavy tasks and allow work to be completed with very less effort on any system.
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