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Why are giant machines that are designed with pulleys for these functions instead of hydraulics?
Wiki User
∙ 15y ago
Not sure if I know what "giant machines" are, but I can make a comparison with Airplanes. Some large aircraft use pulleys and cables to work the flight controls and the newer ones use hydraulics or electrical servos. The cables have an advantage in that they are less complicated than hydraulic controls. Hydraulics have to have a reservoir, a pump, and usually high pressure lines as well as a return line. This requires a lot of maintenance and present more problems if the hydraulic lines required for large vehicles. The larger the vehicle, the more hydraulic oil to fill the lines. Modern military jets and the A380 use smaller hydraulic lines pressurized at 5000psi, which reduces the required volume of oil. Of course, a system pressurized at 5000psi seems to present more problems than a 3000 psi. Now, the cons of the pulley and cable is that this does not apply as much force as a hydraulic system. Also, for long cable runs and complicated controls, the cables require a lot of rigging and adjustment and checking the cable for damages from wear. Did that help??
Wiki User
∙ 15y ago
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