28-10-2014, 11:23 AM
Abstracts: Cranes are industrial machines that are mainly used for materials movements in construction sites, production halls, assembly lines, storage areas, power stations and similar places. Their design features vary widely according to their major operational specifications such as: type of motion of the crane structure, weight and type of the load, location of the crane, geometric features, operating system and environmental conditions. A crane is a lifting machine, generally equipped with a winder (also called a wire rope drum), wire ropes or chains and sheaves that can be used both to lift and lower materials and to move them horizontally. The rack and pinion mechanism is used in EOT crane instead of using wheel and rail for long travelling of girder. It should not slip in normal condition. In the slope of rail it would not slip and being accurate. Accuracy is high of the rack and pinion as compare to wheel and rail.