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Gantry crane

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SMART proposed that a great ball contraption gantry crane would consist of a grab claw on a static gantry that can travel and descend to pick up entire crates of balls at once, moving them to a high ledge (or between one or more ground stations). It might, if high enough, allow a stream of modules to run under it.[1]


Cable-car: grasping crate claw drops from a wire-riding cable-car. A cable-car could cover large distances quickly, although maximum lift weight is likely low, and tension in the cable (metal wire) needs to be high (firm anchors, non-LEGO pieces probably would be needed).[1]




MOC builder explanation given image available video available instructions available follows GBC standard


  1. 1.0 1.1 "The Great Ball Contraption." <http://www.teamhassenplug.org/GBC/contraptionideas.htm>.
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