This a custom robot assembled from a modified All Terrain Heavy Duty Enclosed Robot Platform . The chassis is a rigid gusseted aluminum frame that is precisely fabricated using CNC equipment. The wheels are mounted on solid steel axles which are supported by two sealed ball bearings. Each axle/wheel is driven by a planetary gear motor through a chain and sprocket drive, delivering smooth reliable power. The robot uses differential steering (movement is based on two separately driven wheels placed on either side of the robot body. It can thus change its direction by varying the relative rate of rotation of its wheels). See our ATR page for more details about our All Terrain Robots.