The slewing drive is a gearbox that can safely hold radial and axial loads, as well as transmit a torque for rotating. The rotation can be in a single axis, or in multiple axes together. Slewing drives are made by manufacturing gearing, bearings, seals , housing, motor and other auxiliary components and assembling them into a finished gearbox. Slewing drives function with standard worm technology, in which the worm on the horizontal shaft acts as the driver for the gear. http://www.ldb-slewdrive.com/open-housing-slewing-drive/