The Unit deals with a two-stage gear. The kitcontains all the individual parts to build the gear. The gear comprises a spurgear stage as its input, with a downstream worm gear stage (combined gear). Thefit seatings of the gear unit are designed to allow the complete assemblyprocess to be performed by hand. All parts are laid out clearly and are wellprotected in a sheet-steel tool box. Small parts are contained in a box with atransparent lid. A set of tools is included. The contemporary instructional materialsprovide extensive technical information that provides the basis for lessondesign. The core element of the teaching materials is a complete set ofdrawings with lists of parts, single-part drawings, exploded views and assemblydrawings. All drawings are to standard and are dimensioned in accordance withproduction requirements. Pdf files and assembly videos are also usefulfeatures. The fully assembled gear can be tested for functionality using theoptionally available.