Abstract: Drive mechanism suitable for a parts treating machine comprises a housing defining a chamber containing a rotatable carriage wheel with a fixture journalled for rotation thereon. A carriage wheel drive is provided for indexing the carriage wheel and a fixture drive for rotating fixtures carried by the carriage wheel at a predetermined position. The carriage wheel drive includes a motor and a gear reducer operatively connected to the carriage wheel. The fixture drive includes a motor and a gear reducer operatively connected to a gear on a shaft extending upwardly from the fixture by an endless belt. The carriage wheel may be moved from a load station to a treating station, where spray nozzles or the like may spray treating material onto the parts to be treated as they are rotated together with the fixture at the treating station.