TACCHELLA UN and UM Universal Grinding Machines. Detailed Catalogue. TACCHELLA UN and UM Universal Grinding Machines Models UN 618, UM618, UM 1018 and UM1518. Detailed Sales and Technical Specification Catalogue. 20 pages. Manufacturers: Tacchella Models: UN 618 UM 618 UM1018 UM1518 Contents: Catalog