Florence-based MazakCorp. has contracted withFort Mitchell-based PaulHemmer Co. for construction of a $6.1 million expansion of Mazak’s Chicagotechnology center. The project is due for completionby spring. Hemmer hasmanaged more than 20 construction projects for Mazak, the machine tool manufacturing firm with eighttechnology centers acrossNorth America. The Chicago expansion will add anauditorium, classroomspace and expanded demonstration areas for machinetool technology.