NILES ZE 400 CNC GEAR PROFILE FORM GRINDING MACHINE. Model ZE 400, New 2004. NOTE: The Niles ZE 400 Represents Outstanding Performance for Gear Manufacturers. Equipped with OnBoard Measuring and an Integated CNCDressing Devise, the Niles ZE 400 is Capable of Utilizing Both Dressable Vitrified and NonDressable CBN Wheel to FormGrind a Variety of Work Pieces Precisely .