Niigata Machine Techno USA, Inc. SPN702

Niigata SPN702 Box-in-Box Horizontal Machining Center Niigata originated the "Box in Box"® machine design to provide high-speed, optimum cutting performance and long-term stability. The design provides rigidity. With only a few microns of deflection of the base column under dynamic load, this maintains squareness and allows a 3-point installation. The base rigidity is further increased by eliminating the "U" shaped cut-out normally found in some "center-through" designs. The spindle is carried on a ductile iron daddle (1.5 times stiffer than cast iron), which is mounted on the wide-spaced perpendicularly oriented X axis ways. Reduced mass provides higher ACC/DEC rates and contributes to lower maintenance with longer life cycle. Axial thrust is always captured between the upper and lower X ways, and n o column "lean" occurs when working in high "Y" positions (compared to traditional moving column designs). The center of the gravity of the mass of the spindle and the spindle saddle is positioned directly above the bottom X way, which is mounted in the Z-X plane. The stationary "one-piece" column is mounted on a rigid T-shaped "mono-cast" base. This is the heart of machine squareness, which is critical in achieving accurate machining. Mount the spindle carrying saddle to the column and the goal of practical long-term high speed movement is realized.