1988 MITSUI SEIKI MITSUISEIKI VERTICAL MACHINING CENTERS

Technical Description

The 1988 Mitsui Seiki vertical machining center is a 3-axis VMC from Mitsui Seiki Kogyo's precision machining center product line, most likely a VS5A or VS series model from the company's late-1980s catalog. Mitsui Seiki is a Japanese precision machine tool builder renowned for the accuracy and rigidity of their machining centers, with a particular reputation in aerospace and precision industrial applications where tolerances are measured in microns. The VS5A-class machine features a 59 x 23.6 inch hardened and ground cast-iron work table and provides X-, Y-, and Z-axis travels of approximately 42.5, 25.6, and 24.0 inches, accommodating sizeable and complex prismatic components. The CAT-50 taper spindle operates at speeds up to 4,500 RPM driven by a 20 HP motor, with emphasis on rigidity and torque for heavy-duty cutting in hardened steel, titanium, and other difficult-to-machine materials. The machine is equipped with a Fanuc 11M CNC control, one of Fanuc's established mid-1980s control platforms with full G-code and macro programming capability. At approximately 22,000 to 28,500 pounds, the machine reflects Mitsui Seiki's philosophy of prioritizing structural mass and mechanical precision over cycle speed. As a 1988 vintage machine, buyers should assess spindle condition, guideway wear, and control health prior to acquisition.