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Doosan Infracore’s DNM 400A VMC is designed for high productivity with precision tolerances, and built to fit crowded shop floors. The machine’s one-piece casting is ribbed to prevent distortion during heavy or interrupted cuts. The casting is constructed of fine-grain Meehanite for its damping and heat-dissipating characteristics. Widely spaced linear guideways support the saddle in all locations, regardless of the table’s load distribution. Each guideway is induction hardened and precision ground. Rapid traverses are 1,181 ipm along all three axes.
A 15-hp spindle motor powers the machine and drives ISO#40 taper tools at speeds ranging to 8,000 rpm while delivering 52 foot-pounds of torque. The cartridge-type spindle is supported by precision-class, permanently lubricated bearings. A heavy-duty drive belt is said to eliminate slippage, reduce vibration and contribute to thermal stability.
Another feature, a 20-station, double-arm ATC, changes tools in 1.3 sec. The Big Plus dual-contact tooling system creates full contact along the spindle taper and the toolholder flange. This maximizes rigidity for increased precision and tool life, the company says. Both Big Plus and standard tool holders can be mounted at any ATC station with no need for special adaptors.
Overall, the 86.7" × 87.2" footprint is suited for buildings with standard 8 × 8 ft. doors. It can accommodate parts as large as 25.0" × 17.1" × 20.1" and as heavy as 881 lbs.
Additional features include rigid tapping capability; an auger-type chip conveyor; cooling and lubrication systems; a program- and data-protection key switch; and a portable manual pulse generator with movement in increments of ×1, ×10 and ×100. The color controller is a Fanuc Oi-MD.