Doosan DNM 6700 Plus

The DNM 6700 uses standard ball-type linear guideways and a 12,000 RPM / 22 kW spindle. The DNM 6700 Plus upgrades to roller-type linear guideways — providing higher load capacity, better vibration damping, and improved performance in heavy interrupted cuts — and offers an optional 30 kW BT 50 spindle for power-cutting applications. The Plus is the choice for shops running demanding steel and cast iron programs; the standard DNM 6700 is appropriate for lighter-duty general machining and aluminum work.

Yes. Doosan offers a two-pallet automatic pallet changer (APC) option for the DNM 6700 Plus, enabling lights-out operation between operator interventions. The APC allows one pallet to be loaded and fixtured while the other is in the cutting zone. This is particularly valuable for shops running long-cycle mold programs where unattended overnight operation is possible. Integration with robot loading systems is also supported via the Fanuc 31i-B5 control's robot interface options.

Through-spindle coolant at 70 bar is strongly recommended for mold work on the DNM 6700 Plus. When deep-pocket milling in P20 or H13 at depths-to-diameter ratios above 3:1, through-spindle coolant dramatically improves chip evacuation, prevents chip re-cutting (which damages cutting edges and workpiece surfaces), and maintains tool temperature stability. For shops routinely machining mold cavities with 50–100 mm deep pockets, through-spindle coolant typically pays for itself in extended tool life and improved surface quality within the first several months of operation.

Both machines offer approximately 1,300 mm X-travel and similar spindle options. The Mazak VCN-700 uses Mazak's Smooth Technology control with more sophisticated machining cycle management and has a stronger brand reputation supporting better resale values. The Doosan DNM 6700 Plus offers comparable mechanical specifications with roller guideways and typically costs $30,000–$50,000 less than a similarly configured Mazak. For shops prioritizing lowest acquisition cost with solid mechanical capability, the Doosan is compelling. For shops where long-term support network and resale value are priorities, the Mazak warrants the premium.

Choose BT 40 / 15,000 RPM if your primary work is aluminum high-speed machining, light steel, and general machining where rapid traverse and fast spindle acceleration are priorities. Choose BT 50 / 12,000 RPM / 30 kW if your primary work is heavy steel, cast iron, stainless, or large-diameter face milling where spindle torque and rigidity matter more than maximum RPM. Mold shops doing both roughing (benefits from BT 50 torque) and finishing (benefits from BT 40 speed) often choose BT 40 and compensate with strategic roughing strategies, but the BT 50 option makes sense for shops where heavy roughing is the primary work.