The DMG Mori NT6600DCG/4000CS is a heavy-duty multi-tasking CNC turning and milling center with a reputation for cast-iron rigidity and tight positioning that has made it the machine of choice for oil and gas shafts, large aerospace housings, power-generation components, and industrial roll production. This 2017 build (serial NT660160902) features twin opposing hydraulic spindles carrying (2) 24.8-inch SMW 3-jaw chucks with 10.31-inch through-holes, 160.4 inches of between-centers capacity in the 4,000mm counter-spindle configuration, a 42.1-inch maximum turning diameter and swing, 160.4 inches of maximum turning length, and a 10.31-inch bar capacity on both spindles running at 1,000 RPM. The B-axis upper milling tool spindle covers ±120 degrees of positioning and is backed by a 140-position automatic tool changer, a 3-position automatic long boring bar changer, live milling to 8,000 RPM, and Renishaw probing, with multiple steady rests already installed. X-travel reaches 40.9 inches and Z-travel extends 163.4 inches. Running on DMG Mori's DCG (Driven at Center of Gravity) cast-iron bed and controlled by Siemens 840D with the CELOS app-based interface, the machine also ships with a chip conveyor and has been professionally prepped for shipment. Reported run time is 5,500 hours.
Compared to DMG Mori's earlier NT-series multi-tasking lathes without DCG technology — including the NT4300 class and pre-DCG NT6600 configurations — the NT6600DCG/4000CS is a meaningful heavy-duty upgrade, not just a size increase. DCG's dual-ballscrew drive arrangement routes axis drive forces through the tool's center of gravity, cutting vibration and extending tool life over the older single-ballscrew NT designs that fought chatter on heavy roughing passes. CELOS running on Siemens 840D replaces the Fanuc-based interfaces used on earlier NT models, delivering app-based job management, integrated tool and fixture databases, and full Ethernet connectivity not standard on the older platforms. The 140-position ATC paired with the 3-position long-boring-bar changer multiplies the effective tool reach over the 40-to-80-tool magazines standard on earlier NT machines, opening long unattended cycles on complex mill-turn work. With the twin SMW chucks, steady rests, Renishaw probing, and chip conveyor already installed and the machine prepped for shipment, the buyer steps into a production-ready heavy-duty mill-turn cell at a used price.