DMG Mori CTX 750

The DMG Mori CTX 750 is the heavy-hitter at the top of the CTX universal turning lineup, engineered for shops that routinely swing large-diameter workpieces in demanding materials. With a 700 mm (27.6 in) maximum turning diameter, 2,050 mm (80.7 in) turning length, and a 44 kW (59 hp) spindle delivering 2,310 Nm (1,704 ft-lb) of torque, the CTX 750 handles the kind of large forging, casting, and shaft work that sends smaller machines to the hospital.

The A2-11 spindle nose with standard 18-inch (457 mm) chuck grabs workpieces that would overhang anything smaller. Bar capacity is 127 mm (5.0 in), large enough for hydraulic cylinder rod stock and heavy-wall tubing. The spindle tops out at 2,000 RPM, trading speed for the massive torque needed to take heavy cuts in steel, stainless, Inconel, and Duplex without deflection or chatter.

Milling capability comes through the BMT 65 turret spinning driven tools at up to 10,000 RPM with 40 Nm of continuous torque. That is enough to mill flats, drill cross-holes, cut keyways, and tap large-diameter holes without unclamping the part. The Y-axis provides plus/minus 80 mm of travel for off-center features. The C-axis with 0.001-degree indexing handles angular positioning for complex milled geometries.

Box guideways on all axes and a machine weight of 12,500 kg (27,558 lb) provide the mass and damping characteristics that heavy-duty turning demands. The thermal compensation system includes cooled ball screws, spindle temperature management, and bed temperature control. A programmable servo-driven tailstock with MT6 taper supports long workpieces during turning operations.

The CTX 750 runs CELOS with Siemens 840D sl underneath. Pricing runs 20,000-50,000 depending on configuration. Used units from 2014-2020 trade between 60,000 and 80,000. Competitors include the Mazak QT-500, Okuma LB45 II, and purpose-built large-frame lathes from European builders.