DMG Mori DMU 55 h twin

The DMG MORI DMU 55 h twin is a twin-spindle horizontal machining center with 580 mm (22.8 in) of X, 750 mm (29.5 in) of Y and 500 mm (19.7 in) of Z travel. It exists to cut two parts in one cycle, which DMG MORI sums up as double output from a compact footprint. The listed workpiece limits are 630 mm (24.8 in) in diameter, 570 mm (22.4 in) in height and 400 kg (881.8 lb).

Two spindles cutting side by side only give two good parts if both tools sit at the same effective length and diameter, and on many twin-spindle layouts that means buying and presetting matched tool pairs. Here the X, Y and Z axes are independent, and DMG MORI states that this allows tool dimensions to be compensated. The spindles are also permanently synchronised to each other, a function the maker calls Syncmot. How large a tool-to-tool difference the compensation covers is not stated, so ask for that figure before planning tooling around it.

Tool capacity is high for an envelope of this size: the wheel magazine is scalable up to 214 tools per spindle. Tool change is given as up to 2.9 s chip-to-chip, and acceleration as 7 / 10 / 8 m/s². Those figures count on the short-cycle parts a twin-spindle machine is bought for, where time out of the cut is a large share of every cycle.

DMG MORI lists a positioning accuracy of 5 µm, cooling of all heat-generating components and a basic structure in GGG60, which it credits with good damping. The Highlights also name turning and grinding integrated alongside milling, a table construction kit and several automation routes, but attach no figures to any of them. Table type, turning capability and workpiece handling therefore have to be pinned down in the quotation, along with the spindle itself, for which no speed, power or torque is given.