Single-Table, Small-Footprint Five-Axis HMC

Jan. 12, 2021
Developed for machining large-diameter parts, a nodding head spindle and direct-drive B-axis rotary table allow the DHF 8000ST to handle roughing through finishing in a single set-up.

DOOSAN MACHINE TOOLS introduced the DHF 8000ST, a single-table version of the DHF 8000 five-axis horizontal machining center. This model incorporates a turning function and was designed without a pallet changer to offer a smaller footprint.

Customers from two industry segments were influential in the development of the DHF 8000ST. The first were the heavy-equipment manufacturers (earthmovers, etc.) who machine large diameter gearboxes that require turning functionality. The second group were companies that also machine large diameter components, such as those supplying oilfield exploration operations and its equipment suppliers.

The nodding head spindle and direct-drive B-axis rotary table allow the DHF 8000ST to handle a complete range of machining and turning processes -- from roughing to finishing -- in a single set-up. This ability to approach workpieces from all sides increases finished parts’ accuracy. In addition, the configuration makes quick work of multi-face workpieces and simultaneous, five-axis machining of complex shapes.

Like the DHF 8000, the nodding head spindle has a stroke of +60 to -100-deg. (up/down) with clamping torque of over 3,600 ft-lb. The DHF 8000ST comes with a 47-hp HSK100-T spindle taper with a 6,000 r/min gear head spindle, and optional 15,000 r/min high-speed spindles are also available.

This scaled-up HMC can easily support workpieces weighing up to two tons, allowing them to be machined with the same precision as their much smaller counterparts. A 1,000-mm (39.4-in.) diameter pallet offers a larger work envelope from the previous model, and its large working area can readily hold parts up to ø 1,600 mm (62.9 in.) diameter x 1,400 mm (55.1 in.) in height.

The DHF 8000ST is constructed with cross-roller linear guideways for extra rigidity. The Y and Z axes are fitted with dual ball screws to ensure greater structural stability and accuracy, while the column is designed with high static and dynamic rigidity to provide optimum machining performance. Linear scales on each axis maintain superior positioning accuracy.

A thermal compensation system -- consisting of sensors strategically placed within critical areas of the machine -- is monitored, to respond accordingly if thermal growth is detected. Cooling systems for the spindle and ball screws also assist with thermal stability. A 120-tool magazine comes standard, and it is expandable to 376 tools.

The DHF 8000ST is supplied with a Siemens 840D control. Learn more at at

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