The DHF 8000ST: Full Range Machining and Turning in One Setup
As you probably know from following our blog posts, it’s the voice of our customers that often initiates a new design or update to one of the machines in our product line. That was definitely the case with our new DHF 8000ST, a single table version of the popular DHF 8000 50 taper, A-axis nodding head spindle, 5-axis machine.
Our Panel of Experts
Customers from two industry segments were influential in the development of the DHF 8000ST. The first was heavy equipment manufacturers (earthmovers, etc.) who machine large diameter gearboxes that require turning operations. The second group was companies, such as those found in the aerospace and the oil field industries, that also machine large diameter components. With their input, and using the DHF 8000 as a base, we began design work on the DHF 8000ST.
We started by incorporating a turning function and engineering the machine without a pallet changer for customers who wanted a smaller footprint and larger work envelope. That was just the beginning.
One Setup Does It All
The A-axis 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 setup. This ability to attack parts from all sides also provides increased parts accuracy. In addition, the configuration makes quick work of multi-face workpieces and the 5-axis simultaneous machining of complex shapes.
Like the DHF 8000, the A-axis head spindle has a stroke of +60 to -100 degrees (up/down) with clamping torque of over 3,600 ft-lb. The DHF 8000ST comes with a 47 horsepowerHSK100-T spindle taper with a 6,000 r/min gear head spindle, and optional 8,000 or 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 1,000mm (39.4”) diameter pallet offers a bigger work envelope from the previous model, and its large working area can readily hold parts up to ø 1,600mm (62.9”) diameter x 1,400mm (55.1”) in height.
The DHF 8000ST is constructed with cross roller linear guideways for extra rigidity. The Y- and Z-axis are fitted with dual ballscrews 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, monitors and compensates if thermal growth is detected. Cooling systems for the spindle and ballscrews also assist with thermal stability. A 120-tool magazine comes standard, which is expandable to 376 tools. The DHF 8000ST comes equipped with a Siemens 840D control.
The outstanding flexibility of the DHF 8000ST comes at a very competitive price. The turning function even makes it possible to replace standalone turning centers in the shop, saving on capital expenditures as well as floor space. And if you're looking to dive a little deeper into the details and learn more, contact us today.