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Mori Seiki’s NH8000 DCG brings the potential advantages of driven at the center of gravity (DCG) technology to machining large parts. After consulting more than 450 engineering professionals from around the world, the company chose to address typical problems with part quality and machine performance when developing the new technology.
The machine contains twin ballscrew drives on the XYZ axes, which is said to reduce vibration without compromising the speed required for maintaining accuracy. Force Loop Advanced Shape (FLASH) technology has also been incorporated. The platform has been designed to increase rigidity on all axes, allowing machining forces to traverse across the box-in-box structure and through the bed to form a closed loop.
To further eliminate vibration during operation, the tool magazine is isolated from the body of the machine. A 60-tool rack-type magazine is standard, with optional 140-, 240- and 330-tool capacities available. The rack magazine transports the tool to the ATC location, virtually eliminating the need for a tilting arm, the company says.
Other features include a tool-to-tool changing time of 2.1 seconds; the ability to accommodate a maximum tool length of 31.5"; a work envelope with a diameter of 57.1" × 57.1", which is equipped to handle as much as 4,409 lbs; a 50-taper spindle that can achieve a maximum speed of 10,000 rpm in 3.20 seconds. During machining, the maximum rapid traverse rate of 1,969 ipm can be accomplished with acceleration of 0.43 G, 0.76 G and 0.41 G on the XYZ axes respectively.
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