The VDF 800 DUS Big Bore CNC lathe is engineered for energy-industry work with 14" (365-mm) spindle diameter, 32" (820-mm) swing over the bed, 17,600 lb (8,000 kg) part capacity, and 4,500 lb (20 kN) Z-axis cutting force. Especially useful for drill string parts, drive shafts and pipes, the machine has a main drive rated at 50 hp (37 kW) continuous, 74 hp (55 kW) maximum, with 5,300 foot-pounds (7,200 Nm) maximum torque. A 900-rpm top speed gives the job shop flexibility to handle a range of smaller diameter parts by maintaining the tool surface speeds needed to produce required finishes. The two-speed automatic transmission is mounted behind the headstock to eliminate thermal effects caused by the gearing, with a backlash-free overload coupling to protect the gearbox. The machine’s A20 spindle is supported with a thermally optimized arrangement of lifetime-lubricated bearings that includes an 18" (460-mm) diameter front bearing to withstand increased loads and speeds.
The lathe is equipped with a Siemens or Heidenhain CNC, which is supplemented with an operator panel and handwheels for setup or teach-type programming. The CNC can be programmed to have a cutting routine using the handwheels, with the CNC replicating that routine on subsequent parts.
The machine is built on a torsionally stiff, box-type Meehanite cast iron bed, 22" (560 mm) wide, that retains its core sand to increase vibration damping for longest tool life and smooth part finishes, the company says. Hardened, double-V guideways and a cross slide provide stability for the tool carrier and distribute axial cutting forces to prevent skewing.
Chip chutes in the bed provide flow of swarf to the chip pan at the rear, preventing heating of the bed, while sliding doors on the rear of the machine allow easy access for chip disposal. The machine’s power supply, electric cables, power tracks and coolant pump are all located outside the work zone to simplify maintenance and protect them from coolant and chips.
The machine is available with turning length sizes of 3.3, 6.6, 9.8, 13.1 ft. (1, 2, 3 and 4 m) as standard, and as much as 65.6 ft. (20 m) optional.