Hove-based C Dugard Ltd (www.dugard.com) first introduced its range of heavy-duty ‘reverse axis table’ VMCs in 2011. The success of these machines prompted the company to expand the range to include the new LB series of double-column machining centres.

Designed by Dugard’s engineering team, the LB models feature a substantial machine structure and a powerful geared head for heavy-duty high-efficiency cutting. Providing extra functionality is the option of a manual or semi-automatic 90deg horizontal milling head for five-face machining (this is available for all models).

To accommodate high-speed cutting, there is a direct-drive BT50 10,000rev/min spindle. For heavy-duty cutting, box-way guides can be specified for the Z axis; roller-type linear ways can be specified for more-dynamic performance.

All machines in the LB range feature reduced spindle overhang for increased rigidity and reduced vibration, resulting in improved surface finish, cutting performance and accuracy.

Moreover, the X axis features four linear ways; the two inboard ways are roller types for optimised geometry control, while the two outer ones are ball types configured to fully support the table and minimise deflection.

Furthermore, the hollow ballscrews for the X, Y and Z axes are maintained at a constant temperature by refrigerated coolant, thereby eliminating inaccuracy caused by thermal displacement. The X axis also drives through a gearbox to give the high torque required for heavy-duty cutting; it also incorporates a high-resolution encoder for optimised accuracy.

LB machines offer an X-axis range of 2,200-4,200mm and Y-axis travels of 1,200, 1,600 and 2,700mm; the Z-axis travel is 900mm as standard, with 1,100mm as an option. The choice of control comprises Fanuc 0iMD, Heidenhain iTNC 530 or Siemens 828D.