C Dugard of Hove has added a CNC horizontal boring machine to its Dugard Eagle range

C Dugard of Hove has added a CNC horizontal boring machine to its Dugard Eagle range

The machine is designed for those who require a high-specification, rigid and powerful solution for large components weighing up to five tonnes and up to 5.5m by 2.6m by 1.3m that require precision boring, milling, drilling and certain turning cycles.

The HBM-4 weighs some 22 tonnes, has a 30kW motor mounted within a heavy-duty column that is carried over its 1,600 Z-axis stroke on hardened and ground boxways having the advantage of two additional supporting ways giving maximum stability and aiding positioning accuracy.

A multi-pitch worm driven rotary table of 1,200mm by 1,500mm with one micron indexing as standard and a hydraulic clamping torque of 4.5 tonnes applied to the heavy-duty bed ensures precision indexing and rigidity.

This enables heavy cutting and tool overhang conditions such as when line-type boring operations are performed typical of the use for a machine of this type.

The spindle and sleeve assembly is supported on double rollers with ISO 50 taper to the 110mm diameter quill and the W-axis outfeed stroke is 550mm.

Driven through a high torque gearbox with oil chiller, hardened and ground gears and automatic two-speed change, the spindle revolutions available are between 35 and 3,000revs/min.

The spindle is served by a 60 tool magazine using a travelling arm tool exchange with easy access for tool loading from the rear.

The maximum tool diameter, automatically handled by the system, is 250mm by 300mm long and weighing up to 25kg.

Travel in X-axis is 2,200 mm with 1,600 mm in Y and Z axes covered at rapid traverse rates of 12m/min.

Combined axis feed rates are fully programmable between one and 5,000mm/min while the B-axis rotary table has a top speed of 8revs/min to provide a turning or profiling capability.

An auger type chip conveyor is standard with options of an angle or universal milling head, a facing head with telescopic toolholder, spindle extension sleeves and an 1,800 increment rotary table.

Control is via Fanuc 18i/20i or Heidenhain's iTNC 530.