Australia’s largest machine tool

Starrag supplies a Droop+Rein five-axis gantry machine with 11 metre rotary table to the other side of the world

A Starrag Group-supplied Droop+Rein gantry milling machine with X, Y and Z axes traverses of 14,000 mm x 13,000 mm x 3,500 mm, plus an 11 metre rotary table to permit turning operations in the same set-up, will be the largest machine ever to be put into operation in Australia.

Being supplied to the Naval Group in Osborne, South Australia, the five-axis giant will be used to machine hull elements and other high-precision components for the Royal Australian Navy’s Attack class submarines.

from left – Marcus Queins, Head of the Large Parts Machining Systems business unit at Starrag; John Davis, CEO of Naval Group Australia; and Thomas Hegmann, Managing Director of H&H Machine Tools Australia


The order for the machine comes after the Australian Government (Commonwealth of Australia) selected French company Naval Group to deliver a fleet of 12 regionally superior submarines, to be built in a modern construction yard in Osborne, South Australia.

The Future Submarine Program will deliver Australia a capability that can be built, operated and maintained with sovereignty, which maximises opportunities for Australian industry throughout all phases of the programme.

As the design of the Attack class progresses, the Naval Group continues to deliver on its commitment to achieve this through its suppliers – a pool that now includes the Starrag Group which has been selected to supply a Droop+Rein G 110TT HR100 C vertical gantry machine, capable of handling both large hull elements and high-precision components for submarine construction.  

Starrag is collaborating with the Australian machine tool manufacturer, H&H Machine Tools Australia, to deliver this important equipment. The company will manufacture key components, supply qualified personnel to help install the gantry and provide technical support for the entire life cycle of the machine, securing an enduring role in servicing and maintenance in the future. Starrag will provide H&H with the necessary expertise through on-site training and quality control, transferring critical skills and sovereign ability to Australian industry.

The contract was awarded following a complex selection process. Noting its many years of experience and its extensive, not merely technical, expertise in handling large, complicated projects, the Starrag Group was an obvious selection for the contract. Not every machine supplier can manage an order of this magnitude from over 15,000 kilometres away — but this is no problem for the Starrag Group, as Australian sales partner H&H will facilitate local work, ensuring that everything runs smoothly on-site. A previous project carried out in South Australia, for which Starrag supplied four machines for aircraft construction, shows a proven track record in this regard.

Gantry machine for precise heavy-duty cutting of large and heavy workpieces

The Australian Government’s ambitious project requires large machines, such as the Droop+Rein gantry 110TT supplied by Starrag


The size and efficiency of the milling machine being supplied, which is also capable of turning components thanks to the integrated rotary table – tried and tested as part of the Dörries range of lathes from the Starrag Group – was of fundamental importance. The Droop+Rein G 110 TT HR100 C owes its high-precision to features such as the hydrostatic guides in all linear axes, as well as the thermosymmetrical design of the milling unit with integrated C axis.

Milling heads can be changed automatically via a head change interface. The team responsible selected five different machining heads to use in this project: the high-performance fork milling head possesses the ability to not only apply tools at any angle but it also has the necessary prerequisites for heavy-duty machining on five axes simultaneously.

Alternatively, the machine can be used with one straight and one angled 100 kW milling head with a torque of 7,500 Nm. A turret and a horizontal facing head are available for turning operations.

The large, multi-functional machine supplied by Starrag from its Bielefeld plant in Germany gives the operator optimum access. The operator can reach any point on the workpiece thanks to the spacious cabin, which travels along the gantry and features the latest Siemens operator panel. The cabin can reach a height of 8 metres and be moved towards the centre of the table.

Another decisive factor in favour of the Starrag Group was that, having already supplied machines to reference customers, the company could prove that the installed machine technology is very robust. This ensures that, with proper maintenance, the machine will be operational for the entire duration of the submarine project — the first of the Attack class submarines will be delivered in the early 2030s and continue into the early 2050s.