Extending the range

Extending the range
Extending the range

Designed specifically for larger components and extending its existing G series of machines, Grob has introduced the G800 machining centre with a pallet size of 800 by 800mm. The 4-axis machine is also available in 5- and 6-axis configurations.

The G800 machining centre with X, Y, Z travel ranges of 1,600 x 1,200 x 1,300mm is claimed by the manufacturer to be ideal for machining larger workpieces such as engine components and rear axle housings for the commercial, agricultural and construction vehicle segment. Likewise in general machining applications the versatile G800 is suitable for wide range of machining tasks for industries such as mould making, aerospace, and power generation. With its 4-axis modular system – also optionally available with 5 or 6 axes – the machine can be optimally configured to the customer's requirements.

The larger than average operating area of the G800 allows the machining of workpieces up to a swing circle diameter of 1,600mm and a height of 1,500mm. A steep chip incline in the operating area facilitates excellent swarf evacuation capability. Due to a time optimised tool change arm, the chip to chip time achieves tool weights of up to 60kg. Wide guideway distances assure high machine rigidity and because of its size, extra-long tools up to 850mm can be used – even in the standard version.

The machine incorporates a travelling column design with speeds up to 60m/minute. In the 4-axis version, the milling spindle is positioned horizontally but a 5-axis version with an HV head was developed as an option.

The HV head uses a sleeve to house the motor spindle with 575Nm at 40% ED. The sleeve allows a linear feed movement of 300mm within the HV head which allows drilling and tapping operations to be performed more dynamically with less stress on the machine.

Furthermore, the extended sleeve generates a slim interference contour of the spindle nose, thus permitting machining with short tools as well as accessing difficult to reach places on the workpiece. The B-axis rotary table is driven by a torque motor and can be hydraulically clamped using 10,000Nm during machining. The effective swing circle diameter of the rotary table is 1,600mm.

In addition to direct loading of workpieces into the machine's operating area, a variant with an automatic pallet changer was also developed. The steep incline of the swarf drop makes the G800 also suitable for dry machining and minimum quantity lubrication applications. The drives of the linear feed axes feature ballscrew technology and the stability and rigidity of the machining centre relies on FE-optimised base assemblies and amply dimensioned roller rail guides.

Grob's internally developed and manufactured main spindles are used on G range machines, incorporating a number of features such as short run-up times, universal applicability, customer-specific torque curves, good accessibility and easy servicing, highest mechanical characteristics, long service life as well as an inherent suitability for all typical cooling lubricants. A new high performance two stage geared spindle is available for machining with 2,500Nm (40% ED) and an output of 80kW (40% ED) up to 6,000 rpm. Advantages such as high torque with high output permit impressive cutting rates.

An active drill head support for using angular milling/drill heads is optionally available for the G800. Tools with HSK-A100 interface are provided for initial machining. In the base model, the tool magazine has a capacity of 57 tools and can be modularly expanded.

Grob
www.grobgroup.com

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