Grob G 900

$1,800,000 - $2,800,000 Updated 2026-03-17

Key Specifications

X / Y / Z Travel

900 mm / 1,250 mm / 900 mm

Rotary Table Diameter

900 mm

Max Workpiece Diameter

1,250 mm

Max Workpiece Height

900 mm

Max Table Load

2,500 kg

Spindle Orientation

Horizontal

Overview

The Grob G 900 is Grob extra-large 5-axis universal machining center, engineered for aerospace structural programs where workpiece size and weight push beyond the capacity of conventional 5-axis trunnion-table machines. With X/Y/Z travels of 900 mm x 1,250 mm x 900 mm and a table load capacity of 2,500 kg, the G 900 represents the upper limit of Grob G-series rotating-table architecture before transitioning to gantry-style large-format solutions.

The G 900 maintains Grob signature horizontal spindle orientation, ensuring chips and coolant fall away from the cutting zone throughout long, complex programs typical of aerospace structural machining in titanium, aluminum, and nickel superalloys. The B-axis swiveling trunnion table provides plus or minus 115 degrees of tilt, and the A-axis rotary table delivers continuous 360-degree rotation, enabling full simultaneous 5-axis interpolation across the full 900 mm x 1,250 mm table footprint.

At this scale, spindle power is paramount. The G 900 is equipped with a 60 kW HSK-A63 spindle capable of 17,500 rpm, delivering the metal removal rates needed for rough-machining large titanium aircraft structural components in a single setup. The 80-position tool magazine expandable to 200 tools supports the extensive tool arrays required by complex aerospace multi-operation programs, with an integrated tool measurement system ensuring accurate length compensation after each change.

The G 900 is designed for integration into automated aerospace manufacturing lines. It supports Grob large-format PSS-R pallet storage systems and robot cell configurations rated for pallet weights matching the machine 2,500 kg workpiece capacity. The Siemens Sinumerik ONE or Heidenhain TNC 640 control options integrate seamlessly with aerospace PLM and MES systems, supporting full part traceability from raw forging to finished component.

Full Specifications

Parameter	Value
X / Y / Z Travel	900 mm / 1,250 mm / 900 mm
Rotary Table Diameter	900 mm
Max Workpiece Diameter	1,250 mm
Max Workpiece Height	900 mm
Max Table Load	2,500 kg
Spindle Orientation	Horizontal
Spindle Speed (Max)	17,500 rpm
Spindle Motor Power	60 kW (S1)
Spindle Taper	HSK-A63
B-Axis Swivel Range	+/-115 degrees
A-Axis	360 degrees (continuous)
Feed Rate (Max)	50 m/min
Tool Magazine Capacity	80 tools (200 optional)
Positioning Accuracy	+/-0.005 mm
CNC Control	Heidenhain TNC 640 or Siemens Sinumerik ONE

Specifications sourced from grobgroup.com — verified 2026-03-28

Strengths & Limitations

Strengths

900x1,250x900 mm envelope with 2,500 kg capacity for the largest aerospace structural components
60 kW horizontal spindle delivers maximum material removal rates for large titanium roughing programs
Full simultaneous 5-axis capability at extra-large scale with +/-115 degree B-axis and continuous A-axis
200-tool magazine option supports complex multi-operation aerospace structural programs
Horizontal spindle ensures gravity chip evacuation during extended titanium and Inconel cutting sessions

Limitations

Investment exceeds $1.8 million -- reserved for established aerospace OEM or tier-1 supplier operations
Machine weight and size require significant facility infrastructure: foundation, crane, and environmental controls
Fixturing and programming complexity at this scale demands specialized aerospace manufacturing expertise

Best For

Aerospace structural frames, bulkheads, and wing spars in titanium requiring 5-axis machining in one setup Large engine mounts, nacelle structures, and landing gear forgings at aerospace OEM scale Defense structures and missile body components requiring precision 5-axis machining on heavy forgings Tier-1 aerospace suppliers running automated 5-axis production lines for structural component families

Frequently Asked Questions

01 How does the Grob G 900 compare to the G 800?

The G 900 has a larger work envelope (900x1,250x900 mm vs. 800x1,000x800 mm on the G 800), a higher table load (2,500 kg vs. 1,600 kg), and greater spindle power (60 kW vs. 52 kW). The G 900 targets the most demanding aerospace structural programs at the top of Grob G-series rotating-table lineup.

02 Is a turning version of the G 900 available?

Grob offers mill-turn T variants across the G-series lineup. Contact Grob directly to confirm availability of a G 900 T configuration, as mill-turn capability at this table size and load capacity requires custom torque motor sizing and speed matching for the intended turning applications.

03 What materials is the Grob G 900 designed to cut?

The G 900 is primarily designed for aerospace-grade titanium (Ti-6Al-4V, Ti-5Al-5V-5Mo-3Cr), aluminum structural alloys (7xxx and 2xxx series), nickel superalloys (Inconel 718, Waspaloy), and high-strength steels. Its 60 kW spindle and rigid horizontal architecture are sized for aggressive roughing in these materials.

04 What automation systems are compatible with the G 900?

The G 900 is compatible with Grob large-format PSS-R pallet storage and retrieval systems and heavy-duty robot loading cells engineered for pallet weights matching the 2,500 kg workpiece capacity. Grob configures automation cells on a project basis for OEM aerospace installations.

05 What is the typical lead time for a Grob G 900?

As an extra-large specialty machine, the G 900 typically requires 14-20 months from order to delivery. Site preparation, foundation engineering, and installation add a further 2-3 months. Early project engagement with Grob application engineering is essential for new facility installations.