Grob G750

$700,000 - $1,200,000 Updated 2026-03-16

Key Specifications

X Travel

800 mm (31.5 in)

Y Travel

700 mm (27.6 in)

Z Travel

700 mm (27.6 in)

Max Spindle

13,000 RPM (18,000 RPM optional)

Spindle Taper

HSK-A63 / HSK-A100

Tool Capacity

80 (expandable to 300+)

Overview

The Grob G750 is the flagship of the G-series universal 5-axis machining center line, offering an 800 mm diameter work table with 1,500 kg load capacity and spindle power up to 82 kW. It targets the intersection of large automotive structural production and aerospace manufacturing: complex parts requiring simultaneous 5-axis contouring at production volumes. Automotive transmission cases, aerospace frame sections, large hydraulic manifolds, and energy turbine components are the defining applications.

The G750 retains the horizontal spindle and tilting/rotating workpiece table kinematic concept, which at this scale provides an even more significant advantage over vertical-spindle alternatives. An 1,500 kg workpiece on a tilting trunnion table would severely load the tilt axis torque motors, degrading accuracy. On the G750, the workpiece weight is carried by the B-axis tilting mechanism specifically designed for these loads, while the linear axis dynamics remain unaffected by part weight.

Spindle options range from 13,000 RPM for heavy steel and titanium work to 18,000 RPM for general production machining. The 82 kW maximum spindle power is at the upper end of any 5-axis machining center and enables aggressive roughing of titanium aerospace billets that would require multiple setups on less powerful machines. HSK-A100 taper is available for maximum rigidity in heavy-cut applications.

Grob offers the G750 with full automation integration including multi-pallet systems, overhead gantry loading, and floor-level robot tending. The machine scale and automation capability make it competitive with dedicated transfer lines for high-volume prismatic parts where 5-axis access is also required.

Full Specifications

Parameter	Value
X-Axis Travel	800 mm (31.5 in)
Y-Axis Travel	700 mm (27.6 in)
Z-Axis Travel	700 mm (27.6 in)
Max Spindle Speed	13,000 RPM (18,000 RPM optional)
Spindle Taper	HSK-A63 / HSK-A100
Spindle Motor Power	82 kW (110 hp)
Spindle Torque	460 Nm
Table Diameter	800 mm (31.5 in)
Table Load Capacity	1,500 kg (3,307 lb)
Rapid Traverse Rate	50 m/min (1,969 ipm)
Tool Capacity	80 (expandable to 300+)
Positioning Accuracy	< 0.006 mm (< 6 µm)
CNC Control	Siemens Sinumerik One / Fanuc 31i
Machine Weight	30,000 kg (66,139 lb)

Strengths & Limitations

Strengths

82 kW / 460 Nm spindle enables production titanium roughing at material removal rates competitive with dedicated horizontal machining centers
1,500 kg table load capacity covers virtually all aerospace structural components and large automotive powertrain housings
Horizontal spindle kinematics remain advantageous at this scale: 1,500 kg workpieces on a tilting trunnion would degrade accuracy, but the G750 linear axes are unaffected by part weight
Multi-pallet and gantry automation options enable true production line operation for complex prismatic parts requiring 5-axis access

Limitations

Price range of $700K-$1.2M requires thorough ROI justification and high spindle utilization to recover the capital investment
At 30,000 kg, the G750 requires significant foundation work and structural assessment of the plant floor before installation
Standard 13,000 RPM spindle speed limits aluminum high-speed finishing capability compared to smaller higher-speed machines

Best For

Aerospace prime and tier-1 manufacturers machining large titanium and aluminum structural components in production volumes Automotive powertrain manufacturers running high-volume 5-axis production on large engine blocks, gearboxes, and transfer cases Energy sector manufacturers machining large turbine casings, compressor housings, and pump bodies requiring simultaneous 5-axis contouring Defense contractors machining large complex aluminum and titanium structures where single-setup capability reduces setup error and lead time

Frequently Asked Questions

01 Who is the Grob G750 designed for?

The G750 is for manufacturers who need simultaneous 5-axis capability on large, heavy parts at production volumes. Typical customers are aerospace tier-1 suppliers machining large titanium structural frames, automotive manufacturers machining large powertrain housings in high volume, and energy OEMs machining large turbine casings. The G750 is a dedicated production machine, not a general-purpose job shop tool.

02 How does the G750 compare to a large horizontal machining center?

A large HMC like the Mazak HCN-8800 or Okuma MA-8000H offers higher pallet change speed and typically lower cost for pure prismatic 3-axis work. The G750 adds full simultaneous 5-axis capability, allowing complex 5-axis features to be machined in the same setup as prismatic features. For parts requiring both, the G750 eliminates secondary setups and accumulated fixturing error.

03 What spindle taper options are available on the G750?

The G750 is available with HSK-A63 for high-speed work and HSK-A100 for maximum rigidity in heavy-cut titanium and steel applications. HSK-A100 provides significantly higher clamping force and tool holder rigidity than HSK-A63, translating to better surface finish and longer tool life in aggressive roughing operations.

04 What foundation requirements does the G750 have?

At 30,000 kg, the G750 requires a reinforced concrete foundation typically 1,200-1,500 mm deep depending on soil conditions. Grob provides foundation design drawings and requires a site survey before machine acceptance. Shops should budget $50,000-$150,000 for foundation work depending on existing plant conditions.

05 How long does a G750 project take from order to production-ready?

A typical G750 project runs 12-18 months from order to first production part. This includes machine build time (8-12 months), shipping and installation (1-2 months), commissioning and calibration (4-6 weeks), and operator training (2-4 weeks). Full production readiness with automation integration may extend the timeline.