GROB G440

$400,000 - $600,000 Updated 2026-03-16

Key Specifications

X Travel

560 mm (22 in)

Y Travel

560 mm (22 in)

Z Travel

630 mm (24.8 in)

Max Spindle

15,000 rpm

Spindle Taper

HSK-A63

Tool Capacity

40 (expandable to 60)

Overview

The GROB G440 is a 4-axis horizontal machining center engineered for high-volume production of prismatic automotive and industrial components. While GROB is best known for its 5-axis universal machining centers, the G440 represents their production machining heritage — a platform designed from the ground up for cycle time optimization, maximum spindle utilization, and integration into automated manufacturing systems. With 560 x 560 x 630 mm (22 x 22 x 24.8 in) X/Y/Z travels and a 400 mm pallet, the G440 targets the high-volume production niche where every second of cycle time matters.

The spindle runs at up to 15,000 rpm through an HSK-A63 interface, delivering 30 kW (40 hp) continuous power. GROB offers both gear-driven and motorized spindle variants — the gear-driven option provides higher torque for cast iron and steel roughing, while the motorized spindle excels in high-speed aluminum machining. The B-axis rotary table provides 1-degree indexing for multi-face tombstone work, and the dual pallet changer keeps the spindle cutting while operators load the next part.

The G440's construction follows GROB's philosophy of thermally symmetric design with active temperature compensation. The cast iron bed and column provide the mass and damping needed for aggressive cutting, while roller linear guides on all axes ensure the dynamic stiffness required for high feed rates. The 40-position tool magazine (expandable to 60) uses a fast tool change mechanism with chip-to-chip times under 4 seconds, minimizing non-cutting time in multi-tool production programs.

Automation integration is a core design principle. The G440's pallet interface supports GROB's own pallet pool systems as well as third-party FMS providers like Fastems. The Siemens Sinumerik 840D sl control handles production management functions including tool life monitoring, sister tool switching, and statistical process control. New G440 machines are priced between $400,000 and $600,000, competing directly with the Mazak HCN-4000, DMG MORI NHX 4000, and Okuma MB-4000HII.

Full Specifications

Parameter	Value
X-Axis Travel	560 mm (22 in)
Y-Axis Travel	560 mm (22 in)
Z-Axis Travel	630 mm (24.8 in)
Pallet Size	400 x 400 mm (15.7 x 15.7 in)
Max Spindle Speed	15,000 rpm
Spindle Taper	HSK-A63
Spindle Motor Power	30 kW (40 hp) continuous
Spindle Torque	192 Nm (142 ft-lb)
B Axis	1° indexing (360 positions)
Number Of Pallets	2 (dual pallet changer)
Max Workpiece Weight	500 kg (1,102 lb) per pallet
Tool Capacity	40 (expandable to 60)
Rapid Traverse Rate	60 m/min (2,362 ipm) all axes
CNC Control	Siemens Sinumerik 840D sl
Machine Weight	12,000 kg (26,455 lb)
Chip To Chip	< 4 seconds

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

Strengths & Limitations

Strengths

Sub-4-second chip-to-chip time and 60 m/min rapids minimize non-cutting time — critical for production environments where cycle time drives profitability
GROB's production system heritage means the G440 is designed for 24/7 reliability with automotive-grade uptime expectations
Dual pallet changer with 400 mm pallets enables setup during cutting, driving spindle utilization above 85% even in high-mix environments
Both gear-driven and motorized spindle options available — shops can optimize for their primary material (cast iron/steel vs aluminum)
Thermally symmetric design with active compensation maintains dimensional stability through long production shifts without warm-up drift
Native integration with GROB pallet pool systems and third-party FMS platforms for unmanned multi-shift production

Limitations

400 mm pallet size limits workpiece envelope compared to 500mm-class competitors — larger parts may need the next size up
GROB's horizontal machining center lineup is less well-known than their 5-axis machines, which means fewer reference installations for benchmarking
Siemens 840D sl control requires Siemens-trained programmers — shops standardized on FANUC or Mazatrol face a learning curve
North American parts and service availability for GROB HMCs lags behind established Japanese competitors with decades of domestic support infrastructure
1-degree B-axis indexing is standard — continuous B-axis for interpolated contouring is not available on this platform

Best For

Automotive production facilities machining cylinder heads, transmission housings, and intake manifolds at production volumes Tier 1 suppliers producing aluminum and cast iron powertrain components requiring consistent cycle times and high uptime Industrial equipment manufacturers machining hydraulic valve bodies, pump housings, and pneumatic manifolds in medium to high volumes Shops building FMS cells where multiple G440 machines share a common pallet pool for mixed-part production flexibility Production environments where GROB's thermal stability and dimensional consistency reduce scrap rates on tight-tolerance prismatic parts

Frequently Asked Questions

01 How does the GROB G440 compare to the Mazak HCN-4000?

Both target the 400mm-class horizontal machining center segment. The Mazak HCN-4000 offers the MAZATROL SmoothG control with conversational programming, a wider range of spindle options, and Mazak's extensive North American service network. The GROB G440 counters with its production-proven thermal stability, sub-4-second tool changes, and seamless integration with GROB automation systems. The Mazak is more versatile for job shop environments; the GROB is optimized for dedicated production applications. Pricing is comparable.

02 What spindle options are available for the G440?

GROB offers both gear-driven and motorized spindle configurations. The gear-driven spindle provides higher constant torque across a wide RPM range, ideal for cast iron and steel machining. The motorized spindle reaches 15,000 rpm with better high-speed performance for aluminum work. Both use the HSK-A63 interface. Most automotive aluminum applications use the motorized spindle; heavy cast iron and steel production typically runs the gear-driven variant.

03 Can the G440 be used in a flexible manufacturing system?

Yes, FMS integration is a core design principle. The G440's standard pallet interface works with GROB's own pallet storage systems and third-party FMS providers like Fastems and Liebherr. The Siemens 840D sl control supports the cell management functions needed for FMS operation, including automatic tool life management, sister tool calling, and job scheduling. Multi-machine G440 cells with 20-40 pallets are common in automotive production.

04 What coolant and chip management does the G440 include?

The G440 comes standard with through-spindle coolant at 70 bar (1,000 psi), a high-volume chip conveyor, and full machine enclosure with mist collection. The horizontal spindle orientation naturally directs chips downward into the conveyor. For high-volume aluminum machining, GROB offers enhanced chip management packages with higher coolant flow rates and larger chip conveyor capacity to handle the chip volumes generated during aggressive roughing cycles.