Grob G350
Key Specifications
X Travel
Y Travel
Z Travel
Max Spindle
Spindle Taper
Tool Capacity
Overview
The Grob G350 is a 5-axis universal machining center built around Grob’s horizontal spindle and tilting/rotating workpiece table concept. Unlike conventional vertical-spindle tilting-table designs, the G350 keeps the spindle horizontal and stationary in orientation while the workpiece tilts (B-axis) and rotates (A-axis). Chip fall is always gravity-assisted away from the workpiece, full spindle power is available in the optimal cutting direction, and part weight on the table does not degrade dynamic accuracy on the linear axes, which move only the spindle carrier.
The G350 serves mid-size parts up to 500 mm diameter with a 300 kg table load, covering complex prismatic components, medical implants, aerospace brackets, and automotive engine parts needing five-sided access in a single setup. The horizontal spindle and gravity chip evacuation are particularly advantageous in deep-pocket milling where vertical spindles struggle with chip recutting.
Spindle options include 13,000 RPM with high torque for steel and titanium, 17,500 RPM for general machining, or 24,000 RPM for aluminum and high-speed contouring, all with HSK-A63 taper and through-spindle coolant. Controls include Siemens Sinumerik One, Fanuc 31i, and Heidenhain TNC.
Automation is a core G350 strength. Grob builds complete machining lines for BMW, Mercedes-Benz, and Volkswagen, and the G350 inherits that proven automation interface maturity. Pallet changers, robot loading, and multi-machine production cell integration are all field-tested in high-volume automotive production.
Full Specifications
| Parameter | Value |
|---|---|
| X-Axis Travel | 500 mm (19.7 in) |
| Y-Axis Travel | 450 mm (17.7 in) |
| Z-Axis Travel | 450 mm (17.7 in) |
| Max Spindle Speed | 17,500 RPM (24,000 RPM optional) |
| Spindle Taper | HSK-A63 |
| Spindle Motor Power | 35 kW (46.9 hp) |
| Spindle Torque | 120 Nm |
| Table Diameter | 500 mm (19.7 in) |
| Table Load Capacity | 300 kg (661 lb) |
| Rapid Traverse Rate | 60 m/min (2,362 ipm) |
| Tool Capacity | 36 (expandable to 120+) |
| Positioning Accuracy | < 0.005 mm (< 5 µm) |
| CNC Control | Siemens Sinumerik One / Fanuc 31i / Heidenhain TNC |
| Machine Weight | 11,500 kg (25,353 lb) |
Specifications sourced from grobgroup.com — verified 2026-03-28
Strengths & Limitations
Strengths
- Horizontal spindle ensures chip fall is always away from the workpiece, eliminating chip recutting in deep pockets and reducing coolant consumption
- Linear axes carry only the spindle weight so part weight never degrades dynamic accuracy, enabling full-feedrate precision on heavy workpieces up to 300 kg
- Full 35 kW spindle power available in the optimal cutting direction regardless of workpiece orientation
- Mature automation integration from Grob automotive production line business: pallet changers, robot tending, and production cells are proven, not afterthoughts
Limitations
- Horizontal spindle concept requires reorientation for programmers and operators used to vertical-spindle 5-axis machines — expect a 2-4 week learning curve
- 500 mm diameter work envelope limits the machine to mid-size parts; components over 500 mm need the G550 or G750
- Grob commands a significant price premium over generalist 5-axis machines and is rarely the lowest bid in competitive quotes
Best For
Frequently Asked Questions
01
Most 5-axis machines tilt either the spindle head or the workpiece table. Grob keeps the spindle horizontal and stationary. The workpiece tilts (B-axis) and rotates (A-axis) while X, Y, Z move only the spindle carrier. You get consistent gravity-assisted chip fall, full spindle power in the cutting direction, and linear axis dynamics unaffected by workpiece weight.
02
The DMU 50 is a vertical tilting-table trunnion design at $200K-$320K. The G350 at $350K-$550K has a 35 kW horizontal spindle versus 21 kW standard on DMU 50, better chip management for deep-pocket work, and more mature automation. For production automotive work, the G350 is typically preferred. For general-purpose 5-axis with broader service, the DMU 50 has the advantage.
03
The G350 supports pallet changers (2-pallet standard, multi-pallet systems available), robot tending via FANUC or KUKA robot interfaces, and full production line integration. Grob provides turnkey cell integration as a core part of their machine business.
04
Aluminum alloys (24,000 RPM option preferred), steel including hardened grades, cast iron, titanium alloys (Ti-6Al-4V), and superalloys including Inconel at moderate removal rates. The 35 kW spindle provides torque for aggressive titanium roughing.
05
Siemens Sinumerik One (most common), Fanuc 31i (preferred for high-volume automotive cells), and Heidenhain TNC. Grob recommends Siemens for complex simultaneous 5-axis contouring and Fanuc for production cells standardized on that ecosystem.
Videos
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Community Discussions
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Owner experience and review — Grob 150 / 350 : r/Machinists - Reddit
Troubleshooting and problem-solving — Turbine blade being machined by a 5-axis CNC (Grob G350)Shop thinks we don’t need cnc machines for a job shopIf your shop had the money, what 5-axis mill and what lathe ...GROB G550 doin that thing : r/Machinists - Reddit304 Stainless, what the hell am I doing w
Community discussion — Shop thinks we don’t need cnc machines for a job shop
Troubleshooting and problem-solving — GROB G550 doin that thing : r/Machinists - Reddit304 Stainless, what the hell am I doing wrong? - RedditGross positioning error : r/Machinists - Reddit
Links to community discussions. Summaries are editorial — visit the original thread for full context.
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