In the high-precision manufacturing sector, 5-axis machining is no longer a luxury—it is a necessity for producing complex aerospace, automotive, medical, and tooling components. Among the leading manufacturers of these systems, the German engineering giant GROB-WERKE is highly regarded for its robust construction, innovative spindle concepts, and exceptional accuracy.
For companies looking to scale their production capacity without the prohibitive capital expenditure of a brand-new machine, acquiring a used GROB G350 Universal Machining Center represents an outstanding investment. Sourcing pre-owned industrial equipment allows businesses to deploy high-end capabilities rapidly. This guide explores the technical specifications, unique structural advantages, geographic availability, and procurement strategies for a used GROB G350.
1. Why Choose a GROB G350? The Structural Advantages
The GROB G350 stands out from conventional 5-axis machining centers due to its unique machine layout. While many 5-axis machines rely on a tilting rotary table mounted on a standard C-frame, GROB utilizes a horizontal spindle configuration coupled with a specialized axis concept.
Unique Axis Concept
- Z-Axis Carriage: The Z-axis movement is carried out by the spindle head, minimizing the moving mass of the workpiece.
- A-Axis & B-Axis: The table provides the rotary movements. The A-axis has a tilting range of up to 225 degrees, allowing for inverted machining (machining overhead), which is exceptionally beneficial for chip evacuation.
- X-Axis and Y-Axis: These linear axes are also separated from the workpiece movement, maintaining consistent dynamics regardless of the part weight.
The Horizontal Spindle Advantage
Unlike vertical machining centers, the GROB G350 features a horizontal spindle. This design offers two major benefits:
- Unmatched Chip Fall: During heavy milling operations, chips fall away from the workpiece naturally due to gravity. This eliminates chip recutting, extending tool life and improving surface finish.
- Compact Footprint: The G350 offers one of the largest working envelopes relative to its floor space requirement, making it ideal for facilities where floor space is at a premium.
2. Technical Specifications of the GROB G350
When evaluating a used GROB G350, verifying the technical specifications against your production requirements is critical. The machine is designed for both high-speed machining of aluminum and heavy-duty cutting of tough steels.
| Parameter | Specification |
|---|---|
| X-Axis Travel | 600 mm |
| Y-Axis Travel | 770 mm (optionally up to 855 mm) |
| Z-Axis Travel | 805 mm (optionally up to 750 mm depending on model year) |
| Max. Workpiece Diameter | Ø 850 mm |
| Max. Workpiece Height | 500 mm |
| Max. Load Capacity (Table) | 400 kg (optional 600 kg) |
| Spindle Speed Options | 12,000 / 16,000 / 18,000 rpm (HSK-A63) |
| Tool Changer Capacity | 40 / 60 / 117 pockets |
| Control System | Siemens SINUMERIK 840D sl or Heidenhain iTNC 530 / TNC 640 |
3. Siemens vs. Heidenhain Controls on Used Models
Used GROB G350 machines in the European market are typically equipped with either Siemens or Heidenhain control units. Choosing the right one depends heavily on your existing shop floor ecosystem:
- Siemens SINUMERIK 840D sl: Highly preferred for automated environments, multi-channel operations, and shops that run complex macro-programs or utilize advanced cycle times.
- Heidenhain TNC 640 / iTNC 530: The industry favorite for shop-floor programming. If your operators are already trained on Heidenhain, maintaining this consistency avoids steep learning curves.
4. Geo-Targeting & Procurement: Sourcing a GROB G350 from Germany and Europe
As a German-manufactured machine, the highest density of used GROB G350 centers is found within industrial hubs in Germany (Baden-Württemberg, Bavaria, North Rhine-Westphalia) and neighboring European nations (Italy, Switzerland, Austria). Sourcing a used machine from Germany offers distinct advantages:
Regular Maintenance and Service History
German manufacturing plants typically operate under strict maintenance schedules, often backed by direct service contracts with GROB. When buying a used G350 through Asset-Trade, we prioritize machines with documented service logs, ensuring the spindle, guide-ways, and rotary joints have been maintained to OEM standards.
On-Site Inspections and Power-on Tests
Before purchasing, we highly recommend an on-site inspection. For machines located in Germany, Austria, or the Netherlands, Asset-Trade coordinates:
- Visual Inspection: Checking for geometric wear, axis backlash, and spindle noise.
- Under Power Test: Observing the machine running a test program to verify axis interpolation and tool-changer speed.
- Ballbar Testing: Assessing circularity and geometric alignment of the 5-axis configuration.
5. Logistics, Dismantling, and Re-commissioning
Purchasing the machine is only the first step. Dismantling, transporting, and re-assembling a high-precision 5-axis machine requires specialized engineering expertise.
- Professional Dismantling: Axis locks must be installed, and fluid lines drained according to GROB specifications.
- Specialized Transport: Due to its weight and precision components, the machine must be transported on air-suspended trailers.
- Re-commissioning & Calibration: Once on your site, the machine must be leveled and calibrated using laser interferometers to ensure the 5-axis kinematic parameters match original factory specifications.
Asset-Trade offers a full-service "Worry-Free" package, handling the complete dismantling and shipping logistics from the seller's factory floor directly to your facility, whether you are located within the EU or importing globally.
6. Conclusion: A Used GROB G350 is a Smart Capital Decision
Investing in a used GROB G350 Universal Machining Center allows your company to access top-tier German engineering and 5-axis precision at a fraction of the cost of new equipment. By partnering with an industrial specialist like Asset-Trade, you mitigate the risks associated with buying used machinery through structured inspections, complete technical documentation, and professional logistics support.
Explore our current inventory of used Grob G350 machining centers and elevate your manufacturing capabilities with a machine renowned for its precision and reliability. Contact the Asset-Trade team today to check availability, request pricing, or schedule a viewing of a GROB G350 under power.
