Machine Comparison
Grob G550 vs GROB G750
Grob vs Grob · 5-Axis Machining Centers
Summary
The Grob G550 and GROB G750 are both from Grob's 5-axis machining centers lineup, making this a common upgrade or lineup decision for shops already invested in the Grob ecosystem. The GROB G750 leads in x travel (1,000 mm (39.4 in) vs 800 mm (31.5 in)). The GROB G750 leads in spindle power (Up to 55 kW (74 hp) vs 25-35 kW (34-47 hp) depending on configuration). The GROB G750 shows specification advantages in 8 categories, though the Grob G550 may still be the better choice depending on your shop's specific needs and the type of work you run. Both machines are proven performers in production environments and represent solid investments for shops in the market for a 5-axis machining center.
Specifications Comparison
| Specification | Grob G550 | GROB G750 |
|---|---|---|
| X-Axis Travel | 800 mm (31.5 in) | 1,000 mm (39.4 in) ▲ |
| Y-Axis Travel | 1,020 mm (40.2 in) | 1,300 mm (51.2 in) ▲ |
| Z-Axis Travel | 1,020 mm (40.2 in) | 1,500 mm (59.1 in) ▲ |
| Max Spindle Speed | 6,000 to 30,000 RPM (configuration dependent) | 6,000 to 24,000 RPM (configuration dependent) |
| Spindle Power | 25-35 kW (34-47 hp) depending on configuration | Up to 55 kW (74 hp) ▲ |
| Spindle Torque | 47-575 Nm (35-424 ft-lb) depending on configuration | Up to 695 Nm (513 ft-lb) with HSK-A100 ▲ |
| Tool Capacity | 60 tools standard (extended magazines available) | 60 - 215 tools (configuration dependent) |
| Control | Siemens SINUMERIK 840D sl | Siemens SINUMERIK 840D sl |
| Spindle Taper | HSK-A63 or HSK-A100 | HSK-A63 or HSK-A100 |
| A Axis Range | 230° swivel | 230° swivel |
| B Axis Range | 360° continuous | 360° continuous |
| Table Diameter | 630 mm (24.8 in) | 900 mm (35.4 in) ▲ |
| Max Workpiece Weight | 800 kg (1,764 lb) | 1,500 kg (3,307 lb) ▲ |
| Machine Weight | 17,000 - 20,000 kg (37,479 - 44,092 lb) depending on configuration | 25,000 - 28,000 kg (55,116 - 61,729 lb) ▲ |
| Price Range | $500,000 - $700,000 ▲ | $700,000 - $1,000,000 |
Advantages
Grob G550
- More competitive pricing at $500,000 - $700,000 compared to $700,000 - $1,000,000
- Backed by Grob's dealer and service network for parts and support
- Aerospace manufacturers machining large aluminum wing ribs, bulkheads, and structural components that require over 800 mm of Y-axis travel for full-part machining in one setup
GROB G750
- Greater x travel of 1,000 mm (39.4 in) accommodates larger workpieces
- Greater y travel of 1,300 mm (51.2 in) accommodates larger workpieces
- Greater z travel of 1,500 mm (59.1 in) accommodates larger workpieces
- More spindle power at Up to 55 kW (74 hp) for aggressive material removal in harder materials
- Superior spindle torque at Up to 695 Nm (513 ft-lb) with HSK-A100 vs 47-575 Nm (35-424 ft-lb) depending on configuration
Verdict
The GROB G750 edges ahead on specifications in this comparison, particularly in X Travel and Y Travel. However, the Grob G550 remains competitive and may be the better choice depending on price, dealer support in your area, or specific workholding and tooling considerations. Both are capable machines — the best decision comes from running your actual parts and evaluating total cost of ownership including tooling, training, and service.