Machine Comparison
GROB G520 vs Grob G550
Grob vs Grob · 5-Axis Machining Centers
Summary
The GROB G520 and Grob G550 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 G520 leads in max spindle speed (16,000 RPM standard (up to 21,000 RPM optional) vs 6,000 to 30,000 RPM (configuration dependent)). The GROB G520 leads in spindle power (39 kW (52 hp) vs 25-35 kW (34-47 hp) depending on configuration). These machines are closely matched across most specifications, making the decision more about specific feature priorities, dealer support, and your existing shop ecosystem than raw spec advantages. 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 G520 | Grob G550 |
|---|---|---|
| X-Axis Travel | 800 mm (31.5 in) | 800 mm (31.5 in) |
| Y-Axis Travel | 1,020 mm (40.2 in) | 1,020 mm (40.2 in) |
| Z-Axis Travel | 975 mm (38.4 in) | 1,020 mm (40.2 in) ▲ |
| Max Spindle Speed | 16,000 RPM standard (up to 21,000 RPM optional) ▲ | 6,000 to 30,000 RPM (configuration dependent) |
| Spindle Power | 39 kW (52 hp) ▲ | 25-35 kW (34-47 hp) depending on configuration |
| Tool Capacity | 60 tools standard (up to 365 optional) | 60 tools standard (extended magazines available) |
| Control | Siemens SINUMERIK 840D sl | Siemens SINUMERIK 840D sl |
| Spindle Taper | HSK-A63 | HSK-A63 or HSK-A100 |
| A Axis Range | 230° swivel | 230° swivel |
| B Axis Range | 360° continuous | 360° continuous |
| Table Diameter | 750 mm (29.5 in) ▲ | 630 mm (24.8 in) |
| Max Workpiece Weight | 700 kg (1,543 lb) | 800 kg (1,764 lb) ▲ |
| Machine Weight | 19,500 kg (42,990 lb) ▲ | 17,000 - 20,000 kg (37,479 - 44,092 lb) depending on configuration |
| Price Range | $550,000 - $750,000 | $500,000 - $700,000 ▲ |
Advantages
GROB G520
- Higher maximum spindle speed of 16,000 RPM standard (up to 21,000 RPM optional) enables faster cutting on aluminum and non-ferrous materials
- More spindle power at 39 kW (52 hp) for aggressive material removal in harder materials
- Superior table diameter at 750 mm (29.5 in) vs 630 mm (24.8 in)
- Superior machine weight at 19,500 kg (42,990 lb) vs 17,000 - 20,000 kg (37,479 - 44,092 lb) depending on configuration
Grob G550
- Greater z travel of 1,020 mm (40.2 in) accommodates larger workpieces
- Superior max workpiece weight at 800 kg (1,764 lb) vs 700 kg (1,543 lb)
- More competitive pricing at $500,000 - $700,000 compared to $550,000 - $750,000
Verdict
This is a close matchup. The GROB G520 and Grob G550 trade advantages across different specifications, making neither a clear winner on paper alone. Your decision should come down to practical factors: which dealer is closer, which control system your operators already know, what tooling ecosystem you're invested in, and which machine's specific strengths match your highest-volume work. Get quotes on both, run test cuts with your actual parts if possible, and factor in long-term service and support costs.