Machine Comparison
Grob G350 vs GROB G520
Grob vs Grob · 5-Axis Machining Centers
Summary
The Grob G350 and GROB G520 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 x travel (800 mm (31.5 in) vs 600 mm (23.6 in)). 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 G350 | GROB G520 |
|---|---|---|
| X-Axis Travel | 600 mm (23.6 in) | 800 mm (31.5 in) ▲ |
| Y-Axis Travel | 855 mm (33.7 in) | 1,020 mm (40.2 in) ▲ |
| Z-Axis Travel | 750 mm (29.5 in) | 975 mm (38.4 in) ▲ |
| Max Spindle Speed | 16,000 RPM standard (up to 21,000 RPM optional) | 16,000 RPM standard (up to 21,000 RPM optional) |
| Spindle Power | 39 kW (52 hp) | 39 kW (52 hp) |
| Tool Capacity | 60 tools standard (up to 365 optional) | 60 tools standard (up to 365 optional) |
| Accuracy | 0.006 mm (0.00024 in) | 0.006 mm (0.00024 in) |
| Control | Siemens SINUMERIK 840D sl | Siemens SINUMERIK 840D sl |
| Spindle Taper | HSK-A63 | HSK-A63 |
| A Axis Range | 230° swivel | 230° swivel |
| B Axis Range | 360° continuous | 360° continuous |
| Rapid Traverse X | 70 m/min (2,756 ipm) ▲ | 60 m/min (2,362 ipm) |
| Rapid Traverse Y | 45 m/min (1,772 ipm) | 45 m/min (1,772 ipm) |
| Rapid Traverse Z | 90 m/min (3,543 ipm) ▲ | 75 m/min (2,953 ipm) |
| Price Range | $400,000 - $550,000 ▲ | $550,000 - $750,000 |
Advantages
Grob G350
- Superior rapid traverse x at 70 m/min (2,756 ipm) vs 60 m/min (2,362 ipm)
- Superior rapid traverse z at 90 m/min (3,543 ipm) vs 75 m/min (2,953 ipm)
- More competitive pricing at $400,000 - $550,000 compared to $550,000 - $750,000
GROB G520
- Greater x travel of 800 mm (31.5 in) accommodates larger workpieces
- Greater y travel of 1,020 mm (40.2 in) accommodates larger workpieces
- Greater z travel of 975 mm (38.4 in) accommodates larger workpieces
Verdict
This is a close matchup. The Grob G350 and GROB G520 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.