Machine Comparison
GROB G520 vs Grob G550
Grob vs Grob · 5-Axis Machining Centers
Summary
The GROB G520 and the Grob G550 are 5-axis machining centers of similar size from the same maker, built for different work. The GROB G520 machines two identical parts per cycle and is rated 2x625/2x525 kg (without/with pallet); the Grob G550 takes one heavier workpiece, 800 kg without a pallet or 700 kg with one.
The GROB G520 is the faster machine: rapids of 95/70/120 m/min (X/Y/Z) against 65/50/80 m/min, and 2.1 s chip-to-chip against 2.8 s. The Grob G550 has more travel in X and Z, 800 mm and 970 mm against 750 mm and 870 mm, while Y is nearly the same at 1,020 mm and 1,000 mm. Both are listed with HSK-A63 / HSK-A100 and 0.006 mm positioning accuracy.
Specifications Comparison
| Specification | GROB G520 | Grob G550 |
|---|---|---|
| X-Axis Travel | 750 mm | 800 mm ▲ |
| Y-Axis Travel | 1,000 mm | 1,020 mm |
| Z-Axis Travel | 870 mm | 970 mm ▲ |
| Max Table / Workpiece Load | 2x625/2x525 kg (without/with pallet, A-/B-axis) | 700/800 kg (with/without pallet) ▲ |
| Spindle Taper / Nose | HSK-A63 / HSK-A100 | HSK-A63 / HSK-A100 |
| Chip-to-Chip Time | 2.1 s (t1, according to VDI 2852) ▲ | 2.8 s (t1, according to VDI 2852) |
| Rapid Traverse | 95/70/120 m/min (X/Y/Z) ▲ | 65/50/80 m/min (X/Y/Z) |
| Positioning Accuracy | 0.006 mm (X/Y/Z) | 0.006 mm (X/Y/Z) |
| Machine Weight | 22,500/28,500 kg (without/with pallet changer) | 24,800/27,500 kg (without/with pallet changer) |
Advantages
GROB G520
- Two identical parts per cycle, rated 2x625/2x525 kg (without/with pallet)
- Rapids of 95/70/120 m/min (X/Y/Z) against 65/50/80 m/min
- 2.1 s chip-to-chip against 2.8 s
Grob G550
- Single workpiece up to 800 kg without a pallet, or 700 kg with one
- 970 mm of Z travel against 870 mm
- 800 mm of X travel against 750 mm
Verdict
Choose by how the parts are made. The GROB G520 suits series production of parts that can be machined two at a time, where 2.1 s chip-to-chip and 95/70/120 m/min rapids shorten every cycle. The Grob G550 suits single larger or heavier parts, up to 800 kg without a pallet, including steel and titanium work and deep cavities that use its 970 mm of Z. Spindle interface and 0.006 mm positioning accuracy are shared.