Machine Comparison
Grob G350 vs GROB G520
Grob vs Grob · 5-Axis Machining Centers
Summary
The Grob G350 and the GROB G520 are both 5-axis machining centers from the same maker, but the GROB G520 is laid out to machine two identical parts per cycle. Its load rating reads 2x625/2x525 kg (without/with pallet), against 400/340 kg for the Grob G350.
The GROB G520 is larger and faster on every row that differs: 750 x 1,000 x 870 mm of travel against 600 x 855 x 750 mm, rapids of 95/70/120 m/min (X/Y/Z) against 70/45/90 m/min, and 2.1 s chip-to-chip against 2.7 s. It is listed with HSK-A63 / HSK-A100 where the Grob G350 has HSK-A63. Both quote 0.006 mm positioning accuracy. The Grob G350 is the lighter machine at 15,300/17,500 kg against 22,500/28,500 kg, without/with pallet changer.
Specifications Comparison
| Specification | Grob G350 | GROB G520 |
|---|---|---|
| X-Axis Travel | 600 mm | 750 mm ▲ |
| Y-Axis Travel | 855 mm | 1,000 mm ▲ |
| Z-Axis Travel | 750 mm | 870 mm ▲ |
| Max Table / Workpiece Load | 400/340 kg (without/with pallet) | 2x625/2x525 kg (without/with pallet, A-/B-axis) ▲ |
| Spindle Taper / Nose | HSK-A63 | HSK-A63 / HSK-A100 |
| Chip-to-Chip Time | 2.7 s (t1, according to VDI 2852) | 2.1 s (t1, according to VDI 2852) ▲ |
| Rapid Traverse | 70/45/90 m/min (X/Y/Z) | 95/70/120 m/min (X/Y/Z) ▲ |
| Positioning Accuracy | 0.006 mm (X/Y/Z) | 0.006 mm (X/Y/Z) |
| Machine Weight | 15,300/17,500 kg (without/with pallet changer) | 22,500/28,500 kg (without/with pallet changer) |
Advantages
Grob G350
- Lighter machine: 15,300/17,500 kg (without/with pallet changer) against 22,500/28,500 kg
- One-part-at-a-time layout, rated 400/340 kg (without/with pallet), for work not made in pairs
- Suits mixed aluminum, small-tool and steel work across its spindle versions
GROB G520
- Two identical parts per cycle, rated 2x625/2x525 kg (without/with pallet)
- 2.1 s chip-to-chip against 2.7 s
- Rapids of 95/70/120 m/min (X/Y/Z) against 70/45/90 m/min
- 750 x 1,000 x 870 mm of travel against 600 x 855 x 750 mm
Verdict
Choose by batch size. The GROB G520 is the pick for series production, where machining two identical parts per cycle, 2.1 s chip-to-chip and 95/70/120 m/min rapids all cut the time per part. The Grob G350 is the pick for shops with varied 5-axis work in smaller lots that fits within 600 x 855 x 750 mm and 400 kg, and that have no use for a second part in the work area. Positioning accuracy is 0.006 mm on both.