Machine Comparison
Grob G550 vs Grob G750
Grob vs Grob · 5-Axis Machining Centers
Summary
The Grob G550 and the Grob G750 are 5-axis machining centers from the same maker, one size apart. Both are listed with HSK-A63 / HSK-A100 spindle interfaces and 0.006 mm positioning accuracy; the Grob G750 is the larger machine and the Grob G550 the slightly quicker one.
The Grob G750 offers 1,000 x 1,100 x 1,175 mm of travel against 800 x 1,020 x 970 mm, and carries 1,000/1,500 kg (with/without pallet) against 700/800 kg. The Grob G550 answers with 2.8 s chip-to-chip against 3.3 s and rapids of 65/50/80 m/min (X/Y/Z) against 60/50/75 m/min. It is also the lighter machine, 24,800/27,500 kg against 34,500/40,500 kg, without/with pallet changer.
Specifications Comparison
| Specification | Grob G550 | Grob G750 |
|---|---|---|
| X-Axis Travel | 800 mm | 1,000 mm ▲ |
| Y-Axis Travel | 1,020 mm | 1,100 mm ▲ |
| Z-Axis Travel | 970 mm | 1,175 mm ▲ |
| Max Table / Workpiece Load | 700/800 kg (with/without pallet) | 1,000/1,500 kg (with/without pallet) ▲ |
| Spindle Taper / Nose | HSK-A63 / HSK-A100 | HSK-A63 / HSK-A100 |
| Chip-to-Chip Time | 2.8 s (t1, according to VDI 2852) ▲ | 3.3 s (t1, according to VDI 2852) |
| Rapid Traverse | 65/50/80 m/min (X/Y/Z) ▲ | 60/50/75 m/min (X/Y/Z) |
| Positioning Accuracy | 0.006 mm (X/Y/Z) | 0.006 mm (X/Y/Z) |
| Machine Weight | 24,800/27,500 kg (without/with pallet changer) | 34,500/40,500 kg (without/with pallet changer) |
Advantages
Grob G550
- 2.8 s chip-to-chip against 3.3 s
- Rapids of 65/50/80 m/min (X/Y/Z) against 60/50/75 m/min
- Lighter machine: 24,800/27,500 kg (without/with pallet changer) against 34,500/40,500 kg
Grob G750
- 1,000 x 1,100 x 1,175 mm of travel against 800 x 1,020 x 970 mm
- 1,000/1,500 kg load (with/without pallet) against 700/800 kg
- 1,175 mm of Z travel against 970 mm for deep features
Verdict
Choose by workpiece size and weight. If the parts fit within 800 x 1,020 x 970 mm and 800 kg, the Grob G550 does the same work with a quicker 2.8 s chip-to-chip time and a lighter machine. If the parts are large housings or structural components that need 1,000 mm of X, 1,175 mm of Z or up to 1,500 kg without a pallet, the Grob G750 is the one that holds them. Accuracy and spindle interfaces do not separate the two.