GROB G520
Key Specifications
X Travel
Y Travel
Z Travel
Spindle Taper
Rapid Traverse
Accuracy
How much does the GROB G520 cost?
Estimated price range
Our best estimate for a 5-axis machining center in this class — not a quote from Grob. Configuration moves it a long way.
Overview
The GROB G520 is a G-module machining center with 750 mm of X, 1,000 mm of Y and 870 mm of Z travel, and its axes are quick: rapid traverse is 95 m/min in X, 70 m/min in Y and 120 m/min in Z. The G550, with slightly longer travels, is listed at 65/50/80 m/min.
Two rows in GROB's table carry a 2x prefix. Interference diameter is 2x798 mm, and table load is 2x625 kg without a pallet or 2x525 kg with one, on the A-/B-axis. That describes two workpieces in the work area at once, each with its own swing and its own load limit. The table does not state the number of spindles or their spacing, so get the spindle arrangement and the fixture pitch from GROB before designing workholding.
The cycle-time figures point the same way. Chip-to-chip time is 2.1 s (t1, according to VDI 2852), and positioning accuracy is 0.006 mm in X, Y and Z. Eight spindle versions are listed. On HSK-A63 they run from 47 Nm at 12,000 rpm or 18,000 rpm to 83 Nm at 12,000 rpm and 86 Nm at 17,000 rpm. On HSK-A100 they reach 340 Nm at 10,000 rpm, with 340 Nm and 344 Nm versions at 6,000 rpm.
The pallet changer is a large part of the installation. The machine weighs 22,500 kg without it and 28,500 kg with it, so foundation and rigging depend on which build is ordered. Swivel ranges, tool magazine sizes and the control are not in the table.
Full Specifications
| Parameter | Value |
|---|---|
| X-Axis Travel | 750 mm |
| Y-Axis Travel | 1,000 mm |
| Z-Axis Travel | 870 mm |
| Rapid Traverse Rate | 95/70/120 m/min (X/Y/Z) |
| Interference Diameter | 2x798 mm |
| Chip to Chip Time | 2.1 s (t1, according to VDI 2852) |
| Positioning Accuracy | 0.006 mm (X/Y/Z) |
| Machine Weight | 22,500/28,500 kg (without/with pallet changer) |
| Max Table Load | 2x625/2x525 kg (without/with pallet, A-/B-axis) |
| Spindle Taper | HSK-A63 / HSK-A100 |
| Spindle Versions | HSK-A63, 47 Nm, 12,000 rpm; HSK-A63, 47 Nm, 18,000 rpm; HSK-A63, 83 Nm, 12,000 rpm; HSK-A63, 86 Nm, 17,000 rpm; HSK-A100, 185,5 Nm, 12,000 rpm; HSK-A100, 340 Nm, 6,000 rpm; HSK-A100, 344 Nm, 6,000 rpm; HSK-A100, 340 Nm, 10,000 rpm |
Specifications sourced from grobgroup.com — verified 2026-10-03
Strengths & Limitations
Strengths
- Rapid traverse of 95/70/120 m/min in X/Y/Z, against 65/50/80 m/min on the G550
- 2.1 s chip-to-chip time (t1, according to VDI 2852)
- Interference diameter of 2x798 mm and table load of 2x625 kg without a pallet, for two parts in the work area
- Eight spindle versions on HSK-A63 and HSK-A100, from 47 Nm at 18,000 rpm to 344 Nm at 6,000 rpm
- Positioning accuracy of 0.006 mm in X, Y and Z
Limitations
- Table load per position falls from 625 kg to 525 kg when pallets are used
- The pallet changer raises machine weight from 22,500 kg to 28,500 kg
- The table does not list swivel ranges, tool magazine capacity, tool length or the control
- Each part must fit a 798 mm interference diameter, so large single workpieces belong on another model
Best For
Frequently Asked Questions
01
GROB gives the interference diameter as 2x798 mm and the table load as 2x625 kg without a pallet and 2x525 kg with one, on the A-/B-axis. Read plainly, that is two workpiece positions, each with a 798 mm swing and its own load. The table does not state the spindle count, so confirm the arrangement with GROB.
02
Rapid traverse is 95 m/min in X, 70 m/min in Y and 120 m/min in Z over travels of 750 mm, 1,000 mm and 870 mm. Chip-to-chip time is 2.1 s (t1, according to VDI 2852).
03
On HSK-A63: 47 Nm at 12,000 rpm, 47 Nm at 18,000 rpm, 83 Nm at 12,000 rpm and 86 Nm at 17,000 rpm. On HSK-A100: 185,5 Nm at 12,000 rpm (as written in the table), 340 Nm at 6,000 rpm, 344 Nm at 6,000 rpm and 340 Nm at 10,000 rpm. No power figures are given.
04
The G550 has 800 mm of X, 1,020 mm of Y and 970 mm of Z travel with rapid traverse of 65/50/80 m/min, and a single table rated 800 kg without a pallet. The G520 has 750 mm, 1,000 mm and 870 mm with 95/70/120 m/min, and its load is given as 2x625 kg without a pallet.
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