# GROB G550

Hardware · `G550` · verification: source checked

The G550 is a 5-axis universal machining center with three linear axes (X/Y/Z) and two rotary axes (A/B) and a horizontally arranged spindle. It performs 5-sided machining and 5-axis simultaneous interpolation on a range of materials, using motorized spindles, disk-type tool magazines and tilting rotary tables.

## Specification

| Property | Value |
|---|---|
| Category | cnc mill |
| Axes | 5 |
| Travel X | 800 mm |
| Travel Y | 1020 mm |
| Travel Z | 970 mm |
| Spindle taper | HSK-A63 |
| Rapid traverse | 80 m/min |

### Joints

| Name |
|---|
| A-axis |
| B-axis |

## Connected

- Manufacturer: [GROB](https://machineschema.com/manufacturer/grob.md)

## Safety

- GROB Chip-in-Spindle Detection System (SiS) detects tool clamping faults caused by chips between the plain surface and the spindle nose from 10 μm, to avoid rejects and damage.
- The pallet changer includes an integrated seating check system and flushing of the zero point clamping system for process reliability during pallet change.
- GROB Spindle Diagnostics (GSD) automatically monitors the condition of the motorized spindle to support scheduled maintenance.

## Study notes

- Positioning accuracy is 0.006 mm in the X-/Y-/Z-axis.
- Chip-to-chip time t1 is 2.8 s according to VDI 2852, relative to spindle speed (rpm).
- Interference diameter is 900 mm; table diameter is 770 mm.
- Table load is stated as 700/800 kg with/without pallet; total weight is 24,800/27,500 kg without/with pallet changer.
- A-axis swivel range is 230 degrees, B-axis swivel range is 360 degrees.
- Motorized spindle options: HSK-A63 with 83 Nm/12,000 rpm, 206 Nm/16,000 rpm, 47 Nm/18,000 rpm, 47 Nm/21,000 rpm, 63 Nm/30,000 rpm; HSK-A100 with 265 Nm/13,000 rpm, 575 Nm/9,000 rpm, 340 Nm/10,000 rpm, 340 Nm/6,000 rpm, 344 Nm/6,000 rpm.
- Knuckle example part: aluminium raw material 450 x 200 mm machined with a 16,000 rpm motorized spindle at 32 kW/206 Nm.
- GROB4Pilot machine control panel is available for the SIEMENS 840D sl and HEIDENHAIN TNC 640 control systems.
- Tool length for the single disk-type tool magazine is 465 mm (HSK-A63); for the double disk-type magazine 465/280/700 mm (bottom/top/over both disks, HSK-A63).
- Tilting rotary tables are offered with parallel T-slots (standard) or a pallet clamping system (option), including A-axis-only and B-axis-only versions.
- Options include interpolation turning PLUS, gear hobbing, an energy efficiency package (with SIEMENS control system) and the PSS-L linear pallet storage system connecting up to five machines.

## Sources

1. [Universal machining center G550](https://www.grobgroup.com/en/products/product-range/universal-machining-centers/milling-centers/g550/) (accessed 2026-10-26)

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