# GROB G550a

Hardware · `G550a` · verification: source checked

The GROB G550a is a 5-axis universal machining center with a horizontally arranged motorized spindle. It has three linear axes (X, Y, Z) and two rotary axes (A and B), which allow 5-sided machining and 5-axis simultaneous interpolation. It is built for milling applications in mechanical engineering, automotive and die/mold work, and can be extended with pallet changers and pallet storage systems for automation.

## Specification

| Property | Value |
|---|---|
| Category | cnc mill |
| Axes | 5 |
| Weight | 21500 kg |
| Travel X | 800 mm |
| Travel Y | 950 mm |
| Travel Z | 1020 mm |
| Rapid traverse | 60 m/min |
| Table load | 700 kg |

## Connected

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

## Study notes

- Working travels are 800 mm (X), 950 mm (Y) and 1,020 mm (Z); maximum axis speeds are 60 m/min (X), 42 m/min (Y) and 60 m/min (Z).
- Interference diameter is 900 mm.
- Positioning accuracy in the X/Y/Z axes is 0.006 mm.
- Chip-to-chip time t1 is 4.8 s at 12,000 rpm, according to VDI 2852.
- Table diameter is 770 mm.
- Total weight is 25,200 kg with pallet changer and 21,500 kg without.
- Five motorized spindle versions are offered: HSK-A63 83 Nm at 12,000 rpm, HSK-A63 206 Nm at 16,000 rpm, HSK-A63 47 Nm at 18,000 rpm, HSK-A100 575 Nm at 9,000 rpm, and HSK-A100 340 Nm at 10,000 rpm.
- A-axis swivel range is 230 degrees; B-axis swivel range is 360 degrees.
- Tool length for the single disk-type tool magazine is 465 mm outside (HSK-A63); for the compact double disk-type tool magazine it is 500 mm outside and 200 mm inside (HSK-A100).
- Automation options are a pallet changer, a linear pallet storage system (PSS-L) and a rotary pallet storage system (PSS-R) for up to 13 pallets.
- High-pressure cutting fluid systems are available at 23, 5-40 and 10-80 bar; hand-held controller options are SIEMENS or HEIDENHAIN.
- A stated example is a steel vise bottom part of 415 x 130 x 115 mm machined with a 9,000 rpm motorized spindle at 65 kW / 575 Nm.

## Sources

1. [G550a](https://www.grobgroup.com/en/products/product-range/universal-machining-centers/milling-centers/g550a/) (accessed 2026-10-26)

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