# GROB G520

Hardware · `G520` · verification: source checked

The GROB G520 is a two-spindle modular machining center for automotive series production. It machines two parts in parallel and can be equipped with an integrated pallet changer to handle dissimilar parts without change-over times. Working travels are 750/1,000/870 mm in X/Y/Z, with maximum axis speeds of 95/70/120 m/min.

## Specification

| Property | Value |
|---|---|
| Category | cnc mill |
| Travel X | 750 mm |
| Travel Y | 1000 mm |
| Travel Z | 870 mm |
| Spindle max | 18000 rpm |
| Rapid traverse | 120 m/min |

## Connected

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

## Study notes

- Working travels X/Y/Z: 750/1,000/870 mm. Maximum axis speeds X/Y/Z: 95/70/120 m/min.
- Positioning accuracy X/Y/Z: 0.006 mm. Chip-to-chip time t1: 2.1 s according to VDI 2852.
- Interference diameter: 2 x 798 mm.
- Total weight: 22,500 kg without pallet changer, 28,500 kg with pallet changer.
- Table load: 2 x 625 kg without pallet, 2 x 525 kg with pallet (A-/B-axis).
- Typical crankcase machining example: motorized spindle 18,000 rpm, 29 kW / 34.6 Nm.
- Motorized spindle versions include HSK-A63 and HSK-A100 with ratings from 6,000 to 18,000 rpm and 47 Nm to 344 Nm.
- CNC control options: SIEMENS (standard), FANUC (option); specific controller models are not stated.
- Tool magazine options: single-disk, double-disk and triple-disk; tool pockets in the magazine are expandable.
- GROB Spindle Diagnostics (GSD) monitors motorized spindle condition. GROB Chip-in-Spindle Detection System (SiS) detects chips between the plain surface and spindle nose from 10 μm.
- Loading options: top loading with agile loading gantry, Cartesian linear gantry or Cartesian linear gantry with telescope; front loading with automatic sliding changer or swiveling changer.
- Axes are divided into tool side and part side according to the modular concept.

## Sources

1. [Machining center G520](https://www.grobgroup.com/en/products/product-range/machining-technology/g-modules/g520/) (accessed 2026-10-26)

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