# GROB G720

Hardware · `G720` · verification: source checked

The GROB G720 is a modular two-spindle machining center for large-scale production. It can machine two components simultaneously and is assembled from modules to suit specific requirements. Working travels are 690/920/1,160 mm in X/Y/Z, total weight is 30,000 kg, and table load is up to 2,000 kg.

## Specification

| Property | Value |
|---|---|
| Category | cnc mill |
| Weight | 30000 kg |
| Travel X | 690 mm |
| Travel Y | 920 mm |
| Travel Z | 1160 mm |
| Spindle taper | HSK-A100 |
| Table load | 2000 kg |

## Connected

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

## Study notes

- Max. speeds in X/Y/Z axes are 50/38/60 m/min.
- Chip-to-chip time t1 is 6.0 s according to VDI 2852, relative to spindle speed.
- Positioning accuracy in X/Y/Z axes is 0.006 mm.
- Distance between spindles is 450–520 mm, with special solutions possible.
- Interference diameter is 1,350 mm.
- Motorized spindle versions listed are HSK-A100, 340 Nm at 6,000 rpm and HSK-A100, 340 Nm at 10,000 rpm.
- A crankcase machining example lists a motorized spindle at 18,000 rpm and power/torque of 29 kW/34.6 Nm.
- GROB Spindle Diagnostics (GSD) automatically monitors motorized spindle condition.
- GROB Chip-in-Spindle Detection System (SiS) detects tool clamping faults caused by chips from 10 μm.
- The document lists SIEMENS as a CNC control option; no specific SIEMENS controller model is given.
- Tilting rotary tables use torque motor technology.
- Loading options include top loading with agile loading gantry, Cartesian linear gantry, or Cartesian linear gantry with telescope, and front loading with automatic sliding changer or swiveling changer.

## Sources

1. [Machining center G720](https://www.grobgroup.com/en/products/product-range/machining-technology/g-modules/g720/) (accessed 2026-10-26)

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