# INDEX G420

Hardware · `G420` · verification: source checked

The INDEX G420 is a turn-mill center for complete turning and milling of large workpieces. It has main and counter spindles, a 400 mm chuck, bar capacity up to 120 mm, and a working area that can take up to three tool carriers with Y axes. The document lists tool stock up to 139 tools for the G420 and an iXpanel iX4.0 control based on Siemens SINUMERIK 840D sl.

## Specification

| Property | Value |
|---|---|
| Category | cnc multitasking |
| Travel X | 750 mm |
| Travel Z | 1600 mm |
| Spindle max | 3000 rpm |
| Spindle taper | HSK-T63 / Capto-C6 |
| Rapid traverse | 50 m/min |
| Bar capacity | 120 mm |
| Max workpiece diameter | 400 mm |

## Connected

- Manufacturer: [INDEX-TRAUB](https://machineschema.com/manufacturer/index-traub.md)

## Study notes

- The technical data section covers INDEX G400 and INDEX G420 together; slash-separated values are not individually assigned in the document.
- Turning length is listed as 1,600 / 2,300 mm; the long version measures 5,060 x 3,025 x 3,165 mm and weighs 23,000 kg.
- Main spindle torque at 100% / 40% duty is 800 / 1,000 Nm; power at 100% / 25% duty is 34 / 43 kW.
- Milling spindle tooling systems: HSK-T63 and Capto-C6; maximum speeds 12,000 rpm and 18,000 rpm; maximum power 26 kW and 27.5 kW; maximum torque 150 Nm and 100 Nm.
- Turret tooling systems include HSK-T63 / Capto-C6 and VDI-40; turrets have 12 stations; driven-tool maximum speed is 5,400 rpm.
- B-axis swivel angle is +205 / -25 degrees (+/-115 degrees).
- Tool stock up to 139 tools is stated for INDEX G420; the technical data table also lists max. 58 / 115 tool places for G400 & G420.
- Working area can accommodate up to three tool carriers, each with a Y axis; simultaneous 5-axis machining is possible.
- Optional integrated workpiece handling has 2 CNC axes and handles parts up to 25 kg and diameter 120 mm.
- Control is iXpanel iX4.0 based on Siemens SINUMERIK 840D sl; this controller is not in the provided controller list.
- Connecting power is 112 kW for the long version.
- Slide travel Y is listed as +/-170 mm; tool weight max 10 kg, tool diameter max 160 mm, tool length max 500 mm.

## Sources

1. [Turn-mill center INDEX G400 / INDEX G420](https://www.index-group.com/en/products/turn-mill-centers/index-g400-index-g420) (accessed 2026-10-26)

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Source page: https://machineschema.com/hardware/index-traub-g420  
JSON: https://machineschema.com/hardware/index-traub-g420.json  
License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Cite Machine Schema and the original sources.