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INDEX G420

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.

Source checked8/8 values · 2026-10-26INDEX-TRAUBCNC multitasking
Travel X
750mm
Travel Z
1,600mm
Spindle max
3,000rpm

Specification

1 source
Categorycnc multitasking
Spindle taperHSK-T63 / Capto-C6
Rapid traverse50 m/min
Bar capacity120 mm
Max workpiece diameter400 mm

Quick answers

What is the maximum spindle speed of the INDEX G420?
3000 rpm, per Turn-mill center INDEX G400 / INDEX G420 (index-group.com).
What is the X-axis travel of the INDEX G420?
750 mm, per Turn-mill center INDEX G400 / INDEX G420 (index-group.com).

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.
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