INDEX G400

$500,000 - $750,000 Updated 2026-03-16

Key Specifications

Rapid Traverse

25 m/min

number of spindles

max bar capacity

40 mm (1.575 in)

max turning diameter

60 mm (2.36 in)

max machining length

150 mm (5.91 in) per spindle position

spindle speed

Up to 6,000 RPM per spindle

Overview

The INDEX G400 is a 4-spindle CNC automatic lathe from INDEX-Traub, engineered for high-volume precision turning of components up to 40mm bar diameter with the throughput advantages of multi-spindle architecture combined with CNC flexibility and programmability. The G400 targets the production gap between single-spindle CNC turning centers and traditional cam-type multi-spindle automatics, delivering significantly higher output than single-spindle machines while providing CNC programmability that cam-type machines cannot match.

With 4 spindles operating simultaneously on 4 parts at different stages of completion, the G400 achieves effective cycle times far below what a single-spindle machine can achieve for the same part. Each spindle position executes a portion of the part's operation sequence, with parts advancing through spindle positions until completion—a workflow that maintains continuous production output even when individual spindle operations are lengthy.

The G400 is particularly valuable for automotive, industrial fastener, and precision component applications where volumes justify the multi-spindle investment but part complexity has evolved beyond what cam-type automatics can accommodate. CNC programmability enables rapid changeover between part families—a significant advantage over cam-type automatics that require physical cam changes for each new part—making the G400 viable for medium-run production programs.

INDEX's Siemens 840D sl control manages the complex multi-spindle coordination, and the machine's German-engineered precision construction ensures the dimensional consistency and long-term accuracy required for high-volume automotive and industrial production. For production volumes above what single-spindle machining can support economically, the G400 provides a compelling path to higher throughput without the changeover limitations of cam-type multi-spindle machines.

Full Specifications

Parameter	Value
Number Of Spindles	4
Max Bar Capacity	40 mm (1.575 in)
Max Turning Diameter	60 mm (2.36 in)
Max Machining Length	150 mm (5.91 in) per spindle position
Spindle Speed	Up to 6,000 RPM per spindle
Live Tool Speed	6,000 RPM
Number Of Axes	Up to 2 axes per spindle position + live tool axes
Tool Positions	Up to 6 tools per spindle position
CNC Control	Siemens 840D sl
Rapid Traverse Rate	25 m/min
Machine Weight	14,000 kg (30,865 lb)
Floor Space	5.0 m × 3.0 m
Guest Name	Dietary Restriction
David	None
Bob	None
Nancy	None
Mary	Vegetarian
Formula	Formula Output
Index	3
Goal	Formula
Find Marys Dietary Restriction	=INDEX(A1:D6, MATCH("Mary", A1:A6, 0), MATCH("Dietary Restriction", A1:D1, 0))
Find Who Is At Table Number 2	=INDEX(A1:D6, MATCH(2, D1:D6, 0), MATCH("Guest Name", A1:D1, 0))
Machine Style	Bar, Chucker, Universal
Spindle Direction	Horizontal
Operation Type	CNC
Cnc Type	C200-4D (Siemens 840D)
Main Spindle Turning Diameter Max	24.000"
Main Spindle Turning Length Max	78.000"
Main Spindle Chuck Diameter	12.400"
Main Spindle Chuck Diameter Opt	15.750"
Main Spindle Max Swing	24.800
Main Spindle Bar Diameter Max	3.540"
Main Spindle Bar Diameter Opt	4.020"
Tail Stock Quill And Body	None
Num Main Spindles	2
Main Spindle 1	RPM:3,500HP:76.00Index Increment:RPM Opt:3,000HP Opt:93.00
Rpm3500	HP:76.00
Rpm Opt3000	HP Opt:93.00
Main Spindle 2	RPM:3,500HP:76.00Index Increment:RPM Opt:3,000HP Opt:93.00
Primary Tool Carrier	Turret 1,3
Max Tools	Turning:Rotary:1010
Turning	Rotary:
Rotary Tool	HP:RPM:37.0012,000
Hp	RPM:
Second Tool Carrier	Turret 2
Num Simultaneous Cutting Tools	2
Num Simultaneous Cutting Tools Opt	3
Secondary Mill Drill Function	On-CenterOff-CenterWith 'C' AxisWith 'Y' AxisOptionalOptionalOptionalOptional
On Center	Off-Center
Optional	Optional
Num Axes	5
Number Of Axes Opt	6
Number Of Axes Opt 2	6
X Axis	12.600"
Z Axis	49.200" Opt: 78.700"

Specifications sourced from techspex.com — verified 2026-03-28

Strengths & Limitations

Strengths

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Limitations

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Best For

Automotive Tier 1 and Tier 2 suppliers producing high-volume precision turned components (valve bodies, shafts, bushings) in the 20-40mm range Industrial fastener manufacturers producing precision bolts, studs, and threaded components at high volumes Hydraulic and pneumatic component manufacturers machining spool valves, connectors, and cylinder components in volume Contract manufacturers with committed long-run programs that justify multi-spindle setup investment Shops transitioning from cam-type multi-spindle automatics seeking CNC programmability with maintained throughput Precision component manufacturers with annual volumes above 500,000 parts per year on a specific component family

Frequently Asked Questions

01 What is the INDEX G400 price?

A new INDEX G400 typically ranges from approximately $500,000 to $750,000 depending on configuration, tooling package, and options. The investment is justified by significantly higher throughput than single-spindle alternatives on high-volume programs.

02 How does the G400 differ from the INDEX MS series?

The MS series are 6- and 8-spindle machines for maximum throughput on very high-volume, simpler parts. The G400's 4-spindle configuration provides a middle ground: higher throughput than single-spindle but more flexible changeover and better suited to moderate complexity parts than the MS series' pure throughput orientation.

03 What is the minimum run length for G400 to be economical?

The G400's economics typically favor programs with run lengths of 10,000 parts or more per setup, though this depends on part complexity and cycle time. High-value parts with significant secondary operation elimination can justify shorter runs. Shops should conduct detailed cost-per-part analysis comparing G400 against 3-4 single-spindle turning centers for their specific programs.

04 Can the G400 run more than one part program simultaneously?

The G400 is designed for single-part-family production where each spindle position processes a different operation stage of the same part. Running different part programs simultaneously across spindle positions is generally not the intended use case and would compromise the multi-spindle throughput advantage.

05 What control features help with G400 programming complexity?

The Siemens 840D sl provides multi-channel programming for coordinating the 4 spindle positions, simulation for program verification before cutting, and INDEX's programming cycles for standard turning, threading, and grooving operations. INDEX's applications engineering team provides programming support and can assist with post-processor setup for CAM-generated G400 programs.