INDEX G250

$280,000 - $420,000 Updated 2026-03-16

Key Specifications

Rapid Traverse

30 m/min (X and Z)

Max Turn Length

650 mm (25.59 in)

max turning diameter

250 mm (9.84 in)

max bar capacity

65 mm (2.56 in)

main spindle speed

Up to 5,500 RPM

main spindle drive

33 kW (44.2 hp)

Overview

The INDEX G250 is a multi-axis universal turning center from INDEX-Traub, positioned as the mid-range model in the G series between the G200 and G300. The G250 brings full Y-axis capability, a sub-spindle, and driven tools to a machine sized for workpieces up to 250 mm swing, making it well-suited for complete machining of complex small-to-medium parts in a single setup. This complete machining philosophy—turning, milling, drilling, and threading in one clamping—is the defining value proposition of the G series and the reason it dominates precision component production in European automotive and medical supply chains.

The G250 employs dual-channel Siemens 840D sl control, enabling simultaneous operation of the main and sub-spindle with full synchronization. The main spindle accommodates bar stock up to 65 mm through the standard spindle bore, with chuck work capacity up to 250 mm. The Y-axis provides ±50 mm of off-center travel for eccentric milling, keyway cutting, and complex prismatic feature machining that would otherwise require a secondary VMC setup. Live tooling positions on the turret reach speeds up to 8,000 RPM, enabling efficient milling and drilling operations within the turning cycle.

INDEX's polymer concrete (Mineralit) machine bed design underpins the G250's vibration damping characteristics, achieving better thermal stability than conventional cast iron beds. This contributes to the G250's ability to maintain tight tolerances over long production runs—a requirement for automotive injection components, medical implants, and hydraulic precision parts where dimensional drift over time is not acceptable.

The G250 competes with the DMG Mori NLX 2500, Mazak Quick Turn Nexus, and Okuma LB3000 EX in the mid-range turning center segment, differentiating through its INDEX build precision, the Mineralit base, and deep integration with INDEX's automation options including bar feeders, gantry systems, and the INDEX iXpanel operator interface.

Full Specifications

Parameter	Value
Max Turning Diameter	250 mm (9.84 in)
Max Bar Capacity	65 mm (2.56 in)
Max Turning Length	650 mm (25.59 in)
Main Spindle Speed	Up to 5,500 RPM
Main Spindle Drive	33 kW (44.2 hp)
Sub Spindle Speed	Up to 7,000 RPM
Y Axis Travel	±50 mm (±1.97 in)
Turret Positions	12-position VDI servo turret with live tooling
Live Tool Speed	8,000 RPM
Rapid Traverse Rate	30 m/min (X and Z)
CNC Control	Siemens 840D sl (dual-channel)
Machine Weight	Approx. 9,500 kg (20,944 lb)
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-D (Siemens 840D)
Main Spindle Turning Diameter Max	12.000"
Main Spindle Turning Length Max	55.000"
Main Spindle Chuck Diameter	7.900"
Main Spindle Chuck Diameter Opt	12.400"
Main Spindle Max Swing	22.000
Main Spindle Bar Diameter Max	2.600"
Main Spindle Bar Diameter Opt	4.020"
Tail Stock Quill And Body	Optional
Num Main Spindles	2
Main Spindle 1	RPM:5,000HP:76.00Index Increment:RPM Opt:3,500HP Opt:80.00
Rpm5000	HP:76.00
Rpm Opt3500	HP Opt:80.00
Main Spindle 2	RPM:5,000HP:76.00Index Increment:RPM Opt:3,500HP Opt:80.00
Primary Tool Carrier	Turret 1,3 Top
Max Tools	Turning:Rotary:1212
Turning	Rotary:
Rotary Tool	HP:RPM:12.706,000
Hp	RPM:
Second Tool Carrier	Turret 2 Lower
Num Simultaneous Cutting Tools	1
Num Simultaneous Cutting Tools Opt	2
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	11.800"
Z Axis	31.000" Opt: 55.000"

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

Strengths & Limitations

Strengths

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Limitations

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Best For

Precision automotive Tier 1 suppliers producing complex turned components—fuel injector bodies, transmission shafts, ABS sensor housings—requiring complete machining in a single setup Medical device manufacturers producing small implants, surgical instruments, and precision component assemblies where dimensional accuracy and surface finish are paramount Hydraulic and pneumatic component producers machining spool valves, manifold bodies, and precision fittings requiring both turning and milling features High-value contract manufacturers serving aerospace, defense, and energy sectors where part complexity and quality requirements justify premium machine investment

Frequently Asked Questions

01 What is the difference between the INDEX G200 and G250?

The G250 offers greater swing capacity (250 mm vs approximately 200 mm), larger bar capacity (65 mm vs 52 mm), and a longer turning length than the G200. Both share the Siemens 840D sl control, Y-axis, and sub-spindle architecture. The G250 is the better choice for shops whose part mix includes components at the upper end of the small-to-medium turning range.

02 What does an INDEX G250 cost?

New INDEX G250 turning centers typically range from $280,000 to $420,000 depending on sub-spindle configuration, live tooling count, automation interface, and control options. Used G250 machines are occasionally available through European machine tool dealers at $120,000–$220,000.

03 What is Mineralit and why does it matter?

Mineralit is INDEX's proprietary polymer concrete composite used for machine bases instead of conventional cast iron. It provides 6–8 times better vibration damping than cast iron, resulting in better surface finish, reduced tool wear, and improved thermal stability—particularly important for precision turning applications with tight tolerance requirements.

04 Can the INDEX G250 run lights-out?

Yes. The G250 is well-suited for lights-out operation when paired with a bar feeder (for bar work) or a gantry loader/robot (for chuck work). The Siemens 840D sl control supports tool life management, automatic offset updates, and alarm response protocols that enable extended unattended operation.

05 How does the G250 compare to a DMG Mori NLX 2500?

Both are high-quality European/Japanese universal turning centers with Y-axis and sub-spindle. The INDEX G250 differentiates through its Mineralit polymer concrete base for superior vibration damping and the deep integration with INDEX's automation ecosystem. The DMG Mori NLX 2500 offers a broader global service network and the CELOS control interface. The choice often comes down to regional service availability and existing fleet compatibility.