INDEX C400

$550,000 - $800,000 Updated 2026-03-16

Key Specifications

Rapid Traverse

35 m/min (X, Z), 24 m/min (Y)

Max Turn Length

600 mm (23.62 in)

max bar capacity

65 mm (2.559 in)

max turning diameter

120 mm (4.72 in)

main spindle speed

5,500 RPM

counter spindle speed

5,500 RPM

Overview

The INDEX C400 is the mid-size turn-mill machining center in INDEX-Traub's C series, providing 65mm bar capacity with full 5-axis simultaneous machining capability including B-axis and expanded Y-axis stroke. The C400 addresses the growing demand from aerospace, medical, and energy sectors for complete machining of medium-size precision components that combine complex turning, milling, and drilling operations in demanding alloys.

The C400's expanded bar capacity over the C200—from 52mm to 65mm—opens the machine to a wider range of component families including larger aerospace connectors, medium-size orthopedic implant components, energy sector precision parts, and complex automotive drivetrain components. The 65mm bar capacity class represents a significant segment of the complex parts market where turn-mill capability delivers meaningful cost and quality advantages over multi-machine sequential processes.

INDEX's B-axis milling spindle on the C400 provides an expanded angular range and greater milling spindle power than the C200, reflecting the heavier cutting requirements of 65mm diameter work in titanium, Inconel, and high-strength steel. The larger Y-axis stroke accommodates the wider part geometries encountered at this diameter class, and expanded turret capacity provides the tooling density to complete multi-operation sequences without tool changeover interruptions.

The C400 is built on INDEX's proven C-series architecture with Siemens 840D sl control and INDEX's iXpanel interface, providing the programming environment, simulation tools, and machine connectivity that INDEX's sophisticated customers expect. For shops running medium-size complex components that currently require separate turning and milling operations, the C400 offers a compelling consolidation argument backed by INDEX's reputation for German-engineered precision and durability.

Full Specifications

Parameter	Value
Max Bar Capacity	65 mm (2.559 in)
Max Turning Diameter	120 mm (4.72 in)
Max Turning Length	600 mm (23.62 in)
Main Spindle Speed	5,500 RPM
Counter Spindle Speed	5,500 RPM
Milling Spindle Speed	10,000 RPM
Number Of Axes	5 simultaneous (X, Y, Z, B, C + counter spindle)
B Axis Range	−10° to +210°
Turret Stations	16 (VDI 40)
Y Axis Stroke	±70 mm
CNC Control	Siemens 840D sl (INDEX iXpanel)
Rapid Traverse Rate	35 m/min (X, Z), 24 m/min (Y)
Machine Weight	11,000 kg (24,251 lb)
Floor Space	4.2 m × 2.8 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))

Strengths & Limitations

Strengths

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Limitations

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Best For

Aerospace manufacturers machining complex connectors, hydraulic manifolds, and structural components in titanium and high-strength aluminum in the 40-65mm range Medical device manufacturers producing large orthopedic implant components and surgical instrument bodies requiring 5-axis turn-mill capability Energy sector suppliers machining precision components for turbines, pumps, and downhole equipment in difficult alloys Contract manufacturers competing for complex mid-size component programs requiring 5-axis simultaneous machining and complete part production in a single cycle Defense manufacturers machining complex precision components for avionics, guidance systems, and propulsion hardware Shops consolidating three or more sequential machining operations (turning, milling, grinding prep) into a single C400 program

Frequently Asked Questions

01 What is the price of an INDEX C400?

A new INDEX C400 typically ranges from approximately $550,000 to $800,000 depending on configuration, tooling package, and automation options. As a precision German-built turn-mill machining center, the C400 is priced to reflect its engineering content and long machine life.

02 What is the lead time for an INDEX C400?

INDEX turn-mill machining centers are typically configured to order, with lead times ranging from 6 to 12 months depending on configuration complexity and production scheduling at INDEX's Esslingen, Germany manufacturing facility.

03 How does the C400 differ from the C200?

The C400 offers 65mm vs 52mm bar capacity, a more powerful milling spindle, larger VDI 40 tooling interface (vs VDI 30 on C200), 16 vs 12 turret stations, wider Y-axis stroke, and greater overall machine rigidity for heavier cuts in difficult materials. The C400 is the appropriate choice when 65mm capacity or greater milling power is required.

04 What materials does the INDEX C400 handle well?

The C400 is suited for the full range of aerospace and medical materials: titanium (Ti-6Al-4V, Ti-5553), nickel superalloys (Inconel 718, 625), high-strength steel (4340, H13), stainless steel, and aluminum. The machine's rigidity, spindle power, and thermal management are all optimized for these demanding material families.

05 Does the INDEX C400 support automation integration?

Yes. The C400 is designed for automation integration including bar feeders for bar stock operations and robot loading systems for chucked work. INDEX offers automation packages and the machine's design includes robot access ports and standardized interfaces. INDEX Connect provides machine data connectivity for Industry 4.0 integration.