INDEX B400

The INDEX B400 is a precision CNC turning and grinding center from INDEX-Traub, representing the manufacturer's capability in combined turning and grinding operations on a single machine platform. The B400 integrates CNC turning with internal and external cylindrical grinding capability, enabling complete machining of precision rotational components — particularly bearing journals, valve seats, and hydraulic components requiring both turned and ground surfaces — in a single machine setup without the repositioning errors that transfer between separate machines introduces.

The B400 accommodates bar diameters up to 65 mm (2.56 in) and workpieces up to 200 mm (7.9 in) turning diameter. The turning spindle provides up to 4,000 RPM with the torque for productive material removal, while the integrated grinding spindle operates at 24,000-36,000 RPM for cylindrical and internal grinding operations. The combined capability eliminates the need for a separate grinding machine and the associated part transfer, re-fixturing, and datum re-establishment that degrade final dimensional accuracy.

INDEX designed the B400 specifically for applications where hard turning alone cannot achieve the surface finish and dimensional accuracy required, but full cylindrical grinding on a separate machine adds too much cycle time and repositioning error. The machine uses INDEX's iXpanel control for unified programming of both the turning and grinding operations through a single program environment.

At $400,000-$600,000, the B400 targets precision manufacturers of hydraulic components, bearing elements, and precision shaft components where the turn-then-grind capability in a single setup produces measurably better results than two-machine sequences. This is a specialized machine for shops with consistent precision turned-and-ground part requirements rather than a general-purpose machine choice.