With many new and improved functions, the 6-spindle INDEX MS52 CNC multi-spindle automatic lathe (spindle clearance of 52 mm) with up to 12 cross-slides in the work area is also setting standards in rear end machining. Innovative features include the liquid-cooled spindle drum as well as the cross-slides with hydrostatic bearing support and directly integrated motor.
The MS52 has been effectively deployed in many industries including the automotive, mechanical and medical technology, producing large runs as well as small batches efficiently and economically. Another benefit for the user is that all standard tool holders and tool holder system interfaces can be used with the appropriate adapters (Capto, HSK, VDI, INDEX systems).
The fluid-cooled spindle drum keeps the thermal growth in the spindle carrier to a minimum. The six spindles, which are stored in a newly developed spindle drum and for which a patent application has been filed, are cooled according to need. The advantage compared to the previous air-cooled approach is the higher power density in the spindle drum and the option of energy recovery from the heated cooling fluid. In addition, the spindle bearing temperature can be kept at a low level, which also prolongs its service life and improves thermal stability.
Each of the six spindles is assigned two cross-slides which can be operated both on the X as well as on the Z-axis. Each cross-slide can be additionally equipped with a Y-axis. Tool holders with up to two stationary tools or a turret can be mounted on each cross-slide. The turret holds up to three stationary or live tools. Furthermore, drive units can be installed on the cross-slides for additional machining such as milling or cross-drilling.
Hydrostatic sliding guides for vibration-free multi-machining
The cross-slides with integrated motor have a low-mass design with hydrostatic bearing support. They are appealing due to their low moment of inertia and the resulting high dynamics, which facilitates outstanding acceleration in practical application.
The advantage of a hydrostatic sliding guide in the feed axis (Z) is its outstanding damping characteristic that prevents the transfer of the machining vibrations to the adjacent slide via the headstock. This helps to mitigate vibration and rattling while workpieces are being machined – even when the most diverse machining processes are being performed concurrently by the six spindles.
For example, one spindle can be used for heavy-duty roughing while high-precision finishing takes place on another spindle without the risk of chatter marks or other impaired surface quality. In addition, the hydrostatic bearing is wear-free – there is neither friction nor a stick-slip effect.
Highly dynamic swiveling synchronous spindle and new drives
Another of the machine's highlights is its workpiece rear end machining capability, which is achieved using a swiveling synchronous spindle that is locked into the end positions by means of a three-part Hirth coupling. The high level of stiffness that this achieves also guarantees that even with bar diameters up to 52 mm, rear end machining operations with very high cutting volumes and simultaneously high machining precision can be performed.
The swiveling synchronous spindle stands out due to its remarkable dynamics, for example, it swivels to the rear end position in less than 0.4 s. For rear end machining, three stationary and up to two live tools are available.