Universal CNC turning centre Modular machine design ensures high-precision and dynamic operations

Editor: Alexander Stark

The new Maxxturn 65 G2 from Emco has undergone an extensive redesign and, in addition to two powerful motor spindles, now also offers an optional BMT turret with direct drive. For the first time, three spindle sizes can be offered. A steady rest is available for shaft machining if required. While the proven two-part basic design has been retained, the integration of the chip conveyor has been optimised.

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The Maxxturn 65 G2 ensures steady rest for shaft machining.
The Maxxturn 65 G2 ensures steady rest for shaft machining.
(Source: Florian Stuerzenbaum/Emco)

With its modular design, the Maxxturn 65 G2 offers a wide range of options for specific customer requirements. The high drive power of the main and counter spindles, combined with optimum torque characteristics, ensures economic efficiency in the machining of steel as well as in the high-speed machining of aluminium. Twelve driven tools and a Y-axis ensure high-quality results in complex milling and drilling operations. With numerous automation solutions and the Emconnect digital process assistant, the Maxxturn 65 G2 enables low-manpower production in operation.

The core of the machine is the 40 ° inclined bed. Designed as a rigid and compact welded steel construction, it is the basis for a robust and precise lathe. Reinforcements provide additional rigidity in zones exposed to higher stress. As a further development of the Maxxturn 65 G1, the machine features a new design. The optimised integration of the chip conveyor ensures compact dimensions. Instead of belt drives, spindle motors are used on the main and counter spindles, which provides for a speed range of up to 5000 rpm and good concentricity properties. Three main spindle sizes are available depending on customer requirements: Standard Ø 65 mm / Big Bore Ø 77 mm / Super Big Bore Ø 95 mm. A symmetrically designed headstock, together with temperature sensors at the bearing points and liquid cooling, ensure high thermal stability.

Control is provided with the digital process assistant Emconnect.
Control is provided with the digital process assistant Emconnect.
(Source: Emco)

The C-axis is part of the basic machine equipment and allows the positioning of the spindle within a resolution of 0.001 °. Due to the directly flanged encoder, the C-axis is ideally suited for contour-precise milling; a hydraulic holding brake (option) can be additionally activated. The Y-axis is also integrated in the basic machine structure and set at 90 ° to the X-axis. Very short projection lengths form the basis for solid turning and drilling operations as well as contour-free milling operations. Absolute measuring systems are installed in all linear axes - position dispersion as per VDI3441 in X/Y/Z: 0.0035/0.0035/0.004 µm as standard / 0.002/0.002/0.002 µm as an option, with glass scales and laser measurement.

The machine has numerous modular options and is available in different versions:

  • MT65 G2 M: incl. tool drive, C-axis and tailstock
  • MT65 G2 MY: incl. tool drive, C-axis, Y-axis and tailstock
  • MT65-G2 SM: incl. counter spindle, tool drive and C-axis
  • MT65-G2 SMY: incl. counter spindle, tool drive, C-axis and Y-axis

On the MT65M-G2 with tailstock, the tailstock is mounted on the roller guide track and can be moved automatically over a length of 500 mm. A drag steady rest with Ø 8-101 mm is optionally available. This ensures even more flexible use of the machine, e.g. for shaft machining. On the MT65S-G2 with counter spindle, the counter spindle head is seated on its own roller guide track and can be moved automatically over a length of 580 mm. The spindle is driven by an integrated spindle motor (ISM) with liquid cooling. A stroke-monitored parts ejector, flooded with coolant, ensures safe removal of the finished parts. In addition, a 12-station VDI30 turret (optionally VDI 40) with single-motor technology is available. A servo motor powers the driven tools or the swivel movement — no lift-off and indexing with directional logic are the result. Each station can accommodate driven toolholders; alternatively, a 12-station BMT55 turret with direct drive, with up to 12000 rpm, or even a 16-station BMT45 turret can be integrated.

The customers can choose between the Sinumerik One or the Fanuc 31i-B control system. The control panel on the machine is height-adjustable on the right and can be swivelled, which ensures the best ergonomics. 22" multi-touch screens improve the view of individual control functions.

The optional digital process assistant Emconnect enables connectivity and networking of the production environment and helps with the comprehensive integration of customer- and system-specific applications around the machine control and the production process. It can be easily updated and configured, and the selection of available apps is constantly being expanded. For example, the Shopfloor Management app serves as an option for machine and production data acquisition, enabling comprehensive monitoring of all machines and organisation of processes in the production area. Apps for minimising downtimes are also available with Emconnect.

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