Twin Spindle Turning Center With Four Turrets

With twin spindles and four turrets, the Nakamura-Tome WTW-150 can turn complex precision parts in a single setup. Independent slides, 13 controlled axes, equal left and right machining and 48 stations of flexible tooling provide unmatched flexibility and productivity. Dual Fanuc CNCs allow independent programming of each spindle.

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With twin spindles and four turrets, the Nakamura-Tome WTW-150 can turn complex precision parts in a single setup. Independent slides, 13 controlled axes, equal left and right machining and 48 stations of flexible tooling provide unmatched flexibility and productivity.

Dual Fanuc CNCs allow independent programming of each spindle. Each spindle is capable of independent four-axis turning, and each offers C-axis control for infinite spindle positioning and continuous feed. But operators can use both spindles and all four turrets to machine both ends of a part simultaneously, reducing cycle times. Or they can use the upper and lower turrets to perform simultaneous milling and drilling operations, reducing cycle times and eliminating the time and expense of refixturing the part on a machining center for secondary processing. And by synchronizing the spindles, users can cut a single part--even an asymmetrical one--using four turrets simultaneously for minimum cycle times.

The WTW-150's polygonal turning capability produces squares and hexagons at high speed, cutting chamfer, flat-face and tapered polygons even in the middle of a workpiece. This capability further reduces cycle times compared with the traditional "single pass" milling methods of producing multiple flat surfaces.

The WTW-150's twin spindles have 6" chucks and maximum speeds from 4,000 to 8,000 rpm (depending on bar size) in 3.6 seconds. An integral 10-hp high-torque motor directly drives each spindle with no slippage or vibration. The absence of pulleys improves turning roundness. Spindles are oil cooled to reduce thermal growth, and both the hydraulic and the cooling units are thermally isolated to avoid heat transfer. Maximum turning diameter is 12.2", and maximum turning length is 10.04". Distance between spindles is 42.13".

Each of the machine's four turrets provide extreme rigidity and houses a 5-hp milling spindle with a maximum speed of 6,000 rpm in 0.4 seconds. Each turret also holds 12 live tools for milling, drilling and tapping. Chip-to-chip time is 1.4 seconds.

To meet different manufacturing challenges, options include automatic bar feeders, gantry loaders, work stockers, shaft loaders and unloaders, parts catchers, tool setters and high-pressure coolant pumps. For Y-axis applications, a 1.3-hp AC servo unit with ±30 mm (1.18") travel is available on both upper turrets. Optional circular and helical interpolation provide full cutter radius compensation, virtually eliminating special holders previously required when working above and below centerline.

Interactive control allows the programming of simple or complex components more quickly than with conventional programming, the company says. 3D animation visually depicts how the work is proceeding.