Latest Y-axis, sub-spindle turning centre

The next-generation Y-axis, sub-spindle Doosan Puma 2600SY Mk II turning centre series is now available from Mills CNC. Although the new machines are equipped with a 10” chuck, unlike Puma 2600SY Mk I models, they have a larger 81 mm bar diameter capacity. The machines are also supplied with built-in type spindles (as opposed to belt-driven spindles), which generate less vibration during cutting operations.

Further innovations include six strategically positioned heat sensors that automatically monitor and compensate for any thermal displacement during machining operations. In addition, the spindles feature a reconfigured bearing structure comprising two angular-contact bearings and two taper roller bearings to improve C-axis positional accuracy and spindle runout (less than 6 µm).
The Puma 2600SY Mk II uses high-performance NTN material (as opposed to Turcite) on its box-guideway axes, a move that is said to result in improved and more responsive movement, and reduced wear. Other performance improvements include a revised design of milling turret that incorporates a Curvic coupling piston structure delivering up to 12% additional clamping force; improved durability of the Y-axis carriageway; and a spindle air-purge function that helps prevent chip and coolant ingress.
The machine was exhibited for the first time in the UK at the recent Mills CNC open house, which took place in October.
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