Latest CNC mill/turn centre with a heavy duty boxway construction sets a new standard in turning and milling operations through the combination of high power and rigidity at both spindles.

The latest SKT 250MS turn/mill centre from Hyundai Kia introduces a 22kW main spindle having a 10in (12in option) chuck with a high capacity 8in chuck subspindle powered by an 11kW drive that is serviced by a 12 position quick-change all-driven 5.5kW motor turret. Adding to the capability of the machine for heavier duty and accurate cutting is its availability in bar feed format with 76mm stock size capacity in the main spindle and 65mm in the subspindle with full C-axis at each spindle to provide a contouring capability. According to UK distributor C Dugard of Hove, Sussex, this latest SKT 250MS with its heavy duty boxway construction, sets a new standard in turning and milling operations through the combination of high power and rigidity at both spindles coupled with high flexibility and features available through the Fanuc 18i-TB, six-axis control.

The 45 deg slant bed of the machine is a single heavy-duty casting with significant ribbing to absorb vibration and a through bore with a large 90mm diameter thermally symmetrical design of headstock.

The machine has a high speed, gearless drive to generate a smoother operation and enables heavy-duty cycles to be performed.

Cutting trials have recorded the machine is capable of maintaining roundness within +0.5 microns and has the ability to achieve a constant cutting accuracy of +3.5 microns.

The capacity is large within a maximum swing of 620 mm and a turning diameter of 410mm by 720mm long.

Travel in the X-axis is 290mm, Z-axis is 750mm and B-axis is 700mm with rapid traverse rates of 20m/min in X and B and 24m/min in Z.

Reflecting the capacity of the machine, the main spindle has a maximum speed of 3,500 rev/min and the subspindle 4,000 rev/min while the high performance AC servo driven turret, with a very rigid three-piece 5.560kgf coupling, has an indexing time of 0.3s/position.

The maximum speed of the driven tools is 4,000 rev/min powered by 5.5kW motor able to accommodate tool shank sizes up to 20mm diameter and rigid tap up to M16 thread size.

Included in the specification is the well-proven Q-setter for automatic determination of tool offsets, that eliminates the need for trial cuts, measurement and offset input.

Options include a parts-catcher for bar feed applications, high pressure coolant and swarf management.

Automatic work co-ordinate setting is available through direct input of depth-of-cut at the Fanuc control.