Hwacheon MEGAIII-260

The Hwacheon MEGAIII-260 is the big-swing version of the MEGAIII heavy lathe, turning up to Ø2,600 mm (Ø102.36 in) over the bed with a swing of Ø2,650 mm (Ø104.33 in). Over the cross slide the swing is listed as Ø480 ~ Ø2,200 mm (Ø18.90 ~ Ø86.61 in). It is built for large rolls, drums and shafts that are both wide and long, with 6,000 to 17,000 mm (236.22 to 669.29 in) between centres depending on the bed chosen.

The extra swing is the whole difference from the MEGAIII-200, which turns Ø2,000 mm (Ø78.74 in) on the same 63 in chuck, special Ø300 x 280 spindle nose and 136 / 92 kW (182.38 / 123.37 hp) drive. To reach the larger diameter the 260 has 1,100 mm (43.31 in) of X travel, stands 3,725 mm (146.65 in) tall and sits on longer beds of 10,100 to 21,110 mm (397.64 to 831.1 in). Both machines share 1 ~ 130 rpm in three automatic steps and 12,713 kgf·m (124,672 Nm) of torque. Because the torque is fixed while the diameter grows, the cutting force available at the tool is lower at Ø2,600 mm than at Ø2,000 mm, which is worth checking for heavy roughing at full diameter.

Workpieces can weigh 25 t (55,115 lb), or 40 t with the option, and the built-in tailstock offers a Ø450 mm (Ø17.72 in) quill, Ø600 mm (Ø23.62 in) as an option, with 300 mm (11.81 in) of quill travel. Tooling is an electric 4-way square tool post of □440 mm holding 4 tools with □40 mm shanks (□50 mm optional).

For a disc-shaped part of similar size, the VT-2000 vertical lathe in the same catalogue turns Ø2,500 mm (Ø98.4 in) on a Ø2,000 mm (Ø78.7 in) table. The MEGAIII-260 is the choice when the part is long and must be held between centres. Machine weight runs from 81 t (178,573 lb) with the 6000 bed to 110 t (242,506 lb) with the 17000 bed, and the supply is 200 kVA at 380 V, 60 Hz with a SIEMENS 828D control.