Hwacheon MEGAIII-200

The Hwacheon MEGAIII-200 is a heavy horizontal lathe for long, heavy shafts and rolls: Ø2,000 mm (Ø78.74 in) maximum turning diameter over the bed, a 63 in chuck and up to 17,000 mm (669.29 in) between centres. It comes in five lengths between centres, 6,000, 8,000, 10,000, 12,000 and 17,000 mm, and Z travel grows with them from 6,300 mm (248.03 in) to 17,300 mm (681.1 in). X travel is 900 mm (35.43 in) whichever length is chosen.

The headstock is built for torque, not speed. Spindle speed is 1 ~ 130 rpm across three automatic steps, the drive is rated 136 / 92 kW (182.38 / 123.37 hp), and rated torque is 12,713 kgf·m (124,672 Nm) on a special Ø300 x 280 spindle nose. On a part near the Ø2,000 mm limit, 130 rpm already gives a working surface speed, so the low ceiling matters mainly on the smaller diameters of a stepped shaft.

Workpiece weight is 25 t (55,115 lb) as standard and 40 t as an option. The built-in tailstock has a Ø450 mm (Ø17.72 in) quill, Ø600 mm (Ø23.62 in) as an option, 300 mm (11.81 in) of quill travel and a Ø160 x 75° fixed centre. Tools sit on an electric 4-way square tool post, □440 mm, with 4 positions for □40 mm shanks (□50 mm optional) and Dia.60 mm bars.

Against the MEGAIII-160, this model swings Ø2,000 mm (Ø78.74 in) instead of Ø1,600 mm (Ø62.99 in), takes a 63 in chuck instead of a 40 in one, and has 12,713 kgf·m of torque against 5,488 kgf·m, with 130 rpm at the top instead of 325 rpm. The MEGAIII-260 keeps this headstock and drive and raises the swing to Ø2,600 mm (Ø102.36 in).

Site preparation is a project of its own. Overall length is 13,500 mm (531.5 in) with the 6000 bed and 24,500 mm (964.57 in) with the 17000 bed, width 4,200 mm (165.35 in) and height 3,425 mm (134.84 in). The machine weighs 77 t (169,754 lb) with the 6000 bed and 106 t (233,688 lb) with the 17000 bed, needs 200 kVA at 380 V, 60 Hz, and runs a SIEMENS 828D control.