INDEX G300

The INDEX G300 is a large turn-mill center for parts up to 280 mm (11 in) in diameter and 1,400 mm (55.1 in) long, with 102 mm (4 in) bar capacity and a main spindle rated 525 Nm continuous and 715 Nm at 40% duty. It sits between the G200 and G220 Plus, which turn 660 mm (26 in) long parts with 125 / 170 Nm, and the G400, which goes to 2,300 mm (90.6 in) on its long bed.

Power is the headline. The main spindle gives 44 kW continuous and 59 kW at 40% duty and runs to 4,000 rpm, a combination that suits heavy roughing of steel bar and forgings and still leaves usable speed for finishing on mid-size diameters. The counter spindle runs to 5,000 RPM.

Upper and lower turrets each have 12 stations with live tooling, and driven tools reach 12,000 rpm on HSK-T63 or Capto-C6. The Y-axis travel is ±80 mm (±3.1 in), generous for a turning machine, so milled features and off-centre bores can sit well away from the centreline. Total tool capacity is listed as 56 / 111 tools, well beyond the turret stations alone; confirm which capacity, and what holds the extra tools, in the quoted configuration. Tools may weigh up to 8 kg (18 lb), measure up to 125 mm (4.9 in) in diameter and reach 400 mm (15.7 in) in length.

Rapid traverse is 30 m/min (1,181 ipm) and the control is a Siemens S840D sl. The chuck size is given as 250 (315) without a unit, and the driven-tool power and torque rows list several figures without saying which tool interface each belongs to, so ask INDEX for the ratings that apply before planning heavy milling.