INDEX G400

The INDEX G400 is a heavy turn-mill center with a 400 mm (15.7 in) chuck, 120 mm (4.7 in) bar capacity, a 3,000 rpm main spindle with 800 Nm continuous torque, and a turning length of 1,600 mm (63 in) or 2,300 mm (90.6 in) depending on the bed. It is built for long shafts and large-diameter parts.

The main drive is rated 34 kW continuous and 43 kW at 25% duty. Against the G300, which gives 525 Nm continuous at up to 4,000 rpm and 1,400 mm (55.1 in) of turning length, the G400 gives up top speed in exchange for more torque, a larger bar capacity and more length. That is the right trade for steel shafts and forged blanks, where low-speed torque sets the roughing rate.

Milling is done with either an HSK-T63 or a Capto-C6 tool interface, and the two are not equal. HSK-T63 runs to 12,000 rpm with 26 kW and 150 Nm; Capto-C6 runs to 18,000 rpm with 27.5 kW and 100 Nm. The first suits heavy milling and large drills, the second smaller cutters at higher speed. Tools may weigh up to 10 kg (22 lb), measure up to 160 mm (6.3 in) in diameter and reach 500 mm (19.7 in) in length, which allows long boring bars and deep-hole drills.

Tool capacity is listed as 12 tools on 12 turret stations, a short list for a machine of this size if jobs change often. Rapid traverse is 25 m/min, modest but consistent with the moving masses involved, and the control is a Siemens 840D sl.

Several other rows in the table (a 60 mm turning diameter, figures per spindle position) do not fit a single-spindle machine with a 400 mm chuck, so confirm swing and turning diameter with INDEX before quoting a part.