Hurco TM12i

The Hurco TM12i is the heavy end of Hurco's TM turning centers: a 315 mm (12.4 in) chuck, 104 mm (4.09 in) bar capacity and a 2,800 rpm spindle rated 55 kW (73.76 hp) and 604.9 Nm (446.17 ft-lb). It turns parts up to 510 mm (20.08 in) in diameter and 1,000 mm (39.37 in) long, on 305 mm (12 in) of X and 1,016 mm (40 in) of Z.

Power is the headline. 55 kW (73.76 hp) is two and a half times the 22 kW (29.5 hp) of the TM10i, and torque rises to 604.9 Nm from 350.8 Nm (258.78 ft-lb) on the TM10i. That is what deep roughing passes on large steel diameters, heavy grooving and big-bore work draw on. The 2,800 rpm ceiling means small diameters will not reach full surface speed, but a 315 mm chuck is not chosen for small parts.

Length matters as much as diameter here. With 1,006 mm (39.6 in) between centers and a 1,000 mm (39.37 in) turning length, shafts, rolls and long tubes fit in one setup, and the 104 mm (4.09 in) bore lets long bar or tube pass through. Swing over the bed is 680 mm (26.77 in), and swing over the cross slide matches the 510 mm (20.08 in) maximum turning diameter.

The TM12Mi is the live-tool sibling, with driven tools at 4,000 rpm and 743.7 Nm (548.56 ft-lb) from 40 kW (53.64 hp), but a 360 mm (14.17 in) turning diameter. The TM12i keeps the full 510 mm and the higher power for turning-only work. Its 12-station turret takes 25 mm x 25 mm shanks and boring bars up to 40 mm (1.57 in), both axes rapid at 30 m/min (1,181 ipm), and the machine weighs 7,500 kg (16,535 lb). Programming is on Hurco's WinMax, conversationally or in NC code.