Hurco TM8i

The Hurco TM8i is a 2-axis turning center with a 210 mm (8.27 in) chuck, 64.5 mm (2.54 in) bar capacity and a 4,000 rpm spindle rated 23.2 kW (31.11 hp) and 221.5 Nm (163.41 ft-lb). Its envelope covers parts up to 356 mm (14.01 in) in diameter and 525 mm (20.67 in) long, with 203 mm (7.99 in) of X and 550 mm (21.65 in) of Z.

Within the TM8 group the plain TM8i is the turning-only machine with the largest diameter. The TM8Mi adds driven tools at 5,000 rpm but turns only to 256 mm (10.08 in), and the TM8MYi adds a 55 mm (2.17 in) Y axis with a 320 mm (12.6 in) maximum turning diameter. If parts are finished complete on a mill afterwards anyway, or have no cross-drilled or milled features, the TM8i gives the most room for the diameter.

The step from the TM6i is about capacity rather than speed. Bar capacity rises from the TM6i's 45 mm to 64.5 mm (2.54 in), torque roughly doubles from 113.9 Nm (83.99 ft-lb) on the TM6i, and turning length grows to 525 mm. Top speed drops to 4,000 rpm, which still gives good surface speed on the mid-range diameters this chuck is made for.

The 12-station turret takes 25 mm x 25 mm square shanks and boring bars up to 40 mm (1.57 in). Swing over the bed is 525 mm (20.67 in) and over the cross slide 300 mm (11.81 in), with 597 mm (23.5 in) between centers. X and Z rapid at 30 m/min (1,181 ipm). At 4,030 kg (8,885 lb) the machine is a moderate rigging job. It runs Hurco's WinMax control, so turned parts can be programmed conversationally at the machine as well as in NC code.