Haas ST-10Y Turning Center

The Haas ST-10Y is the short-bed Y-axis turning center of the ST-10 family: 16 in (406 mm) of Z travel, ± 2 in (± 51 mm) of Y, a 6.5 in (165 mm) chuck and BMT45 live tooling that runs to 4,000 rpm. Main spindle speed is 6,000 rpm from 15 hp (11.2 kW).

Compared with the two-axis ST-10, the Y version trades a little envelope for the milling axis: the ST-10 turns 12 in (305 mm) in diameter and rapids at 1,200 ipm (30.5 m/min) on both axes, while the ST-10Y turns 11 in (279 mm) and moves X and Y at 472 ipm (12 m/min). Travels in X and Z are unchanged at 7.88 in (200 mm) and 16 in (406 mm).

This is a machine for parts that would otherwise go from a lathe to a mill. The 12-station turret carries live tools; the C axis positions to 0.02° with interpolated motion, turns at up to 60 rpm and locks with a 9.5 in (241 mm) brake rated at 140 ft-lbf (190 N·m). Axis thrust is 2,400 lbf (10,676 N) in X, 2,300 lbf (10,231 N) in Y and 3,700 lbf (16,458 N) in Z. Those are light figures, in keeping with a spindle that makes 75 ft-lbf (102 N·m) at 1,300 rpm: think drilling, flats and small pockets, not heavy slotting.

The table carries a full set of sub-spindle figures, which is the other half of finishing a part in one cycle. It gives a 5.3 in (135 mm) chuck on an A2-5 nose, a 1.5 in (38.1 mm) bore, 6,000 rpm on its own and 4,800 rpm when synchronised with the main spindle for a part hand-off. The chuck throat is 1.3 in (33 mm) across and 1.37 in (34.8 mm) deep, and the brake holds 17 ft-lbf (23 N·m), so back-end milling has to be gentle. A tailstock with MT3 taper is listed as well. Confirm with Haas which of these your configuration includes.

Bar capacity is 1.75 in (44 mm) through a 1.81 in (46 mm) draw tube. Supply is 40 A at 220 VAC or 20 A at 440 VAC three-phase. Haas lists a starting price of US$102,995.