Haas SB-28

The Haas SB-28 is the 10 in (254 mm) chuck model in Haas's box-way lathe series, with 2.9 in (74 mm) of bar capacity, 21.3 in (540 mm) of turning length and a 40 hp (29.8 kW) spindle that runs to 3,200 rpm. Swing is 23.6 in (600 mm) and the largest diameter the turret can turn is 13.5 in (345 mm).

What stands out is how much spindle sits behind a short bed. The motor rating and the torque, 425 ft-lbf (576 N·m) at 325 rpm, are identical to the SB-35, which carries a 12 in (305 mm) chuck and 3.5 in (90 mm) of bar capacity. The SB-28 trades bore for speed: its 3,200 rpm ceiling is 28% above the SB-35's 2,500 rpm, which helps surface speed on the smaller diameters a 2.9 in bar implies.

Z travel is 23.2 in (590 mm) and X travel 9 in (230 mm), with rapids of 787 ipm (20 m/min) and 630 ipm (16 m/min). Both axes are rated for 7,780 lbf (34,607 N) of thrust, which is a lot of push for drilling large holes from the turret. Parts longer than the 21.3 in turning length belong on the SB-35, at 30 in (760 mm), or the SB-35L, at 49.6 in (1,260 mm).

The table lists a 12-station turret that takes OD and ID tools in any combination, BMT65 live tooling at 4,000 rpm and a C axis described as interpolated motion and positioning: 60 rpm, 0.01° positioning and a 13.9 in (353 mm) brake holding 250 ft-lbf (339 N·m). There is no Y axis on this model, so milling stays on or through the centreline; the SB-28Y is the version with ± 2 in (± 50 mm) of Y. A tailstock with MT5 taper, 19.7 in (500 mm) of travel and a 4.7 in (120 mm) hydraulic quill is also in the table.

Coolant capacity is 40 gal (151 L). The machine ships at 12,600 lb (5,715.4 kg) on a 172 × 90 × 81 in (437 × 229 × 206 cm) pallet, and it needs 70 A at 220 VAC or 35 A at 440 VAC three-phase. Haas lists a starting price of US$94,995.