Haas SB-35Y

Haas's SB-35Y puts a Y axis and live tooling on the 12 in (305 mm) chuck, 3.5 in (90 mm) bar size of its box-way lathe series, in the shorter of two bed lengths. Z travel is 30.1 in (765 mm), maximum turning length 27.5 in (700 mm) and maximum turning diameter 12 in (305 mm). The spindle is a 40 hp (29.8 kW), 2,500 rpm unit on an A2-8 nose.

Two neighbours frame the choice. The SB-28Y has the same travel in X and Y and the same motor rating, but a 10 in (254 mm) chuck, 2.9 in (74 mm) of bar capacity, a 3.39 in (86 mm) spindle bore and 20.7 in (525 mm) of Z; in exchange its spindle reaches 3,200 rpm. The SB-35Y gives up that speed for a 4.13 in (105 mm) bore and a longer Z stroke. If the part is longer still, the SB-35LY carries the same spindle and Y axis over 49.8 in (1,265 mm) of Z.

The milling side is sized for secondary features, not for hogging. Y travel is ± 2 in (± 50 mm) with a 283 ipm (7.2 m/min) rapid and 4,490 lbf (19,972 N) of thrust, and the BMT65 live tools run to 4,000 rpm. X and Z each push 7,780 lbf (34,607 N), about 73% more than Y, and rapid at 472 ipm (12 m/min) and 787 ipm (20 m/min). The C axis offers interpolated motion and 0.01° positioning at up to 60 rpm; its 13.9 in (353 mm) brake holds 250 ft-lbf (339 N·m).

For turning, base torque is 425 ft-lbf (576 N·m) at 325 rpm. Haas also publishes 1,400 ft-lbf (1,898 N·m) at 150 rpm for an optional gearbox, which is the configuration to ask about if the work is large-diameter steel at low spindle speeds. The 2,500 rpm limit is the other side of that: on small-diameter bar it cannot reach the surface speeds carbide wants in aluminium or brass.

A tailstock with MT5 taper, 23.6 in (600 mm) of travel and a 4.7 in (120 mm) hydraulic quill is in the table, with 39.1 in (993 mm) between centres. The turret has 12 stations and takes OD and ID tools in any combination, with 2 in (51 mm) of rear clearance for boring bars. Shipping weight is 13,660 lb (6,196.2 kg) and Haas's starting price is US$161,995.