• CNC Servicing & Solutions India Private Limited (Haas Automation)

Turning Centre, Large Through-Bore

Haas Automation Inc has launched the ST-55, a heavy-duty, large-bore Turning Centre that is extremely rigid, highly accurate, and very thermally stable. The machine’s twin-chuck capability, high-torque spindle, and 12.5" (318 mm) diameter through-bore make it ideal for machining heavy pipes and fittings, large couplers, and long rollers. It has a maximum cutting capacity of 25.5" x 80" (648 x 2032 mm), with swings of 34.5" (876 mm) over the front apron and 25.5" (648 mm) over the cross slide. A servo-driven tailstock (MT6 taper) is standard, and a steady rest provision is available for additional support of long shafts. A 55 hp (41 kW) vector dual-drive unit powers the ST-55’s spindle through a Haas-built two-speed gearbox to provide 4250 ft-lb (5762 Nm) of torque in low gear. High gear provides a maximum spindle speed of 1000 rpm. Both front and rear A1-20 spindle noses accept a variety of aftermarket large-diameter manual and pneumatic chucks. The ST-55 comes equipped with a massive hydraulically clamped 12-station bolt-on style tool turret that accepts 7.25" (184 mm) split boring bar holders, as well as standard BOT toolholders. Standard equipment includes rigid tapping, a color remote jog handle, a 15" colour LCD monitor, and built-in USB connectivity. Available high-productivity options include a belt-type chip conveyor, high-pressure coolant systems, and much more. To tackle the types of jobs common in oilfield work, the ST-55 is available with Haas Automation’s proprietary Intuitive Programming System, which includes powerful built-in threading and rethreading cycles for both straight and tapered threads – something found on no other machine. The ST-55 features a heavy sheet metal enclosure that provides complete protection from chips and coolant during machining. A pair of wide sliding doors provides unobstructed access to the front chuck and main work area, both from the front and the top, allowing easy overhead loading.