Featured at IMTS 2014: Through-bore Turning Center

The ST-55 from Haas Automation is a heavy-duty, large-bore turning center. The machine’s twin-chuck capability, high-torque spindle, and 12.5-in.-diameter through-bore make it suitable for machining heavy pipes and fittings, large couplers, and long rollers.

It has a maximum cutting capacity of 25.5 by 80 in., with swings of 34.5 in. over the front apron and 25.5 in. over the cross slide. A servo-driven tailstock (MT5 taper) is standard, and a steady-rest provision is available for additional support of long shafts.

A 55-HP, vector dual-drive unit powers the machine’s spindle through a two-speed gearbox to provide 2,100 ft.-lbs. of torque in low gear. High gear provides a maximum spindle speed of 1,000 RPM. Both front and rear A1-20 spindle noses accept a variety of aftermarket large-diameter manual and pneumatic chucks.

This machine comes equipped with a hydraulically clamped, 12-station, bolt-on-style tool turret that accepts 7.25-in. split boring bar holders, as well as standard BOT toolholders. An optional hybrid BOT/VDI turret is available.

Standard equipment includes rigid tapping, color remote jog handle, 15- in. color LCD, and built-in USB connectivity. Available options include a belt-type chip conveyor, high-torque live tooling with C axis, and high pressure coolant system.

www.haascnc.com