Lightning Fast Turning Centers

Doosan Infracore America Machine Tools (Pine Brook, NJ) has expanded its range of Puma GT series Turning Centers with four new models: the Puma GT2600, GT2600M, GT2600L and GT2600LM. Distinguishing features include a ridged 30 deg single piece slant bed design, box guideways, a lightning fast non-lifting servo driven turret and EZ Guide i Conversational Programming System.

Standard chuck size is 10 in (optional 12 in available) with a maximum swing over bed of 24.8 in and swing over saddle of 18.1 in. Maximum turning length is 25.9 in on the standard Puma GT2600; 24 in for Puma GT2600M, while the long bed versions offer 42.4 in on the Puma GT2600L and 40.6 in on the Puma GT2600LM. The maximum bar working diameter is 3.2 in on all four models.

Box guideways are applied to all axes to increase dampening and rigidity, providing the ideal platform for taking deep, powerful cuts. The Puma GT’s 30 deg single-piece slant bed design reduces the center of gravity of both the spindle and cross slide by 12 percent, which minimizes thermal growth and improves operator ergonomics. Rapid travels: 945 ipm (X-axis) and 1,181 ipm (Z-axis).

The spindle design features three angular ball bearings in the front and cylindrical roller bearings in the rear, minimizing thermal growth and increasing precision. An optimized spindle overhang design has minimized the rotational inertial load, enhanced rigidity, and reduced accel/decel time. Spindle motor is 30 hp. Maximum spindle speed is 3,500 rpm. Maximum spindle torque 459 ft-lb.

Turret indexing times are lightning fast on the Puma GT2600, due to a servo driven non-lifting design, with a high torque motor. The new design is not only faster, it’s more reliable, with 53 percent fewer moving parts. Number of tool stations is 12; size, 1.0 in x 1.0 in; maximum boring bar size, 2.0 in for the Puma GT2600(L), 1.5 in for the Puma GT2600M(LM); turret indexing time, 0.15 sec.

Puma GT2600M and GT2600LM feature a BMT55P top plate which secures each tool with four bolts and keys to provide powerful machining performance with high efficiency, high rigidity, and a high precision internal drive system. A bevel drive gear and air /oil cooling deliver low heat generation, minimizes thermal growth, while providing silent vibration free performance. Rotary tool speed is 5,000 rpm with a 7.5 hp rotary tool motor.

The operating console features a Doosan-Fanuc i control with a large 10.4 in color TFT LCD monitor with USB port, PCMCIA Card, embedded Ethernet connectivity, full QWERTY keypad and several single-touch Hot Keys to simplify set-up and operation. For added convenience, the pendant is designed to swing 88 deg.

The EZ Guide i is included as a standard feature, offering shop floor conversational type programing. Roughing, finishing, castings, grooving, threading, peck drilling and more are all accomplished through EZ Guide’s menu driven functions. Programs are easily generated using cycles instead of long hand code.

Further, the new Puma GT2600 is easier to load. Distance from front cover to spindle center is reduced from 17.2 in to 15.3 in. And finally, for a machine with similar specifications, the new Puma GT2600 series are 14 to 25 percent more compact than the previous models.   Cost of floor space does impact the hourly operating cost and, in many cases, shop floor real estate has become an important issue.

The Puma GT2600 guarding has been designed to provide easy access for adjustment, maintenance and service. The chip conveyor design bolts directly to the machine allowing the chip pan and coolant tank to slide out independently. This design eliminates coolant leakage and makes it easy to access and clean the tank. The tail stock guide ways on the new Puma GT2600 series are covered and fully protected from chips. This eliminates the ongoing cleanup time required on previous models.

Energy savings is achieved by using a 23 percent more efficient hydraulic unit. An LED work light is now being used which lasts ten times longer than the previous halogen type and generates little heat. This helps to keep the work area a little cooler and thermally stable.  LED lights also consume much less energy. Auto power off functions further reduce power consumption and heat.

Doosan Infracore America Machine Tools, 19 Chapin Road, Pine Brook, NJ 07058, 973-618-2500, www.doosanmachinetoolsusa.com.