The Puma GT2100 8" and 10" turning centers from Doosan are based on the company’s Puma 240 machines, with compact footprints and improved accuracy and reliability. According to Doosan, the machines are 14 to 25 percent more compact than previous models.
The turning centers feature a 30-degree, single-piece slant-bed design said to reduce the center of gravity of both the spindle and cross-slide. Features such as wide ribs and a box-type slideway reinforce bed rigidity. The swing over the bed is 23.6", while the swing over the saddle is 15.4". Maximum turning diameter is 15.4", and maximum bar working diameter is 3.2". Maximum turning length is 22.1".
The 25-hp spindle provides speeds ranging to 4,500 rpm, and its overhang design minimizes the rotational inertial load. The spindle is equipped with three angular ball bearings in the front and cylindrical ball bearings in the rear. According to Doosan, this arrangement minimizes thermal growth and increases precision. Rapid traverse rates are 945 ipm in the X axis and 1,181 ipm in the Z axis.
The 12-station turret accommodates OD tool sizes ranging to 1.0 × 1.0" and maximum boring bar size ranging to 1.6". Indexing time is 0.3 sec., the company says. BMT55P turret tooling, available on the Puma GT 2100M, is fixed to the turret with four bolts and keys for high efficiency and rigidity. Rotary tool speed ranges to 5,000 rpm with a 7.5-hp rotary tool motor.
The Puma GT2100 turning centers feature energy-saving features such as an efficient hydraulic unit, LED worklight and automatic power-off functions. They also are equipped with a Doosan-FANUC i control and a 10.4" color TFT LCD monitor. Doosan EZ Guide i is included for conversational programing of roughing, finishing, castings, grooving, threading, peck drilling and more.
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