DN Solutions PUMA TL 2500 XL

The DN Solutions PUMA TL 2500 XL is the longest turning-only model in this group of DN twin-turret lathes: 1,300 mm (51 in) of Z travel and a 1,250 mm (49 in) maximum turning length behind a 10-inch chuck. Its spindle is rated 26 kW (35 hp) and 433 N·m (319 ft-lb) at up to 4,000 rpm.

Start with the building rather than the part. The machine is 4,510 mm long, 2,630 mm wide and 2,115 mm high (178 × 104 × 83 in) and weighs 9,600 kg (21,164 lb). The PUMA TL 2500 L, one bed length down with 1,050 mm (41 in) of Z travel, weighs 8,500 kg (18,739 lb). Check the delivery route, the crane or forklift capacity and the floor before anything else, and remember that a shaft of full length also has to be loaded and unloaded at the spindle end.

What the extra length buys is the ability to turn shafts in one piece that the shorter beds cannot hold. At this length a part is slender for most of its travel, and that is where a lower turret pays for itself: with one tool above and one below, the radial forces oppose each other and the shaft is pushed off line far less than by a single tool. DN describes the series as optimized for shafts turned simultaneously by the upper and lower turrets and lists a programmable tailstock for longer components.

The diameter row needs a question to DN. For this model it reads 370 / 240 mm, two values with no label, whereas the PUMA TL 2500 L table gives a single 370 mm (15 in). Find out which figure applies along the full turning length before planning a part larger than 240 mm.

No live-tool speed is listed. X travel is 250 mm (10 in), and rapid traverse is 20 m/min (787 ipm) in X and 24 m/min (945 ipm) in Z, so on a stroke this long the Z return moves are worth including in cycle estimates.