Five-Axis Machining Center Processes Smaller Workpieces

Mitsui Seiki’s new PJ 303X five-axis machining center is reportedly capable of processing workpieces up to 230 mm tall, 280 mm in diameter (9" x 11") and 20 kg (44 lbs) in weight. According to the company, typical applications include lens molds, medical products, EDM electrodes and fuel cell components.

The machine’s X-, Y- and Z-axis travels are 300 mm, 325 mm and 200 mm (11.8", 12.8", 7.9") respectively. A-axis rotation is +40˚ to -100˚, and the C-axis rotates a full 360˚. High-speed linear motors move the X, Y and Z axes, while the rotary axes employ direct-drive motors. Rapid traverse speed for the X, Y and Z axes is 20 m/min (66 ft/min).

Mitsui Seiki says a 50,000-rpm, HSK-E25 taper spindle offers high-speed machining capability, and its automatic tool changer is engineered to store up to 24 tools as large as 40 mm (1.57") in diameter and 120 mm (4.7") in length. To maximize precision, the sliding machine surfaces of the PJ 303X are hand-scraped.

On the machine, advanced spindle thermal displacement technology is standard, including a symmetrical gantry column structure that accommodates thermal deformation fluctuations and a thermal compensation mechanism for the machine spindle/head.

Operator-friendly features include a 380 mm (15") color display with touch panel capability that can be moved to the most convenient position relative to the work envelope. The machine’s double-stage rotary door provides wide access for visibility and setup.

According to the company, the PJ 303X takes up a compact 1,755 mm width (5.75') x 2,370 mm length (7.77') x 2,655 height (8.7') floor space, and weighs approximately 4,500 kg (9,900 lbs).