Visitors to IMTS 2026 can see it in action September 14-19 in Booth 338700 South Hall at McCormick Place (Chicago, Illinois). Typical applications cover an extensive range of critical parts such as lens molds, medical products, EDM electrodes and fuel cell components.

[Franklin Lakes, NJ - June 2026] The PJ 303X 5-axis Ultra High Precision Vertical Machining Center equipped with automation provides maximum precision and versatility in processing of workpieces up to 230mm tall and 280mm in diameter (9" x 11"), and 20 kg (44 lbs.) in weight. Visitors to IMTS 2026 can see it in action September 14-19 in Booth 338700 South Hall at McCormick Place (Chicago, Illinois). Typical applications cover an extensive range of critical parts such as lens molds, medical products, EDM electrodes and fuel cell components.

While many in the industry may think of Mitsui Seiki machines for heavy duty machining of large, critical components, the PJ303X is designed to accurately machine smaller parts, offering a positioning accuracy and repeatability of ±0.001 mm. High-speed linear motor drives move the X-, Y-, and Z-axis 300 mm, 325 mm, and 200 mm (11.8", 12.8", 7.9") respectively. Rapid traverse speed is 20 m/minute (66 ft/min). In applications where tight tolerances and complex geometries demand extremely high precision machining capabilities, the ability to feed material slowly (near to 0.1 mm/min.) on the linear axes allows operators to machine delicate features and perform finishing processes precisely. Additionally, the PJ 303X provides fine control of rotary-axis speeds at the low end for smooth 5-axis interpolation on critical features, improving surface finish and dimensional accuracy. An absolute glass scale feedback system offers full and accurate closed loop control by determining the exact axis location for each job without the need for additional programming after each power-up, delivering unparalleled accuracy and repeatability every time.

A 50,000-rpm, HSK-E25 taper spindle offers high-speed machining capability. 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 further enhance precision, including a 15" color display with touch panel capability than can be moved to the most convenient position relative to the work envelope. The control is the new Fanuc F31i-B5 with the i-H Pro control panel. The machine's double-stage rotary door provides wide access for visibility and setup.

An automatic tool changer engineered to store up to 24 tools as large as 40mm (1.57") in diameter and 100mm (3.9") in length provides tooling versatility.

"The PJ303X was engineered to bridge ultra-precision machining with modern automation strategies. For medical, optical, and advanced technology manufacturers, it provides a scalable platform that delivers uncompromising accuracy, process stability, and production efficiency while meeting the industry's most demanding quality requirements," said Yasuhide Akimoto, Executive Vice President, Mitsui Seiki.

For more information, be sure to visit Mitsui Seiki USA in Booth 338700 South Hall at IMTS 2026 or visit www.mitsuiseiki.com.
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About Mitsui Seiki

Mitsui Seiki offers a comprehensive lineup of metal cutting machines extending from jig boring machines and grinders to horizontal and vertical machining centers and 5-axis machining centers that support the world's leading industries. Mitsui Seiki USA combines engineering, sales support, service, and spare parts responsibilities with a strong sales and support network covering North America.