According to Mitsui Seiki USA, one of the leading builders of jig borers, the market demand for these ultra-precise machines is on the rise.

“Jig borers typically last 25 to 30 years,” says Mitsui Seiki USA’s Bill Malanche, COO. “Now seems to be the time that people are retiring their legacy machines and looking to buy new.”

Mitsui Seiki’s newest line, the J12/J/16 jig borer series, combines large capacity and high precision to meet the increasing need for accuracy for machining workpieces such as molds and castings. The machines offer Y-axis stroke of either 1250mm or 1600mm, with standard table sizes of 2400mm x 1250mm or 2900mm x 1600mm.

The machines’ strong and durable structures provide table lateral movement accuracy of 2.5µm or better. The Z-axis guide system is restrained on four sides to maximize rigidity and reliability, and dual ball screws ensure stable feed motion.

For precision hole-making applications, XY interpolation enables the J12/J16 machines to carry out high-precision contouring by utilizing an end mill instead of a boring tool, eliminating the need to manually adjust a boring tool to accurately finish the hole diameter avoiding bottlenecks. Pitch accuracy is within 5µm even for large-pitch holes.

The machines feature a 12000rpm 50 taper spindle and automatic toolchange capacity of 60 tools. Additional options such as quill spindle, increased work capacity, as well as automation features are available to meet the customers’ needs.

“Machines in Mitsui Seiki’s J12/J/16 jig borer series are engineered to process a large range of part sizes with unceasing repeatability,” says Malanche. “They provide the durability, accuracy and flexibility required in today’s highly-competitive manufacturing environment.”