Mitsui Seiki USA Inc. announces a new series of large, highly accurate CNC jig mills for producing mold bases, mold plates, precision hot runners, progressive and transfer dies, and other jig boring and milling applications. The fixed cross-rail, massive ram design of the J1620 and J1620X machines provides a straightness accuracy in X and Y axes better than 10 microns, according to the company. Further, table squareness to the Z-axis is also better than 10 microns.

"The accuracy of these machines is really unparalleled," said Thomas Dolan, vice president. "Our design offers significantly tighter control in boring operations than conventional moving/sliding cross-rail configurations."

Working size range is for the J1620 is 2,100mm (X) x 1,600mm (Y) x 500mm (Z). Table size is 2,400mm x 1600mm with a load capacity of 4,000kg. With the J1620X version, all the specifications are the same except X-axis is 2,500mm and the table is 2,200mm x 1,500mm. A variety of CNC U-axis boring heads are available on both models. The machines feature a 10,000-rpm built-in integral spindle with a 50-taper interface. The spindle technology controls growth and provides thermal stability. Customers can choose from a variety of toolchanger units with capacities from 10 to 180 tools and more. Likewise a variety of coolant and chip evacuation systems can be chosen to match the customer's needs. Ultraprecise probing is also an option as an aid to workpiece setup and in-machine inspection functions. The popular FANUC 30i-B control combines user-friendliness and exceptional levels of accuracy, reliability and efficiency. Machine enclosure and guarding options on the jig mills meet current environmental, health and safety standards.