Mitsui Seiki J Series VMC's Thermal Sensors Maximize Accuracy
Source: Mitsui Seiki

Mitsui Seiki has launched a new series of CNC vertical machining centers named the “J” series for “jig,” suitable to machine medical, optical, mold and die, and aerospace parts.

The machines are said to provide positioning accuracy and repeatability of +/- 1 micrometer. A thermal compensation system employs sensors on the machine faceplate and inside the spindle to minimize the effects of temperature changes on part accuracy, and to cut temperature-generated displacement by as much as 60%. This system is also said to reduce Z-axis thermal growth and deflection by 30%. Cooling systems for slideway lubrication and ballscrew cores stabilize axis feed precision.

Mechanical design features that maximize machine rigidity and accuracy include hardened and ground tool steel box slideways as well as contact elements that enhance acceleration, reduce stick-slip and allow for feed accuracy of 0.1 micrometer, the company says. In addition, the design is said to improve the static rigidity of the Z-axis more than six times over conventional arrangements

These heavy-duty machines are designed to allow for complete machining of precision components including boring, milling, drilling and tapping. They feature the technology of a machining center with the precision of a jig borer, according to the company. 

The line includes four machines: PJ812, J1220, J1230 and J162. All machines feature a full enclosure and various coolant system options.​​​​​​​