Mitsui Seiki has been a key player in the advancement of critical parts manufacturing capability in North America for over 55 years. Its product lines are renowned for their accuracy, contouring precision and long-term reliability.

The company has just launched the all-new PJ812 CNC vertical machining centre — the ‘J’ represents ‘Jig’, which is ideal to machine critical medical, optical, electric vehicle, mould and die, and aerospace parts.

The machine offers X, Y and Z travels of 1,200 x 800 x 500mm, a maximum work area of 1,200 x 800mm and the table can accommodate workpieces up to 1,500kg. It also provides positioning accuracy and repeatability of +/-1µm.

A thermal compensation system employs sensors on the machine faceplate and inside the spindle to minimise the effects of temperature changes on part accuracy and cut temperature-generated displacement by 60%. This system also reduces Z-axis thermal growth and deflection by 30%. Cooling systems for slide way lubrication and ball screw cores stabilise axis feed precision.

Mechanical design features that maximise 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 0.1µm. Another proprietary engineering detail significantly improves the static rigidity of the Z axis to more than six times that of conventional Z axis arrangements.

This ultra-precision machine allows for more complete machining of precision components including precision boring, milling, drilling and tapping — it offers machining centre technology and jig borer precision in one machine.

The machine also features a full enclosure and various coolant system options.