New VMC with jig milling accuracy from Mitsui Seiki

​Mitsui Seiki has been instrumental in the advancement of critical parts manufacturing capability in North America for over 55 years. Today its product lines represent the utmost in accuracy, contouring precision, and long-term reliability.

To that end, the company has launched the “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.

Mitsui Seiki machines are distributed in the UK by Kyal Machine Tools in Market Harborough.

The PJ812 offers travels X-1200mm, Y-800mm, Z-500mm. Max work size is 1200mm x 800mm. Table load accommodates 1500kg. The VMC provides positioning accuracy and repeatability of +/- 1µm.

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 cut temperature-generated displacement by 60 percent.

This system also reduces Z-axis thermal growth and deflection by 30 percent. Cooling systems for slide way lubrication and ball screw cores stabilize 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 0.1 µm.

Another proprietary engineering detail drastically 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. Machining centre technology and jig borer precision in one machine.

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