The Mitsui Seiki PJ812 , which is designed to provide precision boring and contour machining, features the company’s MAMS (Mitsui Accurate Milling Support) thermal-monitoring system.

This ensures accuracy and repeatability are within ±1µm to suit workpieces typical of the optical, medical, aerospace and specialist mould-and-die sectors.

Mitsui Seiki’s product range is supplied and serviced in the UK by Hinckley-based 2D CNC Machinery Ltd (www.2dcnc.co.uk).

The PJ812 has a work envelope of 1,200 x 800 x 500mm, a 1,200 x 800mm table, a ‘planer-style’ symmetric construction designed to maximise rigidity, and hardened and ground tool-steel slideways that incorporate Mitsui Seiki’s latest ‘sliding mechanism’ development; this not only enhances axis acceleration and minimises stick-slip, it also allows the Z axis to have “some six-times greater static rigidity than more-conventional slideway designs”.

The machine’s thermal compensation reduces any influence of temperature fluctuations or temperature-generated displacement by 60%, thanks to the use of integrated sensors that are housed in the machine face plate and within the spindle.

Further gains in accuracy are made with the MAMS multi-sensor system on the Z axis, which reduces thermal growth and deflection by 30%.

Also contributing to overall accuracy is a cooling system for the slideway lubrication and the core of each ballscrew.

The PJ812’s direct-drive spindle options include a 50-taper 30kW 10,000rev/min unit and a 40-taper 18kW 30,000rev/min unit. The rapid traverse rates are 24m/min. Control is by Fanuc 31iM-B, and a 40 tool magazine is standard.