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Jig Milling/Boring Accuracy with Machining Center Productivity

Mitsui Seiki offers the PJ812 VMC. The "J" represents "Jig," which is suited to machine critical medical, optical, electric vehicle, mold and die and aerospace parts.

The PJ812 offers XYZ travels off 1,200 mm, 800 mm and 500 mm. Maximum work size is 1,200 mm x 800 mm x 450 mm. Table load accommodates 1,500 kg. The VMC provides positioning accuracy and repeatability of +/- 1 µm. 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%. This system also reduces Z-axis thermal growth and deflection by 30%. Cooling systems for slide way lubrication and ball screw 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 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," said a company spokesperson.

This ultra-precision machine allows for more complete machining of precision components including precision boring, milling, drilling and tapping. The machine features a full enclosure and various coolant system options.

For more information contact:

Mitsui Seiki USA Inc.

563 Commerce Street

Franklin Lakes, NJ 07417


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