2/2/2017 | 1 MINUTE READ

PJ812 Three-Axis CNC Vertical Jig Mill for Contour Machining

Originally titled 'Three-Axis CNC Vertical Jig Mill for Contour Machining'
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The machining center provides positioning accuracy and repeatability of ± 1 micron.

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The Mitsui Seiki PJ812 Precision Profile Center is a three-axis CNC vertical jig mill engineered to perform high-precision contour machining and ultra-precise boring of components with critical tolerances. It is especially useful for processing parts for the mold and die, optical, aerospace and medical industries.

The machining center provides positioning accuracy and repeatability of ± 1 micron. 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 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 micron. Another engineering detail improves the static rigidity of the Z-axis to more than six times that of conventional Z-axis arrangements.

The PJ812 machining center spindle choices up to 30,000 rpm are all 50 taper, with 30- and 15-kW (40- and 20-hp) direct drive motors. X-, Y- and Z-axis travels are 1,200 mm (48"), 800 mm (32"), and 500 mm (20"), respectively. The machine table can accommodate a maximum load of 1,500 kg (3,300 lbs) on its 1,200 mm (48") × 800 mm (32") work surface. The overall machine footprint is 4,720 mm (189") by 3,000 mm (120"). A 40-tool capacity ATC is standard.

The fully enclosed machine allows for complete containment of chips and coolant.

The machining center possesses an energy saving circuit that reduces electric power consumption by as much as 90 percent and compressed air consumption by as much as 40 percent. 

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