Modern Machine Shop
OKK USA Corporation has upgraded its VM vertical machining center line to include the VM-76R, which is designed for increased rigidity, accuracy and work area.
The VMC features a re-optimized rib shape/location and thicker 1-ton casting to increase rigidity. The Y-axis pitch has increased 3.14" to reduce deflection and improve accuracy. The machine is equipped with a No. 50 spindle taper for heavy-duty cutting and a larger tool capacity. An optimized ATC function adjusts ATC speed for heavy weight and large-diameter tools. Other features include a 12,000-rpm, 40-hp spindle motor with 309 foot-pounds of spindle torque and a 3.93"-diameter spindle inner bore diameter. For hard cutting material applications, an 8,000-rpm, gear driven spindle with 349 foot-pounds of spindle torque is available to attain high torque and horsepower at lower spindle rpm.
Servo upgrades increase feed thrust. To meet the high-precision demands of die mold applications, the VM-76R is equipped with double-anchored, core-chilled ballscrews and Soft Scale III to control thermal displacement.
The vertical machining center’s expanded worktable (61.02" × 29.92"), stroke (60.62" × 29.92") and enhanced head design help prevent collision between the workpiece and spindle head, the company says. While the work area has increased, the depth of the machine is only 3.15" larger than its predecessor, the VM7III.
The machine’s FANUC F3Ii and Mitsubishi Neo730 controllers feature a larger display panel to increase ease of use. Other operator-friendly improvements include a wider step inside the machine, the addition of a folding outside step and LED lights, the company says.
The VM-76R is capable of machining a range of materials, including Inconel and titanium.