The Hi-Net DMC-1600HN by Johnford is suited for manufacturers demanding speed, rigidity and precision in a double-column machining center. Absolute Machine Tools offers this 45,000-lb bridge mill, which is engineered for high speed, net-shape machining of complex 3D parts such as those found in the mold/die and aerospace industries.
The center accommodates a variety of materials at high feed rates and with a high degree of accuracy, the company says, adding that the Meehanite castings provide strength and vibration dampening for quality surface finishes and long cutting tool life. The columns and bridge are a one-piece casting to add rigidity. A Z-axis head and Y-axis saddle feature square box ways and diagonally arranged ribs to minimize distortion.
To further add to rigidity, the machining center features a moving table/fixed-column design as well as a 90-degree bridge with offset Y-axis ways and a wide saddle to keep the spindle center line close to the bridge. X-axis table traverse is accomplished via Schneeberger roller linear ways for accurate positioning of heavy workpieces. Large-diameter, pretensioned ballscrews are directly coupled to the servomotor. The bridge mill has XYZ axis travels of 63" × 51" × 32" and rapid traverse rates of 590 ipm in the X and Y axes and 472 ipm in the Z axis. It can accommodate table loads as heavy as 13,200 lbs.