The Johnford GMC series is a combination of speed, rigidity and precision heavy duty gantry type machining center. The machine design features a moving bridge on two platforms and fixed table for unlimited table loads. The main structures of machine are constructed with Meehanite cast iron.
Starting at 3 meters of X travel, the GMC series can be expanded up to 20 meters of X travel. This machine can also be equipped with linear motors or preloaded rack & pinion drives to expand the distance of what you want in X travel. The CNC synchronizes the servo motors to eliminate the crabbing effect. Twin Heidenhain glass scales are standard on the X axis to enhance positioning accuracy.
There are two types of bridges. One is a Box-in-Box bridge, and the other is rugged bridge with offset Y-axis ways. The lightweight box-in-box bridge supports the headstock with two additional rugged I-beams. But the rugged bridge with offset Y-axis ways and the traveling head have been designed with diagonally arranged ribs that will help reduce the amount of distortion that is caused by years of continued service. Similarly, all types of bridges can be equipped with linear scales for Y-axis moving precision.