Drill: drill small artifacts, small workpiece must be clamped to prevent aircraft. Large workpieces in drill stand drill when drilling, to put a fixed PIN or screw in the drill. To prevent the workpiece from being bit into security incidents. 

When processing large hole on the radial drilling machine, workpiece must use code Fe code Dr. Mold disassembly process, cannot be directly tapped the mold surface with iron bars, with the Horn or the copper hammer strokes, in case of surface deformation