deep hole boring machine,good quality This machine is specialized in deep hole drilling purpose with properties of high efficiency, high ... and aeronautics..specificationTechnical dataDrilling holes diameter rangeΦ3-30mmMax deep hole depth2500mm,2000mm,1500mm,1000mm,600mmDrilling box spindle speed(stepless) ... system working pressure6.3MPaMax pressure of the carriage68KN deep hole boring machine