... adopts BTA internal chip removal type, the oil feeder supplies the cutting liquid to remove the chips out of the end of drill bar. When ... motor powerkw7.5 (2groups), 5.5(1 group)7.5 (2groups), 5.5(1 group)Cooling system rated pressureMPa2.52.5Cooling system ... (2groups), 5.5(1 group)7.5 (2groups), 5.5(1 group)7.5 (2groups), 5.5(1 group)Cooling system rated pressureMPa2 ...