... (sandstore,shale and limestone. hole diameter:80mm Depth 3200mm Excavator Core Drilling Rig Main Technical Parameters:(Drill pipe length)3660mm (The type of ... )4m/min(Work wind pressure)1.0MPa(Work air volume)2.5m³/minFeatures:1,Tailored for open-air prospect hole and ... F below 8 degrees(such as sandstone,shale and limestone)2,Choose the pressure rising engine produced by British Richard joint ...