... projects e.g. prospecting, railway, road, port, bridge, water conservancy and hydropower, tunnel, well, industrial and civil construction, ... suitable rotary speed to meet various needs.2) Common auto parts, such as clutch, transmission case and shifting structure ... . Technological Data of Drilling Rigs: ModelHGY-300 Water Well Drilling MachineDrilling depth( m)300Drilling rod diameter.(mm ...