Specific skills are required to achieve the Performance Criteria of this unit, particularly for its application in the various circumstances in which this unit may be used. This includes the ability to carry out the following, as required to conduct down-hole hammer drilling: apply legislative, organisation and site requirements and procedures for conducting down-hole hammer drilling identify various thread types on the equipment at site and the application of prescribed torque identify worn drill pipe and damaged threads identify and measure various bits in use correctly use the various rod/pipe handling equipment on site correctly and competently add/remove rods/pipe from the string correctly apply rotation speed and weight on the bit to maintain optimum performance correctly measure line string components and calculate hole depth utilise the correct combination of air volume and pressure to maintain productivity and sample integrity collar holes ensure that samples are correctly collected and handled ensure that all string components are correctly maintained correctly measure bits and related components to ensure compatibility ensure that bit sharpening equipment, used to sharpen TC bits are used correctly and safely and that bits are sharpened to correct tolerances correctly select various bit types for differing ground conditions disassemble describing the function of components, inspect components, replace unserviceable parts and reassemble a DTH hammer use prescribed techniques to safely clear sample delivery hose blockages monitor sample quality and correctly interpret changes accept responsibility for the correct installation and maintenance of restraining devices to pressure and sample delivery hoses communicate the hazards of cuttings in the return air stream to all crew members ensure that drill pipe is inspected regularly and wear rates monitored ensure that threads are inspected and maintained as required |