• Operate controls to stabilize machines and to position and align drills.
• Start, stop, and control drilling speed of machines and insertion of casings into holes.
• Regulate air pressure, rotary speed, and downward pressure, according to the type of rock or concrete being drilled.
• Select and attach drill bits and drill rods, adding more rods as hole depths increase, and changing drill bits as needed.
• Drive or guide truck-mounted equipment into position, level and stabilize rigs, and extend telescoping derricks.
• Operate machines to flush earth cuttings or to blow dust from holes.
• Verify depths and alignments of boring positions.
• Perform routine maintenance and upgrade work on machines and equipment, such as replacing parts, building up drill bits, and lubricating machinery.