Job Description:

• 1) Operates self-propelled machine to install roof-support bolts in underground mine: Positions safety jack to support roof until bolts can be installed.

• 2) Drives machine into position, inserts bit in drill chuck, and starts drill.

• 3) Moves lever to advance bit into roof at specified distance from rib or adjacent bolt.

• 4) Removes bit from chuck and replaces with bolt.

• 5) Starts hydraulic action which forces bolt into hole.

• 6) Starts rotation of chuck to turn bolt and open expansion head to exert pressure upon rock formation.

• 7) Tests bolt for specified tension, using torque wrench.

• 8) May install truss bolts traversing entire ceiling span and tighten ends of anchored truss bolts, using turnbuckle.