How to replace the impactor of a down-the-hole drill rig

How do you change a hammer drill bit?

If drilling is to be suspended temporarily, always pull up the hammer by at least two pipe lengths. Clean around the driver chuck before changing the drill bit. Make sure the shank of the new drill bit is clean. Keep the hammer clean and plug both ends when not in use. Change worn or damaged parts in good time.

How do you remove a hammer from a drill rig?

Lift out the backhead, weight of the backhead is around 7,4 kg (16.3 lbs) Remove driver chuck, drill bit and bit retaining ring. The chuck thread connection need to be loosened up either with breakout ta-ble on drill rig before the hammer is removed, or with a breakout bench.

What is a down the hole hammer?

One of the most commonly used tools in the drilling industry to meet such challenging scenarios is the Down the Hole Hammer (DTH hammer). DTH hammers are most used in hard rock formations and are designed to tackle complex tasks like drilling in populated areas without putting existing structures at risk.

What happens if a drill rig is not set-up correctly?

The rig must be set-up correctly in order to give stability and safety. If this is not done, the effects of feed force and rotation torque can cause the rig to move or even to over-turn. This could result in serious or fatal injury as well as damage to the drill rig and equipment.

What should I do if a drill hammer breaks?

Keep the threads and the insides of the pipes clean. Always cover the “open” thread end of the drill pipe during pipe- jointing operations. The ingress of dirt into the drill string will cause blockages and/or seizure in the hammer, which can result in breakdown.

How do I remove the backhead of a drill chuck?

Tighten the driver chuck with the aid of the bit wrench. Remove backhead. Backhead thread connection need to be loosened up with a breakout bench. Lift out the backhead, weight of the backhead is around 7,4 kg (16.3 lbs) Remove driver chuck, drill bit and bit retaining ring.