How much hold back should be increased in DTH drilling?

Hold back should be increased more and more as additional rods are added and as drilling progresses. DTH drilling is primarily percussive drilling using the energy imparted by the hammer piston to the rock through the bit. Any attempts to apply too much weight could damage the bit, hammer and drill string and impair the drilling rate.

What is a down the hole drill?

A “down the hole” (DTH) drill is a piece of drilling equipment used in mining, construction, and exploration activities. It is specifically designed for drilling large-diameter holes in hard rock formations.

How do you use a DTH drill?

Thrust should be kept as low as possible at all times to avoid excessive vibration in the drill string. Hold back should be increased more and more as additional rods are added and as drilling progresses. DTH drilling is primarily percussive drilling using the energy imparted by the hammer piston to the rock through the bit.

What is a blasthole rig & Drill?

Blasthole rigs and drills don’t need much explanation. They’re used for drilling a hole into the surface of the rock, packing the hole with explosives and then detonating those explosives in the blasthole to break up rock and hard minerals to make it easier to remove.

How do you lubricate a rock drill rig?

Blow the hammer clear of all water. If at all possible, the backhead and chuck should be broken loose on the drill rig, this is much easier than trying to do so in the shop. Disassemble the hammer. Inspect and wipe all the parts clean. Lubricate all the internal parts with rock drill oil.

How do you lubricate a hammer rig?

Grease all threads and splines when assembling drill bit into the hammer. Never try to use a drill bit which is larger in diameter than a partially drilled hole. Ensure hammer lubricator is working. Pour 1/2 pint (0.30 litres) of air line oil into the hammer. When attached to drill rig, blow air through to ensure all internal parts are lubricated.