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DTH IS SHORT FOR "DOWN-THE-HOLE"- Since the DTH method was originally developed to drill large-diameter holes downwards in surface-drilling applications.
- its name originated from the fact that the percussion mechanism followed the bit down into the hole.
- Applications were later found for the DTH method underground.
- The direction of drilling is generally upwards instead of down wards.
- DTHis short for "Down-The-Hole".
- In DTH drilling, the percussion mechanism commonly called the hammer is located directly behind the drill bit.
- The drill pipes transmit the necessary feed force and rotation to hammer and bit plus compressed air or fluids for the hammer and flushing of cuttings.
- The piston strikes the impact surface of the bit directly, while the hammer casing gives straight and stable guidance of the drill bit.
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