A DTH (down-the-hole) drill is basically a mini jackhammer attached on the bottom of a drill string. It is one of the fastest ways to drill hard rock. It is rotary with percussive type drilling. The direction of drilling is usually upwards instead of downwards. It can drill up to 500 feet or 150 meters per day. In DTH drilling, the percussion mechanism generally called the hammer mechanism. Hammer is located directly behind the drill bit. It is commonly used for drilling ... Read more
