Interchanges (Crossover Subs)
The Interchange is a 3 piece assembly consisting of an Interchange body, an inner tube, and a top sub. An Interchange is used in conjunction with an RC DTH hammer or Tricone Rock Bit. Its purpose is to direct the cuttings from the bit into the inner tube of the RC drill rod where they flow up the string and are discharged on surface. Jetted style interchanges bleed a controlled amount of compressed air into the return sample stream thus “jetting” the cuttings up the inner tube. The Interchange is positioned in the drill string directly above the DTH Hammer. Matrix interchanges are built tough and available in 1, 2, or 3 slot designs with or without “jetting” and are made to fit each Matrix RC tooling size.