Atlas Copco AB
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Model ODEX/TUBEX -Overburden Drilling

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When drilling with ODEX/TUBEX the reamer wings are out and thus drill a hole that is larger than the casing outer diameter. When desired drilling depth is aquired, the reamer swings in (retracting position) when the drilling rod is rotated backwards. Thus the drill bit can be retracted through the remaining casing to the ground. Thereafter, DTH drillling can be conducted if desired.