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A variant of this is the ejector drilling method in which the deep drilling oil is supplied through an annular chamber between the drill tube and an internal tube. The cooling lubricant exits at the side of the drilling head, flows around it and flows back with the chips in the internal tube.


A variant of this is the ejector drilling method in which the deep drilling oil is supplied through an annular chamber between the drill tube and an internal tube. The cooling lubricant exits at the side of the drilling head, flows around it and flows back with the chips in the internal tube.


A variant of this is the ejector drilling method in which the deep drilling oil is supplied through an annular chamber between the drill tube and an internal tube. The cooling lubricant exits at the side of the drilling head, flows around it and flows back with the chips in the internal tube./p>


A variant of this is the ejector drilling method in which the deep drilling oil is supplied through an annular chamber between the drill tube and an internal tube. The cooling lubricant exits at the side of the drilling head, flows around it and flows back with the chips in the internal tube.


A variant of this is the ejector drilling method in which the deep drilling oil is supplied through an annular chamber between the drill tube and an internal tube. The cooling lubricant exits at the side of the drilling head, flows around it and flows back with the chips in the internal tube.


A variant of this is the ejector drilling method in which the deep drilling oil is supplied through an annular chamber between the drill tube and an internal tube. The cooling lubricant exits at the side of the drilling head, flows around it and flows back with the chips in the internal tube.