Drilling with system ELB (Einlippenbohrer)
As a basis in all three systems we need a drilling bush, which at the beginning of drilling leads the drill as long as it needs for the drilling head to completely penetrate the material which is being worked. The cooling medium, which can be cutting oil or emulsion under high pressure, enters on the back side of the driving mechanism and passes by the spindle and through the drill onto the cutting part of the drilling head. Cuttings exit together with the cooling medium through the lateral groove of the drill and fall through the holder of drilling bush into the drain tap of chips.
Drilling with system BTA or STS (single tube system).
The characteristic of this system is that it is intended fro drilling holes of bigger dimensions from 20 mm up. The tool is composed of a tube that is fitted into the driving spindle, and crown drilling head that has hard-metal cutting plates that are brazed or screwed. The way of the cooling medium is reverse as at the ELB system. The cooling medium enters under pressure next to the tube onto the drilling head and onto the cutting plates, there it cools off the cuttings and then together with them passes through the tube, driving spindle and exits on the back side of the driving spindle and continues to the drain tap of chips.
Drilling with system EJEKTOR
This system is intended mostly for the construction of deep hole-drilling onto different processing centers that have hollow driving spindles. It is composed of a crown drilling head, two tubes which are inserted one in another and of an injector that serves as an inlet for the cooling medium. The cooling medium passes between the tubes onto the drilling head, where it takes over the cuttings, and returns through the inner tube and through the driving spindle into the drain tap of chips.