BTA – System

The BTA-System is a deep hole drilling system for special deep hole drilling machines with an external coolant supply and an internal chip removal (single tube system). Necessary for supplying the coolant to the workpiece and for sealing off the process on the workpiece and boring bar, requires the BTA-System a pressure head (BOZA).

This system is used for borehole diameters between 7,76 mm and 700 mm and enables hole depths over 100 x D. As from dia. 18 mm the tools mainly become indexable cutting inserts and guide pads.

Gundrilling process

The characteristic of the single flute gundrilling process is that coolant is fed through the coolant hole in the tool and exits along with the chips in the V-shaped groove (flute) on the drill tube from the drilled hole. The coolant also provides lubrication to the drill periphery.

This is possible if coolant, i.e. deep-hole drilling oil or emulsion (min. 10 – 12% concentration, with additives), is provided in sufficient quantity and pressure.