Ejector Drilling

Ejector drilling is a limited alternative to BTA deep hole drilling, using a dual tube system, and both internal and external coolant. High pressure coolant is introduced between the inner and outer drill tubes, and exhausted through an adapter mounted to the front of the machining spindle. Ejector drilling is typically used to retrofit lathes and machining centers, but is limited in efficiency, depth-to-diameter drilling ratios, and chip and fluid removal.