The double tube system “DTS” or sometimes referred to as the “Ejector” system of drilling is where the coolant is supplied at the machine spindle through a special coolant inducer or connector.

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. Please submit your application to UNISIG to consider ejector drilling as a deep hole drilling process solution.

Our products include all of the components needed for every BTA and Ejector drilling application. Product offerings include drill bits of many different styles, indexable drill hardware and BTA and Ejector drilling accessories.

The DTS (Ejector) drill is a two tube drilling system requiring high pressure coolant which is forced between the tubes to evacuate chips. These drills are manufactured in diameters of 0.724”—2.559”. Drills are available in different grades and coatings to …

Ejector drilling is one of three major methods for deep hole drilling (defined by a ratio of depth to diameter that exceeds five), along with gun drilling and BTA/STS drilling.

Our deep hole drilling services encompass a wide range of capabilities, from ejector and solid drilling to trepanning, offering both on-center and off-center holes. We accommodate ID sizes ranging from .984” to 8.00” ID in lengths up to 415”.

The most productive way to create a deep hole is through the technique of deep hole drilling. Deep hole drilling is also known as BTA Drilling or Ejector Drilling.

Ejector Systems are a unique BTA deep-hole drilling process that utilize double tube systems. High-pressure coolant pumps through an outer tube; then into an inner tube for fast chip evacuation.

The Ejector-System is a variation of the BTA-System which is applied for conventional machine tools and machining centers. The coolant is introduced via an annular space between the boring bar and an inner tube (double tube system).

Ejector drilling is similar to BTA drilling but instead of a single tube it consists of two tubes. Coolant is fed from the outer tube and the chips and coolant after drilling are flushed from the inner tube. Precihole provides reliable, well designed machines for this process that are guaranteed to perform.