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BTA Drilling Process

Explore Machines with BTA capabilities
BTA Drilling Process Machines

BTA stands for Boring and Trepanning Association which developed this deep hole drilling system. It involves a single drill tube in which high pressure coolant is supplied to the drill through the annular area between the drilled hole and the tube outer diameter. The chips are evacuated through the I.D. of the tube. The drill head is screwed to this drill tube which is much stronger compared to the kidney shaped shank of a gun drill, hence much higher metal removal rates are possible. This involves the use of a Pressure head which is basically a high pressure seal between the workpiece and the drill bush. BTA/STS drilling is generally used for ф19 and above.
Since the chip removal is internal, no v shaped groove is required in the shank, so its cross-section is completely round and this provides more rigidity to the entire system. BTA drilling finds its application in Industries like Oil & Gas, Defence, Steel, Aircraft, Aerospace, Hydraulic Cylinders, and Power etc. For larger diameter deep hole drilling, BTA drilling is the only available option which provides high productivity and precision.
Another system which evolved from BTA single tube system is the Ejector drilling system. It is a system with twin tubes where the coolant is pumped through the space between the inner and outer tube. This eliminates the use of Pressure head and simplifies the system. This was introduced mainly to tool up conventional machines to do Deep hole Drilling.

BTA Deep Hole Drilling Machine

BVN Series

BTA Drilling

Precihole’s BVN series BTA deep hole drilling machines are well designed and robust to take heavy loads while drilling large holes. This series covers hole drilling from Ø20 mm to Ø250 mm solid and counter boring to Ø400 mm. Work piece lengths of 500mm to 10m can be accomodated on these machines. These machines are configurable with features depending on accuracy requirements and type of parts to be drilled.

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Column Type Deep Hole Drilling Machine

PMTC Series

Column Type Drilling

This series is specifically designed for large mold bases and tube sheets. Machines can be configured for gun drilling mode or BTA mode as per requirements. This series can incorporate 3 to 7 axes of CNC depending on features selected.

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Deep Hole Drilling Special Purpose Machines

Special Purpose Machines

Multi Spindle Multi Axis

Precihole specializes in custom manufacturing deep hole drilling and hole finishes machines that are not covered in our standard series. With over 30 years of special machine design and development experience under its belt and a team of highly experienced concept and design engineers, Precihole prides itself to be one of the best SPM manufacturers in the industry.

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