BTA drilling vs gun drilling · 5 min read
Compare BTA and gun drilling by diameter tendency, coolant and chip path, straightness considerations and when honing follows.
Published: · By Gökhan D., Founder & Managing Director, CNC Turkey
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Send bore diameter and length, material, permitted drift, final size and surface requirement with the drawing.
No account needed · or email: info@cnc-turkey.com
Gun drilling is generally used for smaller deep holes, while BTA is used for larger diameters and higher chip volumes. Diameter alone does not decide the process; length-to-diameter ratio, material, straightness, entry condition and required surface must be reviewed together.
In gun drilling, coolant travels through the tool to the cutting edge and chips return along an external V-flute. In BTA/STS, coolant is pumped around the drill tube to the cut; chips and fluid return through the tube. The internal return path suits larger chip volumes.
Both methods can make long holes, but neither makes a perfectly self-correcting bore. Entry face, guidance, tool condition, material uniformity and length-to-diameter ratio affect drift. The permitted axis deviation and inspection method should be stated on the drawing.
Deep-hole drilling creates the bore. When final diameter, cylindricity or surface requirements are tighter than the drilled result, controlled stock is left and honing follows. At CNC Turkey the bore is drilled with the standard BTA tool closest to the final size within Ø30–110 mm, and honing brings it to final size.
Our deep-hole capacity is BTA Ø30–110 mm, up to 4000 mm in one pass. Small-diameter gun drilling below Ø30 mm is outside our range. We state that boundary so drawings are screened for the right process.
FAQ
No. Coolant and chip paths differ, as does the diameter range each process generally suits.
Gun drilling generally suits smaller diameters and BTA larger diameters. The exact choice depends on geometry and specification.
No. We offer BTA Ø30–110 mm only; below Ø30 mm is outside our range.
Yes. Suitable stock is planned for final size and surface. Our honing capacity is up to Ø300 × 2000 mm.
RFQ
Start with quantity, material, quality requirements and delivery country.
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