EXPLORATION • DRILLING • FIELD SERVICES
BRAZED VERSUS INDEXABLE TOOLING
A deep dive into the benefits of Boring and Trepanning Association (BTA) drilling
Cartridge mounted insert BTA head D
eep hole drilling applications can be approached in several ways, but one of the most effective is often BTA
drilling. BTA stands for Boring and Trepanning Association, although it is sometimes referred to as STS or Single Tube System drilling. Unlike gun drills or twist drills a BTA drill features an internal chip removal, which has advantages in both productivity and hole quality. The BTA drill head has multiple
carbide cutting edges and guide pads mounted to it. Open spaces are designed into the head for chip removal, and chips are evacuated through the drill tube the head is
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www.engineerlive.com The BTA drill head has
multiple carbide cutting edges and guide pads mounted to it
threaded onto. Pressurised coolant surrounds the drill head in operation and is key to forcing chips through the head and out of the drill tube. This method of chip evacuation allows for a very clean and reliable process with excellent surface finish and high drill
feed rates – typically five to seven times faster than gundrilling at the same diameter. No peck cycles or feed interruptions are needed, resulting in reduced machine time while drilling extended depth-to-diameter ratios are even greater than 40:1.
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