Wear studies in Boring Trepanning Association drilling

Boring Trepanning Association (BTA) drills are capable of machining holes having a large length-to-diameter ratio in a single pass. This is a unique self-piloted operation in which cutting and burnishing are both carried out at the same time. Wear studies on BTA drills reveal quite useful information regarding their life and performance. This paper deals with wear studies on 20 mm diameter BTA drills (solid boring) of the Heller design using En9 steel work samples. The studies include examination of the flank and crater wear on the cutting edge, circular land wear and the supporting pad wear. The variation in wear with respect to cutting time for different speeds and feeds is reported. © 1988.