Fundamentals18 min read
The Four Deep Hole Drilling Methods Explained: Gun Drilling, BTA, Ejector, and Trepanning
A comprehensive technical guide to the four primary deep hole drilling methods — gun drilling, BTA (single-tube), ejector (double-tube), and trepanning. Detailed process mechanics, specifications, applications, and a selection decision matrix with cost data.
gun drillingBTA drillingejector drilling