Premium solid carbide twist drills are all done by 20 diameters, to maybe a bit more with hand tuned custom cycles. While we can use special g-code such as the Conversational Programming of G-Wizard Editor to extend the reach on deep holes beyond Parabolic Flute Drills and Peck Drilling, to go really deep takes even more specialized tooling. The depth to diameter ratio chooses the right process to produce straight deep holes… Here’s some quick information on various deep hole drilling solutions from our Deep Hole Drilling Guide: When used properly, gun drilling can produce straight holes that are much deeper than conventional style drills are capable of. “Deep Hole” is defined by drill diameters, and specifically the depth to diameter ratio. Gun Drilling & BTA Drilling: These are the right tools for the absolute deepest of Deep Hole Drilling.
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