Gun drilling is a process that uses a long, thin cutting tool to produce holes in metal at high depth-to-diameter ratios. Gun drilling is effective in diameters from 1 – 50 [0.04 – 2.00 in]. A differs from a conventional twist drill by its unique head geometry; a standard gundrill has a single effective cutting edge that removes chips as it advances into a metal workpiece. The gundrilling process is able to drill deep holes beyond what is possible with conventional machinery and tooling such as twist drills, by using high pressure coolant for clean chip exhaust, even at extreme depths. Menace Ii Society 1993 Download.

Gun drilling was initially developed for the manufacture of gun barrels, where both straightness and barrel durability were essential to properly functioning barrels. Ticket Maker Crackers. The gundrilling process and tooling have been refined for maximum performance and use on modern, dedicated machinery. Firearms continue to be a common application for gundrilling. Other industries include diesel fuel components, medical tooling, plastic injection molds, and more. Gun drilling can be done, with limited performance, on common CNC machines. Holes with a depth-to-diameter ratio of 20:1 or greater generally require dedicated equipment to achieve the highest productivity and process reliability, and can reach extreme ratios of 400:1 or greater. Gun drilling is the ideal process for a range of deep hole drilled depths and diameters.

Extremely deep holes and small diameter holes utilize gundrilling with specific equipment to maintain straightness and precision. Gun Drilling Diameters 1 – 3 mm Possible with proper equipment 3 – 25 mm Common 25 – 50 mm Common 50 – 75 mm Possible, but less productive than BTA drilling Gun Drilling D:d Ratios 5:1 Common twist drills 10:1 High performance twist drills with through-tool coolant 20:1 Special deep hole drilling tools with through-tool coolant 100:1 Gundrilling tools on dedicated gundrilling machine 200:1 Gundrilling tools on high performance gundrilling machine 400:1 Extreme drilling range, proprietary processes and equipment required.

The Gundrilling Handbook Most Comprehensive Book on the Subject in Decades. A comprehensive guide on gun drills and gundrilling in traditional and non-traditional. Deep Hole Drilling and Bore Machining Services. With over half a century of innovating and perfecting the art of gun drilling. Services & Capacities (68kb) PDF.