Gun drilling is a deep hole drilling process that uses a long, thin cutting tool to produce holes in metal at high depth-to-diameter ratios. Gun drilling is primarily used 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.
Gun drilling was initially developed for cutting or machining gun barrels, where both straightness and barrel durability were essential to properly functioning barrels and accuracy.
Firearms are a common application for gun drilling, however, other common uses are moldmaking, diemaking, medical tooling , plastics/injection molds, combustion engine components, crankcases, cylinder heads, and musical instruments.
