Gun Drill - 3: Gun Drilling
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WARNING: Machine tools present a safety hazard. Improper operation can result in severe injury. These topics are for non-laboratory study only and are not to be used in conjunction with the operation of any tool or machine described herein. Never use a machine tool without the supervision of a qualified instructor.
With an accuracy of 0.0002 in/in the gun-drill has become accepted in almost every industry for short and deep hole drilling. The design of this tool is still being modified particularly with increasing number of CNC machining centers using gun-drills. Although there are a number of designs there are two basic types of chip removal: external and internal .
The external type removes ships by flushing them down the outside via the drill flutes where they exit into a chamber. A chip deflector is used to clean the flutes of sticky chips.

The internal chip removal type flushes chips out a center hole in the drill. Chips exit the rear of the drill bit.


Gun-drills normally have a single carbide tip that is brazed or fastened on. A straight, concentric and burnished hole is maintained by having a bushing or wear-pads mounted to the drilling head the same size as the hole. The depth that gun drilling is able to reach is limited only by the machinery and support tooling.
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