services
Services : Gun Drilling
| Gun drills are straight fluted drills which allow coolant (either compressed air or a suitable liquid) to be directed through the drill's body, directly to the cutting face. They are used for deep drilling (depth to diameter ratios of 100 to 1 or more are possible), of which gun barrels are the obvious example. Other uses include the manufacture of woodwind instruments, such as uilleann pipes, as gun-drills are capable of drilling long straight holes in metal, wood and some plastics. The coolant provides lubrication and cooling to the cutting edges as well as ejecting the swarf or chips back out the drills length. Modern gun drills take advantage of carbide tips to reduce expense and prolong life.Depending on the material being drilled, a high speed drill can cut a hole in P20 steel 30 inches per min. |
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It is difficult to drill a deep hole (where deep is approximately 3 times the diameter of the hole) that is both straight and accurately sized with a standard twist drill. This is a problem in many manufacturing processes, especially the firearms industry. The barrel of a gun must be very straight and quite accurately sized. Gun barrels are far longer than their inside diameter; as an example, the .224 inch (5.56 mm) barrel of the M-16 rifle is 20 inches (508 mm) long, nearly 90 times the diameter. Thus the gun drill was invented to create these long straight holes.
At Fastco we can drill hole sizes .187 dia. to 1.25 dia. and our machine will drill 87" in one direction.1120 Airport Parkway SW • Gainesville, GA 30501 • Ph. 770-532-9101 • Fax 770-536-7100
bstewart@fast-goproducts.com • ckidd@fast-goproducts.com
bstewart@fast-goproducts.com • ckidd@fast-goproducts.com