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Deep Hole Drilling With Gun Drills

  • Monday, 02 June 2025
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Deep Hole Drilling With Gun Drills

Deep hole drilling with gun drills offers a way to make straighter more accurate holes in metal workpieces that are beyond the capabilities of conventional twist drills.deep hole drilling with gun drills It is especially useful in the automotive and aerospace industries for machining components that must meet stringent specifications and tolerances such as fuel injectors, hydraulic systems, and other equipment parts.

To do its job, the gun drill must be pumped with coolant that is pressurized so it can force chips back down along the shank of the tool and out through the single flute cutting edge. This requires a special drill and a dedicated machine that is capable of generating the required volume of high-pressure fluid flow.

The coolant can be pumped through an internal passage inside the drill, and it may also be directed to the tip of the drill by using a venturi effect. The drills are often made with solid or brazed carbide tips to reduce cost and lengthen tool life.

It is important that the coolant reach the tip of the drill to evacuate chips and provide lubrication. A common cause of gumming or chipping is that the coolant doesn’t get to the tip fast enough and/or it can’t push up against the chips as they break off from the cutting edge.

When it comes to the speed at which the drill cuts and the feed rate, there are some specific considerations that must be taken into account based on the material being drilled and the desired result. A drill manufacturer will be able to advise on the best speeds and feeds for a particular application.

Another factor that influences the ability of a drill to cut straight holes is its geometry. Most gun drills have a parabolic flute shape that is good for chip evacuation but not as good for guiding the tool or positioning it in the hole. For this reason, the tip of a gun drill is often ground with a nose grind and relief that is more suited to the type of material being drilled.

The bottom line is that when the right drill and the appropriate equipment are used, it is possible to achieve l:d ratios up to 400:1 with the gun drilling process on a specialized machine. This allows manufacturers to produce components that comply with the strictest industry standards and provide a valuable manufacturing advantage to their customers. The resulting parts are more accurate, less costly to manufacture, and can improve performance, efficiency, and safety. It is this advantage that makes the gun drilling process a critical part of the modern automotive and aerospace industries.

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