Gun Drill: Precision Tool for Deep Hole Drilling

A gun drill is a special type of cutting tool used to make deep, straight, and accurate holes in metal and other materials. Unlike regular twist drills, gun drills are designed for drilling holes that are much deeper than their diameter. Because of this unique ability, gun drills are widely used in industries where precision and consistency are very important.

The design of a gun drill is simple but very effective. It has a long, straight body with a single cutting edge at the tip. Along one side of the tool, there is a groove that helps remove chips from the hole during drilling. Coolant is supplied through a hole inside the drill and reaches directly to the cutting edge. This coolant keeps the tool cool and pushes the chips out smoothly, which helps prevent tool damage and ensures clean drilling.

Gun drills are commonly used in many industries such as automotive, aerospace, defense, oil and gas, and mold making. In the automotive industry, they are used to drill deep holes in parts like crankshafts, camshafts, and fuel system components. In mold making, gun drills are used to create cooling channels inside molds, which helps improve production quality and reduce cooling time.

One of the biggest advantages of using a gun drill is the high accuracy it provides. It produces straight holes with a smooth surface finish, often reducing or eliminating the need for extra finishing processes like reaming or honing. This saves both time and cost in manufacturing. Gun drills are also known for their long tool life when used with proper speed, feed, and coolant pressure.

Gun drills are available in different sizes and materials, such as high-speed steel (HSS) and carbide, to suit various applications. With modern machines and advanced coolant systems, gun drilling has become faster and more reliable.