
Gun Drilling

Gun-drilling is a machining process specifically designed to create deep, precise, and straight holes in metal, especially steel. It was originally developed for creating gun barrels—hence the name. This technique is valued in industries like automotive, aerospace, and mold-making, where precise deep holes are essential. Here’s an overview:
- Process: Gun-drilling uses a specialized drill bit called a “gun drill,” which has a single cutting edge and a hollow body. Coolant is pumped through this hollow body to lubricate and cool the bit while also flushing chips out of the hole.
- Applications: Gun-drilling is ideal for creating holes with very high length-to-diameter ratios. It’s used for oil passages, hydraulic systems, and other parts requiring deep holes in steel.
- Precision and Finish: Gun-drilling offers exceptional precision, with very tight tolerances. The surface finish of gun-drilled holes is usually smooth and consistent, which can reduce the need for additional finishing processes.
- Advantages: The process provides better straightness, accuracy, and finish than conventional drilling methods for deep holes. The continuous coolant flow prevents heat buildup, which helps maintain tool life and hole quality.