Gun Drilling: A Comprehensive Guide to Precision Machining

Gun drilling is a type of deep hole drilling method used to create precise, straight and deep holes in metal parts. This machining process is widely used in various industries such as aerospace, medical, and firearms, where accuracy and precision are critical. In this article, we will discuss gun drilling in detail, its working principle, benefits, and applications.

What is Gun Drilling?

It is a precision machining process that uses a long, thin cutting tool to create deep and narrow holes in metal workpieces. The cutting tool, known as a gun drill, is fed into the workpiece axially and rotated at high speed to remove metal and create a hole. The cutting tool is guided by a guide bush, which supports and aligns the cutting tool and prevents it from deflecting during the cutting process.

How does Gun Drilling Work?

It works by combining the high rotational speed of the cutting tool with a highly lubricated coolant. The coolant is pumped through the center of the cutting tool and onto the cutting edge to reduce heat generated during the cutting process and increase tool life. The cutting tool is fed into the workpiece at a controlled rate, creating a precise and straight hole.

Benefits of Gun Drilling

  1. Precision: It provides highly accurate and straight holes, making it ideal for applications where precision is critical.
  2. Deep Hole Capability: It can produce deep holes with a high aspect ratio, meaning that the ratio of the depth of the hole to its diameter is high.
  3. Improved Surface Finish: It produces a smooth and uniform surface finish, reducing the need for additional finishing operations.
  4. High Material Removal Rate: It is capable of high material removal rates, reducing machining time and increasing productivity.
  5. Increased Tool Life: The use of coolant in gun drilling increases tool life, reducing the frequency of tool changes and increasing overall efficiency.

Applications of Gun Drilling

  1. Aerospace: It is commonly used in the aerospace industry for the production of engine parts, such as fuel injectors, where precision and accuracy are critical.
  2. Medical: It is widely used in the medical industry for the production of surgical instruments and implants, such as bone screws and pins, where high precision and smooth surfaces are required.
  3. Firearms: It is used in the firearms industry for the production of barrels and other gun components, where precise and straight holes are critical for accuracy and performance.
  4. Automotive: It is used in the automotive industry for the production of transmission and engine parts, such as shafts and gears, where precision and high material removal rates are required.
  5. Energy: It is used in the energy industry for the production of oil and gas drilling components, where deep and precise holes are critical for performance and safety.


In conclusion, It is a precision machining process that provides highly accurate and straight holes in metal workpieces. With its deep hole capability, improved surface finish, high material removal rate, and increased tool life, gun drilling is widely used in a variety of industries where precision and accuracy are critical. Whether you’re in aerospace, medical, firearms, automotive, or energy, gun drilling can provide the precision and quality you need for your application.


1.What is gun drilling?

Ans: It is a precision machining process that creates precise and straight deep holes in metal work pieces.

2.How does gun drilling work?

Ans:Gun drilling works by combining high rotational speed with a highly lubric





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