A deep hole drilling machine, also known as a gun drilling machine or a BTA (Boring and Trepanning Association) drilling machine, is a specialized machine tool that is used to drill deep, straight holes with high precision and accuracy. It is typically used to drill holes that are longer than five times their diameter, such as those found in the manufacture of crankshafts, gun barrels, and other similar parts.

Deep hole drilling machines typically have a long, slender spindle that holds the cutting tool, called a gun drill, which is a long, thin drill bit with a unique flute design that allows for the efficient removal of chips. The spindle is mounted on a precision head that is capable of moving along the axis of the hole being drilled, and the workpiece is mounted on a table.

Deep hole drilling machines use different methods to remove the chips generated while drilling, such as through the flutes of the gun drill, through a chip hole in the tool, or by blowing chips out of the hole with compressed air. This is one of the major differences between deep hole drilling machines and regular drilling machines.

Deep hole drilling machines are highly specialized machines that are used in a variety of industries such as aerospace, defense, automotive, and many others. They can drill into a wide range of materials, including metals, plastics, and composites, and can produce holes with tight tolerances, smooth surface finishes, and high accuracy.

Deep hole drilling machines come in different types, such as single-spindle, multi-spindle, and planetary types. They are controlled by CNC (Computer Numerical Control) systems, which enable precise and automated drilling, which makes them suitable for high-volume production runs.

Overall, deep hole drilling machine is a specialized machine tool that is used to drill deep, straight holes with high precision and accuracy. It’s typically used to drill long holes, longer than five times their diameter, and is widely used in various industries, with the capability to drill in different materials, and the ability to produce tight tolerances, smooth surface finishes and high accuracy.