The process of making holes into the surface of the earth or other materials using drilling machines is called drilling. The machines have drill bits attached to them and rotated at variable speeds. The drill is usually pressed against the material or soil before rotating the drill. Chips are cut and ejected out through various mechanisms as the drill makes holes into the workpiece.

The holes produced vary in size, shape, depth, and other characteristics depending with various factors. Some among the factors include size of the drill bit, speed of rotation, purpose of the hole, and nature of the material or soil among others. There are many types of drilling. The most common ones are microdrilling, deep hole, spot, center, gun, trepanning, and vibration drilling. Deep hole drilling machine is just one kind of machines used for this process.

Spot boring refers to a kind of boring operation that is performed as part of preparation before the actual boring starts. As such, the holes drilled in spot boring only work to guide the team when making the actual holes. They follow the holes to make other larger holes. Spot holes are usually drilled only halfway or to a much lesser depth just to provide guidance. The actual boring operation therefore comes out perfect and precise as needed.

Center boring is performed to prepare for further boring activity just like in spot boring. The resultant holes of center boring function as centers of rotation for boring operation that are performed afterwards. This process makes use of a special kind of drill known as a center drill. One should know that there are different tools used for the various kinds of boring operations. The nature of the process is what determines the choice of the tool to be used.

Deep hole boring refers to a special kind of boring activity. In this process, lengths of holes made exceed the diameters at least ten times in measurement. Accomplishing this task needs special tools so as to attain straightness and maintain tolerances. Other considerations kept in mind during the process are surface finish and roundness.
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Deep hole boring can be done using a few tooling methods. The most commonly used methods are BTA and gun drilling. These two methods are different from each other because of the way that they remove chip and how coolants enter. Chip removal and coolant entry methods can be classified as internal or external. Straightness tolerance is achieved using various methods like counter rotating workpiece and rotating tool.

Secondary tooling methods employed comprise of skiving and burnishing, pull boring, trepanning, and bottle boring. The latest technique is called the vibration boring. This method employs small controlled axial vibrations from drill bits to break away chips coming from workpieces. The generated chips are then removed via flutes on the drill.

Acoustic emission, torque, force, and vibrations need to be controlled. Control of those aspects is done using high tech monitoring systems. Cooling is achieved using a special kind of coolant.

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