The Deep Hole Drilling Process

There are three different systems for deep hole drilling:

The Gun Drill System

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This system is used for small diameters.

Can easily be applied in a machining centre by using a pre drilled hole for guidance.

Requires high coolant pressure.

The Single Tube System 

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In materials with poor chip forming properties such as stainless steel and low-carbon steel.

In materials with an uneven structure when chip breaking problems exists.

More advantageous for long series production.

Uniform and extremely long working pieces.

For hole diameters larger than 200mm.

Requires special deep hole drilling machines.

 

The Ejector System 

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Requires no seal between the work-piece and drill bushing.

Adapted easily to existing machines, preferable in conventional lathes, turning centres, machining centres and horizontal boring machines.

For machining work-pieces where sealing problems can can arise.

An advantage when it is possible to use a pre-drilled hole instead of a drill bushing for guidance, for example in machining centres.