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Gun drilling

Chip-breaking machining where the hole is drilled with a tool that allows the chips to be evacuated by the coolant via an external channel.

Illustration of Gun drilling

The process

The drilling head usually has only one cutting edge [1] and the cutting fluid is supplied to the cutting zone of a channel [2] within the drill head. To permit long, straight holes the drill is often supported by a control unit [3] placed near the entrance.

While the drill works, a coolant is pumped through the channels of the drill tube at high pressure which transports the chips via an outer axial channel [4].

Cutting fluid
Cutting fluid has three main purposes. Cooling, lubrication and removal of chips.
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Advantages and disadvantages
In comparison with alternative methods
Very deep holes can be drilled
Good surface finish
Holes can be produced with an interference
expensive tools