Types
There are three basic types of deep hole drilling . Processes are categorized by how the cutting coolant flushes heat and chips from the cutting face. The three types of deep drilling are:
- gun drilling - The cutting tool is a fluted solid rod that has a bole bored down the center. Coolant is pumped through a hole in the inside of the drill. It flows back outside the drill, through the flute, bringing the chips with it.
- BTA / STS (Boring and Trepanning Association / Single Tube System) - The cutting tool is a tube. Coolant is pumped in around the outside of the cutting tool and carries chips out through the center tube. Because tubes have minimum sizes, this is only an acceptable technology for holes of over 15.6mm in diameter.
- ejector system - The cutting tool is a tube with another tube nested inside. Coolant flows through the smaller tube to the cutting face and then coolant and chips flow back through the larger tube. This is only an acceptable technology for holes of over 18.4mm in diameter.
Read more about this topic: Gun Drill
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