Chip-breaking process where the hole is drilled with a tool that allows the chips to be evacuated by the coolant through a single channel. Beskrivning The process The drill tube [1] by which coolant is supplied fixed by pressure on the workpiece where a seal [2] ensures that this contact is tight. A hollow drilling tool [3] passes through the drill tube with a rear part between the drill tube and the drill is sealed [4]. While the drill works, a coolant is pumped in through the drill tube [5] at high pressure, enclosing the drill. Broken chip from the cutting inserts are efficiently transported out of the liquid through the tool cavity [6]. STS Drilling 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
