Definition of terms

Term	Description/explanation
ACS	Axis coordinate system
Down channel	Main channel that starts the erosion process and defines the machining mode.
Escape channel	Auxiliary channel that executes the electrode escape motion using a defined escape strategy.
Flushing	Long-term or fast electrode escape motion initiated by the PLC to flush the spark gap.
HLI	The High Level Interface (HLI) is an interface between the PLC and the CNC.
MCS	Machine coordinate system: First 3-dimensional Cartesian coordinate system.
Orbit channel	Auxiliary channel where the electrode orbit motion is programmed in the XY plane.
Orbit geometry	Geometry of the workpiece in the XY plane superimposed on the YZ plane during expansion.
Orbit disc	An orbit disc results when the down channel is stopped at a specific height (e.g. by inserting a stop label) and the orbit channel continues to move on its geometry.
PCS	The programming coordinate system is a Cartesian coordinate system which specifies positions in the NC program.
RZ plane	Plane consisting of radius and Z axis
TCP	Tool centre point
GEP	Geometry for erosion on the path
EDM	Electrical discharge machining