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There are two
basic methods of entering new positions into a CNC program, Absolute and
Incremental (sometimes called Relative).
The mode is
controlled with two G codes, G90 and G91. G90 sets Absolute mode and is
usually the default. G91 sets Incremental. G90 and G91 are group modal.
The mode will be active until the next G90 or G91 is programmed.
In Absolute mode
all positions entered are relative to the current Datum or Zero Point.
In Incremental
mode all positions are relative to the last point programmed.
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