4.10.3 G90/G91: Absolute Programming/Incremental Programming
Format:
G90: Programming in absolute positions
G91: Programming in incremental values
In the axial movement G command give, each axis value its destination and may be an absolute coordinate value or a relative increment value, which are respectively set by G90 and G91. If the tool is moved from A (150, 300, 120) to B (100, 240, 90), use the absolute coordinate planning program (G90) as G90 X100 Y240 Z90; as shown in the figure below.
G90: Programming in Absolute Positions
Use the relative incremental coordinate planning program (G91) as G90 X-50 Y-60 Z-30; as shown below.
G91: Programming in Incremental Values