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CNC Machining, G codes, G90 Absolute Input

12/09/2009

A control mode in which the motion data input is in the form of absolute dimensions. The values programmed with the axis words are the locations to move to in relation to the current zero position.

Since blocks are processed in a left to right order, both G90 and G91 may appear in the same block. G90 and G91 are position sensitive; therefore the moves to the left of the G90 code will be in absolute until the G91 code is used.

The G90 code is modal and will remain in effect until the G91 code is used.

EXAMPLE:
N12 G90 X2.0 G91 Y1.0 The X move will be absolute; the Y move will be incremental
N13 Z-.02 G5 This Z move will be incremental
N14 G90 X4. This X move will be absolute


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