System information

SECTION FOUR - PREPARATORY FUNCTIONS (G CODES)
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G89
Note: The initial level means the value of the Z axis when the canned cycle is first turned on.
The figure below shows how to specify data in G90 or G91 mode.
Absolute and Incremental Programming
If the tool is to be returned to point R or to the initial level, it is specified by G98 or G99. (See
figure below.) Use G99 for the first hole, and use G98 for the last hole. When the canned cycle is
repeated in G98 mode, the tool is returned to the initial level after each hole.
In the G99 mode the initial level does not change, and the tool is returned to the R point after
each hole.
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