System information

SECTION FOUR - PREPARATORY FUNCTIONS (G CODES)

Tool length offset (G43, G44, G49)

A tool length offset is activated using a G43 or G44 command.

Command format:

G43 Z ____ H____; (Z moves to dimension selected

G44 referenced to tool length offset

or selected by H)

G43 H____;

G44

G43 H10; 1st offset

H14; 2nd offset

H13; 3rd offset

H15; 4th offset

The direction of the offset is controlled by G43 and G44; the magnitude of the offset is set by the

offset value in the H table.

G43 is a + offset (value in H table is added to axis)

G44 is a - offset (value in H table is subtracted from axis)

Once a G43 or G44 offset is activated it will remain in effect until canceled by a G49 or changed

with another H offset. The H offsets can be changed throughout the program without canceling

the previous offset with a G49 or H00. The new H offset will automatically take effect in either

the G43 or G44 mode, whichever is active at the time the new H offset is executed. The offsets

for the current tool are active at the start of all programs and any H offsets before G43 or G44

will zero out the tool offset. After a G49 or H6 is executed, H offsets are ignored until a G43 or

G44 is executed. The H offsets will always be added to the axis perpendicular to the current

plane at the time the H offset is activated.

G17 XY plane H add/sub Z axis

G18 XZ plane H add/sub Y axis

G19 YZ plane H add/sub X axis

If an H offset is activated in the G17 XY plane and then the plane is switched to G18 XZ plane,

the offset will remain in effect and still be added to the Z axis. However, if another H offset is

activated while still in the G18 XZ plane, it will be added to the Y axis. Both offsets will be in

effect, one on the Z axis and one on the Y axis, until they are canceled by a G49 or changed by

another H offset.

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