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G29 Return from reference point
Centroid CNC12 Acorn G-code · Mill and lathe
Moves back to the middle point stored by the last G28 or G30, then on to the given position.
Format
G29 [X] [Y] [Z]
Addresses
| Address | What it does |
|---|---|
X Y Z | Final position after the middle point |
How it works
One shot. Needs a G28 or G30 earlier in the job.
Example program
G28 G91 Z0 ; Z HOME
G90 ; ABSOLUTE
G29 X1. Y2. ; BACK THROUGH THE MIDDLE POINT TO X1 Y2
G90 ; ABSOLUTE
G29 X1. Y2. ; BACK THROUGH THE MIDDLE POINT TO X1 Y2
Example is in inch. Check offsets and clearances first.
Watch out for
- If Z moves down, X and Y move first, then Z.
Related codes
G29 on other controls
The same number can mean something different on another control.
| Control | Meaning |
|---|---|
| Fanuc | Return from reference position |
| Haas NGC | Return from reference point |
| Mitsubishi M70 M80 | Return from reference position |
| Brother Speedio | Return from reference point |
| Heidenhain TNC (ISO) | Last position becomes the pole |
| Hurco WinMax (NC) | Return from reference point |
| Fadal | Return from zero |
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