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G29 Last position becomes the pole
Heidenhain TNC (ISO) G-code · Mill
Takes the last programmed position as the pole and circle center. Klartext: CC with no coordinates.
Format
G29
Addresses
| Address | What it does |
|---|---|
G29 | No addresses |
How it works
Non-modal block. The new pole stays active until another pole is set.
Example program
N50 G01 X+50 Y+50 F300 *
N60 G29 *
N70 G11 G41 R+20 H+0 *
N80 G13 H+180 *
N60 G29 *
N70 G11 G41 R+20 H+0 *
N80 G13 H+180 *
Example is in inch. Check offsets and clearances first.
Watch out for
- Handy for arcs that start where the last move ended.
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 |
| Centroid CNC12 Acorn | Return from reference point |
| Hurco WinMax (NC) | Return from reference point |
| Fadal | Return from zero |
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