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G27 Tangential departure on an arc
Heidenhain TNC (ISO) G-code · Mill
Leaves the last contour point on a tangential arc of radius R. Program it after the last contour element, then cancel compensation with G40 in the next block. Klartext counterpart: RND before the exit, or DEP CT.
Format
G27 R [F]
Addresses
| Address | What it does |
|---|---|
R | Radius of the departure arc |
F | Feed rate for the departure |
How it works
Non-modal.
Example program
N140 X+5 *
N150 G27 R5 F500 *
N160 G40 X-20 Y-20 F1000 *
N170 G00 Z+250 M2 *
N150 G27 R5 F500 *
N160 G40 X-20 Y-20 F1000 *
N170 G00 Z+250 M2 *
Example is in inch. Check offsets and clearances first.
Watch out for
- Cancel G41 or G42 with G40 in the block after G27, not before.
Related codes
G27 on other controls
The same number can mean something different on another control.
| Control | Meaning |
|---|---|
| Fanuc | Reference position return check |
| Mitsubishi M70 M80 | Reference position check |
| Brother Speedio | Reference point return check |
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