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G12.1 Polar coordinate interpolation on
Swiss (Citizen Star) G-code · Lathe
Turns X and C into a flat XC plane so a live tool can mill flats, hex and slots on the part face.
Verify on your machine. This entry could not be fully checked against the maker manual. Check your machine manual before you run it.
Format
G12.1
Addresses
| Address | What it does |
|---|---|
X C | Programmed as flat X and C contour after G12.1 |
How it works
Modal. Cancel with G13.1.
Example program
M18 (CITIZEN C AXIS ON)
G98 G00 X.6 C0. T1100 (END MILL ON FACE)
G12.1 (POLAR ON)
G01 X.3 C.173 F6. (FLAT OF A HEX)
…
G98 G00 X.6 C0. T1100 (END MILL ON FACE)
G12.1 (POLAR ON)
G01 X.3 C.173 F6. (FLAT OF A HEX)
…
The full 6-line example is in the app. Example is in inch. Check offsets and clearances first.
Watch out for
- C axis must be on first. On Citizen that is M18. Feed is inches per minute here, so set G98.
- Start and end the contour away from the center to avoid fast C moves at X zero.
Related codes
G12.1 on other controls
The same number can mean something different on another control.
| Control | Meaning |
|---|---|
| Fanuc | Polar coordinate interpolation on |
| Mazak (EIA) | Polar coordinate interpolation on |
| Mitsubishi M70 M80 | Polar coordinate interpolation on |
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Open G12.1 in the app All Swiss G-codes