CNC Machinist Calculator UltraG3 Circular interpolation counterclockwise
Fadal G-code · Mill
Cuts a counterclockwise arc or helix at feed rate F in the selected plane. The center comes from I J K or the radius word.
Verify on your machine. This entry could not be fully checked against the maker manual. Check your machine manual before you run it.
Format
G3 X Y [Z] I J [K] F or G3 X Y R F
Addresses
| Address | What it does |
|---|---|
X Y Z | End point of the arc |
I J K | Arc center, distance from the start point |
R | Arc radius, used instead of I J K |
F | Feed rate |
How it works
Modal, motion group. Cancel with G0, G1 or a fixed cycle.
Example program
N1 G0 G40 G49 G80 G90 G17 (FORMAT 2 SAFE START)
N2 T1 M6 (1-2 END MILL)
N3 G0 G90 G54 X1. Y0. S3000 M3
N4 G43 H1 Z.1 M8
…
N2 T1 M6 (1-2 END MILL)
N3 G0 G90 G54 X1. Y0. S3000 M3
N4 G43 H1 Z.1 M8
…
The full 7-line example is in the app. Example is in inch. Check offsets and clearances first.
Watch out for
- I J K are the distance from the start point to the arc center in Format 2, like Fanuc.
- A full circle needs I J. Leave the end point the same as the start point.
- Old Format 1 programs may treat the center differently. Prove out an old program in single block before you trust it.
- Add a Z word for a helical move. Pick the plane first with G17, G18 or G19.
Related codes
G3 on other controls
The same number can mean something different on another control.
| Control | Meaning |
|---|---|
| Fanuc | Circular interpolation counterclockwise |
| Haas NGC | Circular interpolation counterclockwise |
| Mazak (EIA) | Circular interpolation, counterclockwise |
| Okuma OSP | Circular interpolation counterclockwise |
| Mitsubishi M70 M80 | Circular move counterclockwise |
| Brother Speedio | Circular interpolation counterclockwise |
| Siemens 840D 828D | Circular interpolation counterclockwise |
| Heidenhain TNC (ISO) | Counterclockwise arc, Cartesian |
| Fagor 8055 8065 | Counterclockwise circular interpolation |
| LinuxCNC Tormach | Counterclockwise arc or helix |
| Mach3 Mach4 | Counterclockwise arc |
| Centroid CNC12 Acorn | Counterclockwise arc or helix |
| Hurco WinMax (NC) | Circular or helical move counterclockwise |
| Swiss (Citizen Star) | Circular move counterclockwise |
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