G03 Counterclockwise circular interpolation

Fagor 8055 8065 G-code · Mill and lathe

Counterclockwise arc at feed rate. Same format as G02: end point plus I J K center or R radius.

Format

G03 X Y I J [F] or G03 X Y R [F]

Addresses

Address	What it does
`X Y`	End point of the arc
`I J K`	Arc center, incremental from the start point unless G06 is used
`R`	Arc radius, negative for arcs over 180 degrees
`F`	Feed rate

How it works

Modal. Replaced by G00, G01, G02, G33 or G34.

Example program

G00 G90 G17 X1.0 Y0 (START POINT)
G01 Z-0.1 F10.0 (FEED DOWN)
G03 X0 Y1.0 I-1.0 J0 F15.0 (QUARTER ARC CCW)
G00 Z1.0 (RETRACT)

Example is in inch. Check offsets and clearances first.

Watch out for

Direction is seen from the positive side of the axis perpendicular to the plane. Check the plane with G17, G18 or G19.
On lathes the arc direction also depends on the turret side.

Related codes

G02 · G06 · G17

G03 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
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
Fadal	Circular interpolation counterclockwise
Swiss (Citizen Star)	Circular move counterclockwise

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