G03 Circular interpolation counterclockwise

Brother Speedio G-code · Mill

Cuts a counterclockwise arc in the selected plane, with R or I J K like G02.

Format

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

Addresses

Address	What it does
`X Y Z`	Arc end point
`R`	Arc radius
`I J K`	Distance from start point to arc center
`F`	Feed rate

How it works

Modal, motion group.

Example program

G00 X1. Y0 (ARC START)
G01 Z-.1 F10. (FEED DOWN)
G03 X0 Y1. R1. F20. (90 DEGREE CCW ARC)
G00 Z1. (RETRACT)

Example is in inch. Check offsets and clearances first.

Watch out for

With G41 and climb milling on an inside pocket, arcs are usually G03.
Keep R arcs under 180 degrees or use a negative R for the long way.

Related codes

G02 · 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
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
Fadal	Circular interpolation counterclockwise
Swiss (Citizen Star)	Circular move counterclockwise

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