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G03 Circular move counterclockwise

Mitsubishi M70 M80 G-code · Mill

Cuts a counterclockwise arc in the selected plane using R or I J K. Adding a third axis gives a helical move.

Format

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

Addresses

Address	What it does
`X Y Z`	End point of the arc
`R`	Arc radius
`I J K`	Distance from start point to arc center, always incremental
`F`	Feed rate

How it works

Modal, group 01.

Example program

G00 X2. Y1. (ARC START)
G01 Z-.2 F8. (FEED TO DEPTH)
G03 X1. Y2. R1. F12. (90 DEGREE ARC)
G00 Z.1 (CLEAR)

Example is in inch. Check offsets and clearances first.

Watch out for

With G41 climb milling an inside pocket, arcs are counterclockwise.
If the end point is not on the arc, the control alarms when the error is over the parameter limit.

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

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