G09 Arc defined by three points

Fagor 8055 8065 G-code · Mill and lathe

Arc through three points: the start point, an intermediate point given with I J, and the end point given with X Y.

Format

G09 X Y I J

Addresses

Address	What it does
`X Y`	End point of the arc
`I J`	Intermediate point, in the same coordinates as X Y

How it works

Not modal. G09 can not be used for a full circle.

Example program

G00 G90 G17 X0 Y0 (START POINT)
G01 Z-0.1 F10.0 (FEED DOWN)
G09 X2.0 Y0 I1.0 J1.0 F15.0 (ARC THROUGH X1 Y1)
G00 Z1.0 (RETRACT)

Example is in inch. Check offsets and clearances first.

Watch out for

I J here are a point on the arc, not the center.
The control finds the direction from the three points.

Related codes

G08 · G02

G09 on other controls

The same number can mean something different on another control.

Control	Meaning
Fanuc	Exact stop, one block
Haas NGC	Exact stop, one block
Okuma OSP	Exact stop, one block
Mitsubishi M70 M80	Exact stop check, one block
Brother Speedio	Exact stop check
Siemens 840D 828D	Exact stop, one block
Mach3 Mach4	Exact stop, one block
Centroid CNC12 Acorn	Decelerate and stop, one block
Hurco WinMax (NC)	Exact stop, one block
Fadal	Decelerate with feed ramps, exact stop

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