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G40 Cancel tool radius compensation

Siemens 840D 828D G-code · Mill and lathe

Turns off G41 and G42. The tool center or tool tip runs on the programmed path again. Cancel on a G0 or G1 move away from the contour.

Format

G40 G1 X Y

Addresses

Address	What it does
`X Y`	Point off the contour where compensation ends

How it works

Modal, G group 7 (radius compensation).

Example program

G41 G1 X0 Y5 F400 ; COMP ON
G1 Y40 ; CUT
G40 G1 X-10 Y50 ; COMP OFF, MOVE AWAY
G0 Z50 ; RETRACT

Example is in inch. Check offsets and clearances first.

Watch out for

Cancel on a linear move. Cancelling on an arc gives an alarm.
G40 does not turn off tool length. D0 turns off all tool offsets.

Related codes

G41 · G42

G40 on other controls

The same number can mean something different on another control.

Control	Meaning
Fanuc	Cutter compensation cancel
Haas NGC	Cutter compensation cancel
Mazak (EIA)	Cutter radius compensation cancel
Okuma OSP	Cutter radius compensation cancel
Mitsubishi M70 M80	Cutter radius comp cancel
Brother Speedio	Cutter compensation cancel
Heidenhain TNC (ISO)	Cancel radius compensation
Fagor 8055 8065	Cancel tool radius compensation
LinuxCNC Tormach	Cutter compensation off
Mach3 Mach4	Cutter comp cancel
Centroid CNC12 Acorn	Cutter compensation cancel
Hurco WinMax (NC)	Cutter compensation cancel
Fadal	Cutter radius compensation cancel
Swiss (Citizen Star)	Nose radius compensation cancel

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