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G40 Cutter radius comp cancel / Tool nose radius comp cancel

Mitsubishi M70 M80 G-code · Mill, Lathe

On mills: Cutter radius comp cancel

Cancels cutter radius compensation. The tool moves back to the programmed path on the next move.

Format

G40

How it works

Modal, group 07.

Example program

G01 X-1. Y0. (LEAVE PART)
G40 G00 X-1.5 (CANCEL ON MOVE OFF)
Z1. (CLEAR)

Example is in inch. Check offsets and clearances first.

Watch out for

Cancel on a move away from the part, not on a feature edge, or the tool will gouge.

On lathes: Tool nose radius comp cancel

Cancels tool nose radius compensation.

Format

G40

How it works

Modal, group 07.

Example program

G01 X2.2 F.01 (LEAVE PART)
G40 G00 X3. Z.1 (CANCEL ON RETRACT)
G28 U0 (HOME X)

Example is in inch. Check offsets and clearances first.

Watch out for

Cancel on a move away from the part.

Related codes

G41 · G42 · G46

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
Brother Speedio	Cutter compensation cancel
Siemens 840D 828D	Cancel tool radius compensation
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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