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G42 Cutter compensation right / Nose radius compensation right

Centroid CNC12 Acorn G-code · Mill, Lathe

On mills: Cutter compensation right

Offsets the tool path to the right of the direction of travel by half the tool diameter stored in the D offset.

Format

Addresses

How it works

Modal. Cancel with G40.

Example program

The full 9-line example is in the app. Example is in inch. Check offsets and clearances first.

Watch out for

• The D number stays active, so a later G41 or G42 without D uses the last one.
• Plan the lead-in from a safe side or the comp move can nick a corner.

On lathes: Nose radius compensation right

Offsets the path right of travel by the tool nose radius stored for the active T offset. Used for most OD turning toward the chuck.

Format

Addresses

How it works

Modal. Cancel with G40.

Example program

The full 8-line example is in the app. Example is in inch. Check offsets and clearances first.

Watch out for

• CNC12 rule of thumb: OD moves toward minus Z and ID moves toward plus Z use G42.
• Program as if the lathe has the tool post at the back and the headstock on the left.

Related codes

G40 · G41

G42 on other controls

The same number can mean something different on another control.