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G41 Cutter compensation left / Nose radius compensation left

Centroid CNC12 Acorn G-code · Mill, Lathe

On mills: Cutter compensation left

Offsets the tool path to the left 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

• CNC12 stores a diameter, not a radius. The path moves by half of the D value.
• Turn it on before reaching the part, on a lead-in that does not cut the part.
• Parameter 99 sets how many moves ahead comp looks to avoid gouges.

On lathes: Nose radius compensation left

Offsets the path left of travel by the tool nose radius stored for the active T offset. Needed for tapers and arcs.

Format

Addresses

How it works

Modal. Cancel with G40.

Example program

The full 7-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 plus Z and ID moves toward minus Z use G41.
• Set the nose radius and nose vector in the tool offset library or the comp goes the wrong way.

Related codes

G40 · G42

G41 on other controls

The same number can mean something different on another control.