Cutter Compensation Cancel (G40)

Definition

Cancels tool radius compensation. Cancel compensation only after the tool has a safe exit from the compensated wall.

Formula / Rule

• Issue G40 on a clean lead-out so the controller can remove radius shift without gouging the part.
• Do not cancel compensation inside a tight corner or while the tool is still buried in the wall.

Typical Range

• Use it before retract, tool change, or any move that should no longer follow compensated geometry.

Shop-floor Scenarios

• Cancel on the lead-out move after the finish pass.
• Confirm G40 appears in restart lines before manual recovery moves.

Common Errors / Troubleshooting

• If the tool marks the wall at exit, lengthen the lead-out and review path direction.
• If restart motion is unsafe, verify whether compensation was canceled in the previous block.

Related Tools

• G/M Code Reference
• G-code Viewer