3509
Machining Interference Occurred
Fanuc · Manual Guide Milling and Turning
What does 3509 mean?
This MC alarm (specific to Series 30i) indicates that an interference has occurred during machining, such as the tool path colliding with the opposite machining area or an existing feature. A common cause is a cutter radius being too large for the defined machining area, posing a risk of tool breakage or part damage.
Repair Steps
- 1
Modify the machining program to resolve the interference, potentially by adjusting the cutter radius, optimizing the tool path, or altering the machining area.
Verified technical data. Last updated: March 2026
Source: Fanuc Manual Guide Milling and Turning