Which statement is true about keeping objects away from the milling cutting zone while the spindle is running?

• A. It is unsafe to bring anything within 6 inches of the cutting zone
• B. It is acceptable to touch the tool during operation
• C. It is okay to reach over the rotating spindle if careful
• D. It is fine to have parts within reach if clamped

Answer: (A)

Keep clear of the milling cutting zone while the spindle is running because a spinning cutter can grab anything near it and pull it into the tool, causing serious injury. The best statement mirrors this safe practice by saying that bringing anything within a small distance of the cutting zone is unsafe—about six inches is a common buffer to reduce the risk of entanglement and being struck by ejected chips.

Touching the tool during operation is hazardous because the cutter is moving rapidly and can cause deep cuts or be difficult to withdraw from if anything grabs you. Reaching over the rotating spindle is also dangerous for the same reason—loss of control if something catches you or you break your line of sight to the cutter. Having parts within reach if they are clamped might seem stable, but it still poses a risk if the spindle is running or if you need to adjust things; clamps don’t eliminate the hazard, and you should only interact with the setup when the machine is powered off and the spindle has stopped.