Which of the following rules apply when using the milling machine?

• A. Never bring anything within 6 inches of the cutting zone while the spindle is running
• B. Always remove parallels after clamping the workpiece in the vise
• C. Always lock the quill in the uppermost position before changing tools
• D. All of the above

Answer: (D)

Operating a milling machine safely requires following a set of rules that prevent injury and equipment damage. Keeping any material or object away from the cutting zone while the spindle is running avoids entanglement and contact with the rotating cutter. It also helps prevent chips or pieces from being drawn into the cutter. After clamping a workpiece in the vise, removing the parallels prevents loose pieces from being struck by the tool or interfering with the setup, which helps maintain proper alignment and avoid damage. Locking the quill in the uppermost position before changing tools stops the quill from dropping or shifting unexpectedly, protecting your hands and ensuring a safe tool change. Because these rules address different, common hazards, all of them apply.