What is a common safety measure regarding personal protective equipment (PPE) in CNC milling?

Wearing safety glasses and hearing protection is a common safety measure in CNC milling because it directly addresses two significant risks present in a machining environment. Safety glasses protect the eyes from flying debris, coolant, or chips generated during machining processes, which are common hazards in CNC milling. Hearing protection is essential due to the loud noise levels produced by CNC machines, which can lead to hearing loss over time if not mitigated. These elements of personal protective equipment are critical in maintaining safe working conditions and ensuring the wellbeing of the operator.

The other options do not align with proper safety practices. Loose clothing can be a safety hazard, as it may get caught in moving machinery. Gloves that do not fit tightly can pose risks as well, since they can snag on machinery or interfere with precision work. Simply using all types of PPE available does not ensure safety; effective PPE selection must be tailored to the specific hazards of the task being performed.