Safety, Health, and Environmental Practices
What the candidate must know
Safety questions on NIMS-style exams test whether you can recognize a hazard and pick the control that matches it. Know the hierarchy of controls (elimination, engineering controls such as guards and interlocks, administrative controls, then PPE as the last line of defense). Understand PPE requirements around rotating tooling: safety glasses with side shields, hearing protection in high-noise areas, safety footwear, and the rule that loose clothing, jewelry, and gloves are kept away from spindles and chucks. Know lockout/tagout (LOTO) - energy isolation, verification of zero energy, one lock per person, and the principle that an Emergency Stop is a control, not an isolation device.
Also know hazard communication and Safety Data Sheets (SDS), coolant mist and skin exposure, metal chip handling (sharp edges, hot chips, never using bare hands or compressed air), lifting technique, housekeeping, spill response, and fire extinguisher classes. Environmental topics include coolant disposal, oily rag and chip recycling, and not pouring used coolant or solvents to a drain.
Traps
Questions often place production pressure against a safety rule, or show someone 'quickly' reaching past a guard, defeating an interlock, or adjusting a belt with the machine energized. Another common trap is treating air-hose cleaning as acceptable - compressed air drives chips into eyes and skin and is generally prohibited for personal cleaning.
Rule of thumb and worked example
One lock, one person: you apply your own lock and keep the only key. Worked example: a chip is lodged in a bored hole. Correct sequence - stop the spindle, wait for rotation to stop, remove the chip with a brush or hook, then restart. Never with fingers, never with compressed air.