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Machine Safety Flashcards

7 cards from real CNC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Machine Safety flashcards as text

  1. What does a 'door interlock' on a CNC machining center prevent?

    Answer: The spindle from starting when the enclosure door is open

    Door interlocks electrically prevent spindle rotation and axis motion when the enclosure door is open, protecting the operator.

  2. A CNC operator is performing a dry run (no material) to verify a new program. What is the safest practice?

    Answer: Use single-block mode and reduced feed rate override

    Single-block mode lets the operator review each line of code step by step, and a reduced feed override provides time to react to unexpected motion.

  3. When cleaning chips from a CNC machine, which tool should NEVER be used?

    Answer: Compressed air blown directly at the work area without a guard

    Using unguarded compressed air to blow chips can propel sharp metallic chips at high velocity, creating a serious eye and skin hazard for nearby workers.

  4. Which of the following best describes the purpose of a CNC machine's soft limits?

    Answer: They are software boundaries that prevent axis travel beyond a safe range

    Soft limits are programmable boundaries set in the CNC controller that stop axis motion before it reaches hard mechanical stops or causes a crash.

  5. What is the hazard associated with running a CNC machine with the coolant system disabled during metal cutting?

    Answer: Excessive heat can cause tool failure, fire risk, and harmful metal fumes

    Without coolant, heat buildup can cause tool breakage, workpiece fire risk with certain alloys, and release of hazardous metal particles and fumes.

  6. An operator notices that a tool is showing signs of wear during a production run. What is the safest course of action?

    Answer: Stop the machine and replace the tool before continuing

    Running a worn tool increases the risk of sudden tool breakage, poor part quality, and potential injury from ejected tool fragments.

  7. What is the proper lockout/tagout (LOTO) procedure step immediately after isolating a CNC machine's energy source?

    Answer: Apply a personal lock and tag to the energy isolation point

    After isolating the energy source, the technician must attach a personal lock and tag to prevent anyone else from re-energizing the machine while work is performed.