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Safety Standards & Maintenance Practices 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 Safety Standards & Maintenance Practices flashcards as text

  1. Which ANSI standard governs safety requirements for machining centers and automatic tool-change systems?

    Answer: ANSI B11.8

    ANSI B11.8 specifically addresses safety requirements for drilling, milling, and boring machines, including machining centers with ATC systems.

  2. A CNC machine's axis drive produces unusual grinding noise during rapid traverse. The most likely cause and correct action is:

    Answer: Ball screw or linear guide degradation; stop and schedule maintenance

    Grinding during rapid traverse typically indicates ball screw or linear guide wear, requiring immediate maintenance to prevent catastrophic axis failure.

  3. When should a CNC operator perform a machine home (reference) position check?

    Answer: At the start of each shift and after any emergency stop or collision

    Reference position must be verified at shift start and after any event that could shift encoder or limit switch calibration, such as E-stops or collisions.

  4. What is the correct disposal method for used CNC cutting fluid (coolant) containing metal fines?

    Answer: Follow EPA and local regulations for industrial waste disposal

    Used metalworking fluid with metal fines is a regulated industrial waste requiring disposal per EPA 40 CFR Part 262 and applicable local environmental regulations.

  5. The purpose of a CNC machine's overtravel limit switch is to:

    Answer: Stop axis movement before a mechanical crash into end-of-travel

    Overtravel limit switches are hard-wired safety devices that cut axis drive power to prevent the machine from driving a carriage into its mechanical end stop.

  6. Skin contact with water-soluble CNC coolant over extended periods can cause:

    Answer: Dermatitis or occupational skin disease

    Prolonged or repeated skin exposure to metalworking fluids can cause contact dermatitis; operators should use appropriate barrier creams and PPE.

  7. When verifying a new CNC program for the first time, what is the safest initial method?

    Answer: Run a dry cycle (air cut) at reduced feedrate with the spindle locked or workpiece removed

    A dry-run air cut at reduced feedrate allows verification of tool paths without risk of collision, crash, or scrapped workpiece before actual production.