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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. When performing a lockout/tagout (LOTO) procedure on a CNC machine, what is the correct sequence of steps?

    Answer: Notify affected employees, shut down equipment, isolate energy sources, apply locks

    LOTO requires notifying affected employees first, then shutting down and isolating all energy sources before applying locks and tags.

  2. Which type of fire extinguisher is appropriate for a CNC machine electrical fire?

    Answer: Class C

    Class C extinguishers are designed for electrical fires and use non-conductive agents that won't create shock hazards.

  3. What is the primary hazard associated with a worn or damaged CNC machine way cover?

    Answer: Chip and coolant intrusion damaging linear guides and ball screws

    Damaged way covers allow chips and coolant to contact and abrade the precision linear guides and ball screws, causing premature wear.

  4. Under OSHA 29 CFR 1910.217, point-of-operation guarding on CNC machining centers must prevent the operator from reaching into the:

    Answer: Danger zone during the hazardous portion of the machine cycle

    Point-of-operation guards must physically prevent operator contact with the danger zone during any hazardous part of the machine cycle.

  5. A CNC operator notices hydraulic fluid pooling beneath the machine. The correct immediate action is to:

    Answer: Stop the machine, place absorbent material, and tag out the machine for maintenance

    Hydraulic leaks create slip hazards and indicate potential system failure; the machine must be stopped and tagged out for repair.

  6. What is the recommended method for removing chips from a CNC machine's work envelope?

    Answer: Chip hook or brush with machine in a safe state

    Chip hooks and brushes protect hands from sharp edges, and the machine must be in a safe, non-operating state before chip removal.

  7. How often should CNC spindle bearing preload and runout typically be verified as part of preventive maintenance?

    Answer: Per manufacturer's schedule, commonly every 1,000–2,000 operating hours

    Manufacturer-specified intervals (often 1,000–2,000 hours) ensure bearing condition is caught before it causes dimensional errors or catastrophic failure.