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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. Which of the following is a recognized cause of CNC workpiece ejection during milling?

    Answer: Insufficient clamping force for the cutting forces generated

    If cutting forces exceed the clamping force, the workpiece can be pulled loose from the fixture and ejected at high speed.

  2. Why should a CNC operator never reach into the machining envelope while the spindle is still decelerating?

    Answer: The spindle can still cause cutting injuries until it reaches a full stop

    A decelerating spindle still rotates fast enough to cause severe lacerations — entry into the envelope must wait until a full stop is confirmed.

  3. When is it appropriate to override a CNC machine's safety interlock?

    Answer: During a supervised maintenance procedure with proper LOTO in place

    Safety interlocks may be temporarily bypassed only during authorized maintenance with lockout/tagout controls applied to manage the hazard.

  4. What is the primary risk of machining without first reviewing the toolpath simulation in the CAM software?

    Answer: Undetected tool collisions with the fixture or machine components can occur

    Toolpath simulation catches programmed collisions between the tool, holder, fixture, and machine components before a costly or dangerous crash occurs.

  5. Which hazard is specific to machining magnesium alloys on a CNC mill?

    Answer: Fine chips and dust that can ignite or combust spontaneously

    Magnesium chips and fine dust are highly flammable and can ignite, making fire prevention and the use of a Class D extinguisher critical.

  6. A CNC machine's axis drive faults during a cutting pass. What is the operator's first action?

    Answer: Press the E-stop and wait for the spindle to fully stop before investigating

    An axis fault during a cut could mean a crash or mechanical failure; hitting E-stop stops all motion safely before any assessment is done.

  7. What does the OSHA Hazard Communication Standard require operators to have access to for cutting fluids used in CNC operations?

    Answer: Safety Data Sheets (SDS) detailing composition and first-aid measures

    OSHA's HazCom standard (29 CFR 1910.1200) requires that Safety Data Sheets for all hazardous chemicals, including cutting fluids, be readily accessible to workers.