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CNC G-Code and Programming Flashcards

6 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 6 CNC G-Code and Programming flashcards as text

  1. Which G-code command is used to set absolute positioning mode in CNC programming?

    Answer: G90

    G90 sets the machine to absolute positioning mode, where all coordinates are measured from the work origin.

  2. What does the M03 command do in a CNC cutting program?

    Answer: Starts the spindle clockwise

    M03 starts the spindle in the clockwise (CW) direction, which is the standard direction for most cutting tools.

  3. Which G-code is used to perform a circular interpolation in the clockwise direction?

    Answer: G02

    G02 commands the machine to move in a clockwise circular arc, defined by the center point (I, J, K) or radius (R).

  4. What is the function of the F-word in a CNC program block?

    Answer: Feed rate

    The F-word specifies the feed rate, which controls how fast the cutting tool moves through the material.

  5. Which G-code command cancels tool radius compensation in CNC programming?

    Answer: G40

    G40 cancels cutter radius compensation, returning the tool path to the programmed centerline.

  6. In a CNC program, what does the S-word specify?

    Answer: Spindle speed in RPM

    The S-word defines the spindle speed in revolutions per minute (RPM), which directly affects cutting performance.