Practice Test GeeksCNC - Cutting Practice Test
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Basics 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.

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  1. What does the term 'feed rate' refer to in CNC cutting?

    Answer: The rate at which the cutting tool advances into the workpiece

    Feed rate is the speed at which the cutting tool moves relative to the workpiece, typically expressed in inches per minute (IPM) or millimeters per minute.

  2. 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 origin (work zero).

  3. What is the purpose of a coolant in CNC cutting operations?

    Answer: To reduce heat, lubricate the cut, and flush away chips

    Coolant simultaneously reduces cutting heat, lubricates the tool-workpiece interface, and evacuates chips from the cutting zone.

  4. What is 'climb milling' in CNC machining?

    Answer: The cutter rotates in the same direction as the feed

    In climb milling, the cutter rotates in the same direction as the workpiece feed, which tends to produce a better surface finish and longer tool life.

  5. What unit is spindle speed (RPM) typically calculated from when setting up a CNC cut?

    Answer: Cutting speed (SFM or m/min) and tool diameter

    RPM is derived from the recommended cutting speed (surface feet per minute) and the tool diameter using the formula RPM = (CS × 12) / (π × D).

  6. In G-code, what does the M03 command do?

    Answer: Starts the spindle clockwise

    M03 starts the spindle in the clockwise (forward) direction and is paired with an S word to set the speed.

  7. What is 'depth of cut' (DOC) in CNC milling?

    Answer: How deep the tool engages the workpiece in the axial direction

    Depth of cut (axial DOC) is the measurement of how far the cutter plunges into the workpiece along the spindle axis per pass.