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Machine 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 flashcards as text

  1. What is the function of a through-spindle coolant (TSC) system on a CNC machining center?

    Answer: To deliver coolant directly through the tool to the cutting edge

    TSC channels high-pressure coolant through the spindle and tool body to the cutting zone, improving chip evacuation and heat removal in deep-hole or difficult-to-reach areas.

  2. On a CNC machine, what does 'G28' command the machine to do?

    Answer: Return all axes to the machine home (reference) position

    G28 is the return-to-reference-point command that moves all programmed axes to the machine's home (zero) position.

  3. What is the purpose of a CNC machine's pallet changer?

    Answer: To allow one pallet to be loaded/unloaded while another is being machined

    A pallet changer improves machine utilization by letting an operator set up the next workpiece on one pallet while the machine cuts the current one.

  4. Which axis is typically defined as the axis of rotation of the main spindle in CNC programming standards?

    Answer: Z-axis

    By EIA/ISO convention, the Z-axis is always parallel to the principal spindle axis of rotation in CNC machine tool programming.

  5. What causes 'stick-slip' in older CNC machine slideways, and how is it typically corrected?

    Answer: Insufficient lubrication causing jerky motion at low feeds; corrected with proper way oil

    Stick-slip occurs when dry or poorly lubricated slideways alternate between static and kinetic friction, causing jerky motion especially at slow feed rates.

  6. In a CNC machining center, what does the term 'spindle orientation' (M19) accomplish?

    Answer: Locks the spindle at a specific angular position for tool changes or boring bar indexing

    M19 stops and orients the spindle to a defined angular position, which is required for automatic tool changes or precise tool insertion into a boring bar.

  7. What machine feature is 'look-ahead' processing in a CNC controller designed to optimize?

    Answer: Velocity and acceleration as the machine approaches corners or direction changes

    Look-ahead reads multiple blocks ahead in the program so the controller can smoothly decelerate and accelerate around corners without overshooting or losing accuracy.