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In 3-axis CNC machines, which axis is additional to the X and Z axes?

  1. A axis

  2. B axis

  3. Y axis

  4. C axis

The correct answer is: Y axis

In a 3-axis CNC machine, the third axis that is additional to the X and Z axes is the Y axis. The X, Y, and Z axes represent the three-dimensional Cartesian coordinate system in which the machine can move. The X and Y axes typically define horizontal movement, while the Z axis manages vertical movement. In this context, the inclusion of the Y axis completes the set for a 3-axis machine, allowing for movement in all three dimensions: left/right (X), back/forth (Y), and up/down (Z). Understanding this foundational setup is crucial for programming and operating CNC machines effectively. The A, B, and C axes refer to rotational axes or additional dimensional capabilities in more complex setups, such as in 4-axis or 5-axis CNC machines, which enable more intricate machining processes. However, for basic 3-axis systems, the Y axis is the correct answer that signifies the additional axis alongside X and Z.