The X axis is a 2-axis CNC milling machine that works with the Y axis to perform 3D rotational machining. The X axis is usually powered by a computer or by hand controls
The Y axis is used to rotate the part around its vertical axis, which can be controlled manually or by computer. The Y axis can also move in two dimensions (X and Z), but most of the time it's used only for rotation
In general, a CNC milling machine has three axes: X, Y, and Z. It also has a fourth axis, which is typically called Z2 or Z3. This fourth axis moves along with the other three but it does not have any rotational motion; it's just there for support and balance purposes.
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