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In milling, the depth of cut is two-dimensional. The Axial depth of cut (AP or ADOC), is the length that the tool engages a workpiece in its axis direction as it moves perpendicular to it. Other terms that have the same meaning are Stepdown and Cut Depth.

The maximum possible ap is related to the tool’s diameter and is sometimes measured in diameter multiples. For example, a 3D 1/2″ endmill can cut at a depth of cut of up to 1.5″.

( The Axial Depth of Cut is closely related to the radial depth of cut. In most cases, you need to consider both when making decisions. Learn More in our In-Depth Depth of Cut guide.

Stepdown, Cut Depth
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