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CNC Milling – 2D, 3D, 5-axis milling

Written By Ashish Kumar S

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November 10, 2025

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What is 2D, 3D and 5-axis Milling
2D milling (also called 2.5 D milling): 1. The tool axis is constant during an operation. 2. The tool moves into the material along the Z axis axis, then mills a plane in X-Y. 3. The tool motion is along 1 or 2 axes simultaneously.
Video source: http://www.iscar.com
With a right angle head, the infeed axis may be X or Y instead of Z, and the plane in the other two axes.
3D milling 1. The tool axis is constant during an operation, always Z. 2. The tool moves simultaneously in all 3 axes to mill 3D surfaces.
5-axis milling 1. The tool axis is NOT constant along Z, keeps changing. 2. The tool moves simultaneously in 3 linear axes and 2 rotary axes to mill surfaces.

Author

Ashish Kumar S

cadem
Ashish brings strong techno-commercial depth across CNC productivity solutions, CAD/CAM systems, and skill development initiatives. As the face of CADEM’s CNC ecosystem, he drives solution adoption and market growth by aligning advanced manufacturing software with real-world production challenges. A passionate advocate of CNC education in India, he actively engages with customers and students to bridge the gap between industry needs and workforce readiness.
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