What is the difference between 3-axis, 4-axis and 5-axis in CNC? What is suitable for machining

3/24/2025

Parameter Dimension	3 Axis CNC	4 Axis CNC	5 Axis CNC
Axis Definition	- 3 linear axes: X, Y, Z - The tool moves in a straight line, machining a single plane in a single pass.	- 3 linear axes + 1 rotary axis (e.g. A-axis) - Linear and rotary axes are linked to machine multi-angle planes.	- 3 linear axes + 2 rotary axes (e.g. A/B or B/C) - 5-axis linkage, tool can cut into workpiece from any angle
Accuracy	- Low (±0.05mm class) - Multiple clamping error prone	- Medium (±0.02mm class) - Reduced number of clamping times improves accuracy	- Highest (±0.005mm class, micron class) - Linkage processing avoids interference, resulting in high precision
Machining efficiency	- Low - Complex parts require multiple clamping and turning	- Medium-high - Multi-face machining in one clamping, 30%-50% increase in efficiency.	- Highest - Complete the whole process in one setup, 20%-40% more efficient than 4-axis.
Machining types	- Surface milling, drilling, simple 2D/2.5D parts - Regular surfaces (e.g. cylindrical surfaces)	- Multi-surface machining, cylinder side profile - Moderately complex surfaces (e.g., convex molds for automotive molds)	- Complex free-form surfaces (e.g., impellers, propellers) - Inverted features, multi-curvature transition parts

¨NBSP;

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