Do I need a 5-axis machine, or will 3-axis do?
Most parts are fine on 3-axis. Five axes pay off for many-sided parts and complex curved surfaces.
Start here
Most parts can be made on a 3-axis machine. A 5-axis machine earns its place when parts need many sides machined, steep angles or complex curved surfaces.
What the extra axes add
A 5-axis machine adds two rotary axes to X, Y and Z. They tilt and turn the part or the spindle, so the tool can reach more faces without re-clamping.
3-axis is usually enough when
- Features are mostly on one or two faces
- You can flip the part in a vise between operations
- Batches are small and setup time isn’t the bottleneck
- You are still learning CAM and fixturing
5-axis pays off when
- Parts need work on many faces and every re-clamp costs accuracy
- Shapes include impellers, blades or sculpted surfaces
- Shorter tools at an angle would give a better finish
The middle ground
A 4th-axis rotary on a 3-axis mill, or 3+2 positioning, covers a lot of multi-sided work at lower cost and complexity than full simultaneous motion.
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