cnc turning vs cnc milling
CNC Turning vs CNC Milling — Which Route Fits the Part
The choice is not a preference and it is not a price comparison — it is a consequence of the shape. A part that is round around one axis is a turning job; a part whose features sit on several flat faces is a milling job. Parts that are both need either a mill-turn machine or two operations, and that is where the price difference actually comes from.
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- Turning
- Round parts from bar; part rotates, tool is fixed
- Milling
- Shaped parts from plate; tool rotates, part is fixed
- Crossover
- Round with cross-features → mill-turn or two operations
- Cost rule
- The process is decided by the geometry, not the material
Most buyers do not need to choose the process — they need to know which one their part implies, because that is what explains the quote and what makes a design change negotiable.
Specifications
| Turning holds | ±0.01 mm diameter, high concentricity, fine OD finish |
|---|---|
| Milling holds | ±0.02 mm profile, ±0.01 mm bored feature, position |
| Crossover route | Turn then mill, or mill-turn in one setup |
| Materials (both) | Aluminium, stainless, carbon steel, brass, copper, titanium, plastics |
| MOQ | From 50 pieces (samples from 1) |
| Quote | 24 hours with DFM feedback |
Frequently asked questions
What is the main difference between CNC turning and CNC milling?
In turning the part rotates and the tool is fixed, producing round parts from bar. In milling the tool rotates and the part is fixed, producing shaped parts with flats, pockets and positioned holes from plate.
Can a turned part have holes in it?
Yes — an axial hole on the centreline is routine on a lathe, and a cross hole is done either on a lathe with live tooling or as a second milling operation. The second case is a crossover part and is quoted as two operations.
Which is cheaper, turning or milling?
For the same envelope, turning is usually cheaper because the cut is continuous and the setup is one operation. Milling becomes competitive when the part is a plate or needs features on several faces.
How tight a tolerance can each hold?
Turning holds ±0.01 mm on diameter routinely, and ±0.005 mm with grinding. Milling holds ±0.02 mm on a profile and ±0.01 mm on a bored feature. Position tolerance in milling is usually ±0.05 mm unless specifically tightened.
What is a mill-turn machine for?
It does both operations in one setup, which removes the second fixturing and the concentricity error that comes with re-chucking. It is the right route for a crossover part that also has a tight coaxial requirement.
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