CNC turning
Shafts, bushes, fittings and pins, turned in audited shops in our Bursa network, from prototypes to series. Send STEP and a PDF drawing; we come back with a route, a price and a lead time.
| Process | CNC turning |
|---|---|
| Materials | Steel, stainless, brass, aluminium |
| General tolerance | ISO 2768-m |
| Documents | EN 10204 3.1, FAI, measurement report |
| Contact | sales@ertas.engineering |
When turning is the right choice
Turning suits parts that are round around one axis: shafts, bushes, fittings, pins, spacers. Diameters, shoulders, grooves, threads and bores are all cut while the part spins.
Flats, keyways and cross holes need a milling operation after turning. Parts that are mostly faces and pockets are cheaper milled. If your part is a mix, we route it and tell you why.
| Part shape | Turning | Milling | Sheet metal |
|---|---|---|---|
| Round shaft or bush | First choice | Flats, cross holes | No |
| Round part with flats or keyways | Turned first | Second operation | No |
| Block with pockets and holes | Rarely | First choice | No |
Design rules that cut cost
- Add thread run-outs and undercutsA thread or a ground seat that ends at a shoulder needs a relief groove. Without it the tool cannot finish the last turns.
- Keep slender parts stiffLong, thin shafts deflect under the tool. A steadier length-to-diameter ratio, or a centre bore at the end, keeps the diameter true.
- Use standard threads and radiiMetric threads and common corner radii use inserts the shop already has. Special profiles need special tools.
- Tolerance only functional diametersBearing seats and sealing diameters get their own tolerance or fit. Everything else stays on ISO 2768-m.
- Group milled featuresFlats, keyways and cross holes cost a second clamping. Put them on as few sides as you can.
Materials
Grades we turn through the network. Anything else, ask: we confirm before you order.
| Group | Grades | Notes |
|---|---|---|
| Carbon and alloy steel | C45, 42CrMo4 | Powder coating available. Zinc plating |
| Stainless steel | 1.4301, 1.4404 | Passivation |
| Brass and copper | On request | Send the alloy with the drawing. |
| Aluminium | EN AW-6061, 6082, 7075 | Anodizing available. Hard anodizing |
| Plastics | On request | Send the grade with the drawing. |
General tolerance ISO 2768-m; tighter tolerances per drawing, confirmed with you before the order.
What you receive
| Item | What it is | When |
|---|---|---|
| Quote | Process route, price, lead time | After STEP + PDF |
| Turned parts | Made to your drawing | With order |
| Material certificate | EN 10204 3.1 | On request |
| First article | FAI report | On request |
| Measurement | Measurement report | On request |
| Conformity | Certificate of conformity | On request |