A turned component is a part made by spinning a bar of metal in a lathe and cutting it to shape with fixed tools. Pins, bushes, inserts, fittings and screws are typical turned parts.
Turning suits round parts. Flats, cross-holes and slots can be added on the same machine if it has live tooling, or in a second operation.
How a turned part is made
- Bar stock, usually 3 metres long, is loaded into the machine's bar feeder.
- The bar spins and is fed forward through a collet.
- Tools face, turn, drill, bore, groove and thread the part.
- A parting tool cuts the finished part off the bar.
- Parts are deburred, washed and sometimes tumbled.
- Secondary steps such as cross-drilling, knurling, heat treatment or plating follow if needed.
- Parts are inspected and packed.
The machines used
Jamnagar workshops use three main types of machine. The choice affects cost, accuracy and set-up time.
- Cam-type automatic lathes are fast and cheap to run for simple parts in high volume, but slow to set up and less precise.
- CNC lathes are programmed rather than cammed, so they change over quickly and hold tighter tolerances.
- Sliding-head lathes, often called Swiss-type, support the bar close to the cutting tool, which suits long, slender and very precise parts.
What to watch for
The machine type tells you a lot about what a supplier can achieve. Read what CNC and Traub machines are used in Jamnagar and what tolerances Jamnagar suppliers can hold before you compare quotes.
The main risks are dimension drift as tools wear, burrs left in threads and holes, and the wrong bar grade. A good supplier checks first-off parts after each set-up and measures samples during the run.
Turned, forged or cast
Turning from bar is the simplest route for small round parts. It needs no die or mould, so there is little up-front tooling, and a new part can be ready quickly. The trade-off is waste: a part with a large head and a thin body turns most of the bar into chips.
Brass chips are recycled, so the waste is not lost, but the bar is bought at full weight. For parts with a large outer shape, such as a valve body or a hexagon fitting, hot forging a blank and then machining it often uses less metal. Casting is used for large or hollow shapes that cannot be forged.
A good supplier will tell you which route suits your volume. If two quotes use different routes, compare the full cost, including any die or pattern, and not just the price per piece.
Next step
We find and audit manufacturers, check samples and supervise production. To check a turning shop before you place an order, book a free sourcing review.