Machining rotating parts...

Turning is the machining of rotating parts with automatic lathes that run through cam systems (traditional bar turning) or numerical controls (NC bar turning).
This form of machining uses metal bars, usually with a diameter close to the outside diameter of the finished product.
It is also possible to machine extruded bars, the most common example being a hexagonal bar to make hex nuts.

The removal of material is effected with the aid of carbide or high-speed steel tools. Of course, during the turning there is a constant feed of cutting oil to cool and lubricate the tools.

... with turning machines

Originally, bar turning was about working small turned components, screws and bolts in particular.

As a result of changes in the methods of metalworking and large scale production applications, turning has become an important branch of mechanics and machining shoe aim is to produce large runs of identically turned parts, machined from cylindrical or extruded-shaped bars, to a most advanced degree of completion.

Many manufacturers have developed increasingly sophisticated machinery: moving from semi-automatic to fully automated machines. This has been done for a better return, namely in terms of :

  1. High precision
  2. Large volumes
  3. Reduction in manufacturing costs.

These machines are often referred to as automatic lathes or simply turning machines..

Did you know ?

France is the world leader in bar turning, with a total of 905 French companies employing 19,000 employees and with a turnover in excess of 2 billion euros business. 65% of these businesses are located in Haute-Savoie, more specifically in the Arve valley and around Cluses.

Many of the most common everyday items are made using bar turning, such as screws, bolts, pins, watch arbors, pistons, gears, bicycle wheel axles ... are components manufactured exclusively by turning.