CNC machined parts- TURNING PLAIN BARS BETWEEN CENTRES
The most basic way of holding work for turning is between centres. Turning be- tween centres is literally holding the component to be machined between two cen- tres, each of which has a 60-degree included angle. The headstock centre usually goes round with the headstock mandrel, although some older lathes had a non- rotating centre and the drive to the work was by a pulley mounted on the work. The tailstock centre is often a fixed centre that does not go round, although centres
with ball bearings, called running centres, are readily available.
The component to be turned, usually a shaft, has a female 60-degree centre in both ends that is used to support the work. The work can be turned round between centres so that both ends of the shaft can be machined. Because the work is mounted between centres, both ends of the work will be true to each other.
