Threading is the operation by which it is possible to obtain helical grooves along the longitudinal direction of a piece. It can be internal or external generating male or female pieces. It can be obtained by different mechanical processes through the swarf removal:
Most turning operations use the lathe although thread turning is a demanding operation in which it is difficult to obtain good swarf control, and constant characteristics.
In addition to these classic threading operations, Antoniana Minuterie has industrialized an automatic threading process covered by industrial secret.