STGR-20 Threading head

Threading heads are used for cutting internal and external threads directly on the lathe.

This method of thread cutting is much more productive than traditional thread forming with a cutter in 20 passes.

The threading process takes 3-5 seconds. The threading head is placed in the toolholder of the machine.

A longitudinal feed rate is set that exceeds the thread pitch.

Due to the axial displacement, the thread rollers converge to the workpiece axis and form the thread profile.

When the feed is stopped, the rollers move aside and the head is withdrawn from the machining area.

 Threading screwcutting heads are used for cutting external and internal threads on lathes, turret lathes and automatic lathes.

Radial, tangential and circular combs are used in screw threading heads (figure below).

At the end of thread cutting, the dies or combs automatically separate and do not come into contact with the thread on the return stroke.

For external thread cutting, heads with circular combs are more common,

as they are simple in design, allow for a large number of resharpenings and are more

durable than radial and tangential combs.

The design and operation of screwcutting heads have minor differences.