As easy alloys have smaller hardness, than a steel, the carving is cut in them easier. Cutting of a new carving occurs in three stages. Accordingly резьбонарезающий the tool: a draught tap (one ring on a core), an intermediate tap (two rings on a core), a fair tap (without or three rings on a core).

These three taps alternately at constant giving of oil are rolled and turned out from preliminary drilled aperture.