For large volume production of metal products, containing fittings is advisable to use automatic lathes poluavtomatov.S their help is provided by an increase in the rate of production of parts and accuracy specifications of the products compared to manually processing workpieces on lathes stankah.Rezbonareznye work has been done with the dice, thread-heads, taps and cutters. Condition threading cutter requires kinematic dependence spindle speed of longitudinal feed reztsa.Na turning cam and a number of software to control (CNC) machines and semi-automatic kinematic schemes such dependence is not provided, so threading cutters can only be done when applying for these special extras and ustroystv.Dopolnitelnye devices are driven by gear, is placed on the rear end of the spindle, the movement from which a replacement guitar gear ring is transmitted to a special cam or screw, carrying out a longitudinal flow koretki Crusade supporta.Pri tapping is necessary that for one revolution of the spindle cutter shifted by an amount shaga.Taka as one operation by the tool in one revolution of the lead cam, the spindle speed is related to speed cam gear ratio, which is ensured by the selection of replacement wheels. Preservation of the equal and favorable conditions for cutting the left and right surfaces of the screw relative to the tool requires that face of tool coincides with the normal to each of the helical surfaces rezby.Eto a cut condition is met when the front face is inclined at an angle equal to the angle to create lift rezby.S on the tool back angle of the axis of the tool have higher axis workpiece when cutting threads and lower right – when cutting the left. These conditions provide a normal quality of thread-cutters work on automatic lathes and semiautomatic.