Spiral thread tapper

The utility model discloses a spiral thread tapper uses in lathe tapping equipment field, including handle of a knife and cutter arbor, in the handle of a knife was cup jointed to cutter arbor one end, the other end was connected with the tool bit, and the handle of a knife has been seted up along the axial and has been screwed up the hole, and has seted up two centrosymmetric spiral slot holes, the cutter arbor can be adjusted in the handle of a knife and cup joint the degree of depth to on being fixed in the spiral slot hole through the screw I that matches with screw I with the cutter arbor, the tool bit is along radially having a turning handle through pivot swivelling joint, a plurality of not unidimensional quad slits are offered to the outer disc of turning handle, and the counter bore with every quad slit one -to -one is offered to the side, set up a screw II who matches with the counter bore on the tool bit to on being fixed in the tool bit through the screw II that matches with screw II with the tur