A device for tapping within die comprising a power guide means, a transmission means and a tapping means in which the power guide means can transmit power from horizontal displacement of a rack via a gear train in the transmission means to drive a rotating spiral gear to rotate and consequently cause a tapping unit in the tapping means to rotate and displace axially upon action of a guide spiral sleeve and a resistance element, and to tap by overcoming frictional resistance of the resistance element that permits the guide spiral sleeve to rotate freely so that pitch can be adjusted automatically for tapping in different pitches.
A servo motor driven tapping unit for in die installation has a tap holder pitch adapter assembly mounted for removal while the unit is in the die to facilitate tap and pitch adapter replacement. In one embodiment, the tap holder pitch adapter assembly extends transversely to the servo motor axis, and is offset in another embodiment.
