The Emuge Punch Tap – technology, also called helical cold-forming of threads, constitutes the fourth method for the production of internal threads besides tapping, cold-forming of threads and thread milling. This patented method was developed in cooperation between Audi AG and EMUGE-FRANKEN and presented for the first time to the public in 2014.
Thanks to entirely new kinematics with a significantly shorter tool path, the Punch Tap allows for time savings of up to 75% compared to conventional cold-forming of taps.
To enable this movement path, the tool does not have a continuous thread profile on the circumference, but features two rows of flutes. These flutes are off-set by 180° and extend in a helical curve all the way down to the usable application depth.