Spiral tapping (milling) of threads with driven tools on a CMZ lathe. It is used when cutting special threads or threads in hard materials and when the thread is too large for the power and torque of the driven tools.
![Spiralno vrezovanje navojev s stružnico CMZ](http://estra.si/cdn/shop/articles/CMZ_spiralno_vrezovanje.jpg?v=1676277874&width=1100)
Spiral tapping (milling) of threads with driven tools on a CMZ lathe. It is used when cutting special threads or threads in hard materials and when the thread is too large for the power and torque of the driven tools.