Process

In analogy to the section on chip breaking, when the final drilling depth is reached, a reversal in rotational direction takes place. After reversal of the direction of rotation, the tool is retracted at the same speed and feedrate out of the tapped hole and moved to the specified return plane. Reversal of the direction of rotation after reaching the thread depth is internal in the cycle. There are 2 methods which are selected by the appropriate parameters:

1. Chip breaking: In the 1st method @P52=1, the tapping drill is retracted after every feed depth by a programmed distance @P79 to permit chip breaking. @P30 supplies the number of feed operations.
2. Chip evacuation In the 2nd method @P52=2, the tapping drill is retracted from the hole to the reference plane + safety clearance after every feed depth to permit chip evacuation. @P30 supplies the number of feed operations.

Notice

For use of the thread tapping and milling cycle without compensation chuck, it is technologically necessary for the spindle to be operated as a position-controlled spindle since it is positioned internally in the cycle before thread tapping and is operated as a path axis.