Process

In analogy to the section on chip breaking, when the final drilling depth is reached, a reversal of the 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 retraction plane. Reversal of the direction of rotation after reaching the thread depth is internal in the cycle. There are 2 methods for chip breaking and evacuation and they are selectable by using the appropriate parameters.

Chip breaking

In the 1st method @P31=1, the tapping drill is retracted after every infeed depth by a programmed distance @P61 to permit chip breaking. @P11 supplies the number of infeed operations.

Evacuating chips

In the 2nd method @P31=2, the tapping drill is retracted from the hole to the reference plane + safety clearance after every infeed depth to permit chip evacuation. @P11 supplies the number of infeed 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.