Refer to your machine manual.
Machine and control must be specially prepared by the machine manufacturer for use of this cycle.

The control can control the main machine tool spindle and rotate it to a given angular position.
Oriented spindle stops are required for purposes such as:
- Tool changing systems with a defined tool change position
- Orientation of the transmitter/receiver window of HEIDENHAIN 3-D touch probes with infrared transmission
With M19 or M20, the control positions the spindle at the angle of orientation defined in the cycle (depending on the machine).
If you program M19 or M20 without having defined Cycle 13 beforehand, the control positions the main spindle at an angle that has been set by the machine tool builder.