Siemens SINUMERIK 808D ADVANCED Programming And Operating Manual page 158

If the cycle detects any of the tool point directions 5 ... 9, the alarm 61608 "Wrong tool point direction programmed" and the
cycle is aborted.
VARI=1...4: Definition of undercut position
For VARI<>0, the following applies:
● The actual cutting edge position is not checked, i.e., all positions can be used if technologically suitable.
The clearance angle of the active tool is monitored in the cycle if an appropriate value is specified in the appropriate
parameter of the tool compensation. If it turns out that the form of the undercut cannot be machined using the selected tool
since its tool clearance angle is too small, then the message "Changed form of undercut" is displayed on the control system.
The machining, however, is continued.
The cycle determines its starting point automatically. This is by 2 mm away from the end diameter and by 10 mm away from
the finishing dimension in the longitudinal axis. The position of this starting point referred to the programmed coordinate
values is determined by the tool point direction of the active tool.
Note
Before calling the cycle, a tool compensation must be activated; otherwise, the cycle is aborted after alarm 61000 "No tool
compensation active" has been output.
Programming and Operating Manual (Turning)
158
6FC5398-5DP10-0BA2, 06/2015