HEIDENHAIN TNC 128 (77184x-01) - Manual (Page 406)

406 Drilling, boring and thread cycles
16.8 UNIVER
SAL PECKING (Cy
c
le
205)
Please note while programming:
Program a positioning block for the starting point (hole
center) in the working plane with radius compensation R0.
The algebraic sign for the cycle parameter DEPTH
determines the working direction. If you program
DEPTH=0, the cycle will not be executed.
If you enter different advance stop distances for Q258 and
Q259
, the TNC will change the advance stop distances
between the first and last plunging depths at the same
rate.
If you use Q379 to enter a deepened starting point, the TNC
merely changes the starting point of the infeed
movement. Retraction movements are not changed by
the TNC, therefore they are calculated with respect to the
coordinate of the workpiece surface.
Danger of collision!
Use the machine parameter displayDepthErr to define
whether, if a positive depth is entered, the TNC should
output an error message (on) or not (off).
Keep in mind that the TNC reverses the calculation for pre-
positioning when a positive depth is entered. This
means that the tool moves at rapid traverse in the tool axis
to set-up clearance below the workpiece surface!