HEIDENHAIN TNC 620 (340 56x-03) Cycle programming - Manual (Page 80)

80 Fixed Cycles: Drilling
3.8 UNIVER
SAL PECKING (Cy
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DIN/ISO: G205, A
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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 advance stop distances Q258 not equal to 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!