HEIDENHAIN TNC 620 (340 56x-02) Cycle programming - Manual (Page 147)

HEIDENHAIN TNC 620 147
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Please note while programming:
Pre-position the tool in the machining plane to the starting
position with radius compensation R0. Note Parameter
Q367 (stud position).
The TNC automatically pre-positions the tool in the tool
axis. Note Parameter Q204 (2nd setup clearance).
The algebraic sign for the cycle parameter DEPTH
determines the working direction. If you program
DEPTH = 0, the cycle will not be executed.
At the end, the TNC positions the tool back to the setup
clearance, or to the 2nd setup clearance if one was
programmed.
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 setup clearance below the workpiece surface!
Leave enough room next to the stud for the approach
motion. Minimum: tool diameter + 2 mm