HEIDENHAIN TNC 620 (340 56x-02) Cycle programming - Manual (Page 111)

HEIDENHAIN TNC 620 111
4.8 THREAD DRILLING/MILLING (Cy
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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 of the cycle parameters depth of thread,
countersinking depth or sinking depth at front determines
the working direction. The working direction is defined in
the following sequence:
1st: Depth of thread
2nd: Total hole depth
3rd: Depth at front
If you program a depth parameter to be 0, the TNC does
not execute that step.
Program the thread depth as a value smaller than the total
hole depth by at least one-third the thread pitch.
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!