HEIDENHAIN TNC 620 (340 56x-02) Cycle programming - Manual (Page 59)

HEIDENHAIN TNC 620 59
3.2 CENTERING (Cy
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G240, A
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3.2 CENTERING (Cycle 240,
DIN/ISO: G240, Advanced
Programming Features
Software Option)
Cycle run
1 The TNC positions the tool in the spindle axis at rapid traverse
FMAX to the setup clearance above the workpiece surface.
2 The tool is centered at the programmed feed rate F to the entered
centering diameter or centering depth.
3 If defined, the tool remains at the centering depth.
4 Finally, the tool moves to setup clearance or—if programmed—to
the 2nd setup clearance at rapid traverse FMAX.
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 Q344 (diameter)
or Q201 (depth) determines the working direction. If you
program the diameter or depth = 0, the cycle will not be
executed.
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 diameter or depth is
entered. This means that the tool moves at rapid traverse
in the tool axis to setup clearance below the workpiece
surface!