HEIDENHAIN TNC 320 (340 551-02) - Manual (Page 222)

222 8 Programming: Cycles
8.2 Cy
cles f
o
r Dr
illing,
T
a
pping and Thr
ead Milling
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).
Danger of collision!
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
at safety clearance below the workpiece surface!