HEIDENHAIN TNC 620 (340 56x-01) - Manual (Page 225)

HEIDENHAIN TNC 620 225
8.2 Cy
cles f
o
r Dr
illing, T
apping and Thr
ead Milling
CENTERING (Cycle 240, Advanced programming
features software option)
1 The TNC positions the tool in the spindle axis at rapid traverse FMAX
to the set-up 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 path is retraced to set-up clearance or—if
programmed—to the 2nd set-up clearance at rapid traverse FMAX.
X
Z
Q200
Q344
Q206
Q210
Q203
Q204
Q201
30
X
Y
20
80
50
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.
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 diameter or depth is
entered. This means that the tool moves at rapid traverse
in the tool axis at safety clearance below the workpiece
surface!