HEIDENHAIN iTNC 530 (340 49x-03) - Manual (Page 333)

HEIDENHAIN iTNC 530 333
8.3 Cy
cles f
o
r Dr
illing,
T
a
pping and Thr
ead Milling
CENTERING (Cycle 240)
1 The TNC positions the tool in the tool 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
Q201
Q206
Q210
Q203
Q204
Q344
Before programming, note the following:
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.
Enter in MP7441 bit 2 whether the TNC should output an
error message (bit 2=1) or not (bit 2=0) if a positive depth
is entered.
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!