HEIDENHAIN iTNC 530 (340 420) ISO programming - Manual (Page 259)

HEIDENHAIN iTNC 530 259
8.3 Cy
cles f
o
r Dr
illing, T
a
pping and Thr
ead Milling
9 At the end of the cycle, the TNC retracts the tool at rapid traverse
to the set-up clearance, or—if programmed—to the 2nd set-up
clearance.
Before programming, note the following:
Program a positioning block for the starting point (hole
center) in the working plane with radius compensation
G40.
The algebraic sign of the cycle parameters depth of thread
or sinking depth at front determines the working direction.
The working direction is defined in the following
sequence:
1st: Depth of thread
2nd: Depth at front
If you program a depth parameter to be 0, the TNC does
not execute that step.
The type of milling (up-cut/climb) is determined by the
thread (right-hand/left-hand) and the direction of tool
rotation, since it is only possible to work in the direction of
the tool.
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 depth is entered. This
means that the tool moves at rapid traverse in the tool axis
at safety clearance below the workpiece surface!