HEIDENHAIN TNC 410 ISO Programming - Manual (Page 243)

HEIDENHAIN TNC 410, TNC 426, TNC 430 217
8.3 Cy
cles f
o
r Dr
illing
, T
a
p
p
ing
and
Th
read Millin
g 12 At the end of the cycle, the TNC retracts the tool in rapid traverse
to 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,
countersinking depth or sinking depth at front determines
the working direction. The working direction is defined in
the following sequence:
1st: Depth of thread
2nd: Total hole depth
3rd: Depth at front
If you program a depth parameter to be 0, the TNC does
not execute that step.
Program the thread depth as a value smaller than the total
hole depth by at least one-third the thread pitch.