HEIDENHAIN SW 68894x-03 - Manual (Page 316)

316 Teach-in mode
4.7 Dr
illing cy
cles
Deep-hole drilling
A hole is to be bored through the workpiece outside the turning center
with the cycle Deep-hole drilling, axial. This machining operation
requires a traversable spindle and driven tools.
1st hole depth P and the depth reduction value IB define the
individual passes, and the minimum hole depth JB limits the hole
reduction value.
As the retraction length B is not defined, the drill therefore retracts
to the starting point after each pass, remains there for the
programmed dwell time, and then advances again to the safety
clearance for the next pass.
Since this example is to illustrate how you drill a through hole, the hole
end point Z2
is programmed such that the tool has to drill all the way
through the workpiece before it reaches the end point.
The parameters "AB" and "V" define a feed reduction for both pre-
drilling and through-boring.
Tool data
 TO = 8 (tool orientation)
 I = 12 (drilling diameter)
 B = 118 (point angle)
 H = 1 (the tool is a driven tool)