HEIDENHAIN SW 548328-05 - Manual (Page 299)

HEIDENHAIN MANUALplus 620 299
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.
The parameters 1st hole depth P and hole depth reduction value
IB
define the individual passes, and the minimum hole depth JB limits
the hole reduction value.
As the return 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
 WO = 8 (tool orientation)
 I = 12 (drilling diameter)
 B = 118 (point angle)
 H = 1 (the tool is a driven tool)