HEIDENHAIN SW 68894x-02 - Manual (Page 284)

284 Teach-in mode
4.6
Thr
ead
and
under
cut
cy
cles
Internal thread and thread undercut
The machining operation is to be performed in two steps. The thread
undercut DIN 76
produces the undercut and thread chamfer. In the
second step, the thread cycle cuts the thread.
First step
The parameters for the undercut and thread chamfer are programmed
in two superimposed input windows.
The CNC PILOT determines the undercut parameters from the
standard table.
For the thread chamfer, you only need to enter the chamfer width. The
angle of 45° is the default value for the 1st cut angle WB.
Tool data
 Turning tool (for internal machining)
 WO = 7 (tool orientation)
 A = 93° (tool angle)
 B = 55° (point angle)
Second step
The Thread cycle (longitudinal) cuts the thread. The thread pitch is
defined. The CNC PILOT automatically determines all other values
from the standard table.
You must pay attention to the setting of the Inner thread soft key.
Tool data
 Threading tool (for internal machining)
 WO = 7 (tool orientation)