HEIDENHAIN SW 548328-05 - Manual (Page 281)

HEIDENHAIN MANUALplus 620 281
4.6 Thr
ead and under
c
ut 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 MANUALplus 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 MANUALplus 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)