HEIDENHAIN 548431-05, User Manual, Page: 340 / 722

Teach-in | Thread and undercut cycles
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HEIDENHAIN | MANUALplus 620 | User's Manual | 12/2017
Example of thread and undercut cycles
External thread and thread undercut
The machining operation consists of two steps. The Undercut DIN
76
cycle machines the undercut and thread chamfer. The thread
cycle then cuts the thread.
1st step
The parameters for the undercut and thread chamfer can be
programmed in two superimposed input windows.
Tool data:
Turning tool (for external machining)
TO = 1 – Tool orientation
A = 93° – Tool angle
B
= 55° – Point angle
2nd step
The thread cycle (longitudinal)—expanded cuts the thread. The
cycle parameters define the thread depth and the proportioning of
cuts.
Tool data:
Turning tool (for external machining)
TO
= 1 – Tool orientation