Siemens SINUMERIK 840D Programming Manual page 240

Turning Cycles
4
4.6 Thread undercut – CYCLE96
Sequence of operations
Position reached prior to cycle start:
The starting position can be any position from which
any thread undercut can be approached without
collision.
The cycle implements the following motion
sequence:
• Approach to the starting point calculated in the
cycle with G0.
• Selection of the tool radius compensation for the
active tool point direction. Retraction along the
undercut contour at the feedrate programmed
before cycle call.
• Retraction to the starting point with G0 and
deselection of tool radius compensation with
G40.
Description of parameters
DIATH (nominal diameter)
With this cycle you can machine thread undercuts
for metrical ISO threads from M3 to M68.
If the value programmed in DIATH results in a final
diameter of <3 mm, the cycle is aborted and alarm
61601 "Finished part diameter too small" is output.
If the parameter is assigned a value other than that
defined by DIN76 Part 1, again the cycle is aborted
and the alarm
61001 "Thread pitch incorrectly defined" is output.
SPL (starting point)
With parameter SPL you define the final dimension
in the longitudinal axis.
4-240
X
SPL
SINUMERIK 840D/840Di/810D/FM-NC Programming Guide, Cycles (PGZ) - 04.00 Edition
03.96
4
Z
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