Siemens SINUMERIK 840D Programming Manual page 288

4
Turning Cycles
4.4 Undercut cycle – CYCLE94
Sequence of operations
Position reached prior to cycle start:
The starting position can be any position from which
the 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 tool nose radius compensation
according to active tool point direction and
traversal of undercut contour at feedrate
programmed prior to cycle call
• Retraction to the starting point with G0 and
deselection of the tool nose radius compensation
with G40
Description of parameters
SPD and SPL (starting point)
The finished part diameter for the undercut is
entered in parameter SPD. With parameter SPL you
define the finished part dimensions in the
longitudinal axis.
If the value programmed for SPD results in a final
diameter that is <3mm, the cycle is aborted with the
alarm 61601 "Finished part diameter too small".
is output.
4-288
X
SPL
SINUMERIK 840D/840Di/810D Programming Guide Cycles (PGZ) – 11.02 Edition
4
03.96
SPD
Z
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