Siemens Sinumerik 802D sl Programming Manual page 98

Enhanced Level Commands
4.1 Program support functions (1)
Fig. 4-10
If chamfer size is "0" when the G78 (G92, G21) cycle is executed with chamfering
ON, an alarm occurs.
Straight facing cycle
Format
G... X... Z... F... ;
G code system A
With the commands of "G... X(U)... Z(W)... F... ;", straight facing cycle of 1 to 4 as
shown in Fig. 4-11 is executed.
Fig. 4-11
Since G79 (G94, G24) is a modal G code, thread cutting cycle is executed by sim-
ply specifying depth of cut in the Z-axis direction in the succeeding blocks. It is not
necessary to specify G79 (G94, G24) repeatedly in these blocks.
4-98
Thread cutting cycle path
when feed hold is not executed
C
Feed hold during thread cutting cycle
G code system B
G94
+X
A' 1
U
2 4
2
3
C
X
B W
2
Z
Straight facing cycle
SINUMERIK 802D sl/840D sl840D/840Di sl/840Di/810D ISO Turning -- 04.07 Edition
A
Start
point
Thread cut-
ting cycle
path when
feed hold
B
is executed
G79
Start point A
Rapid traverse
Feed designated by F code
+Z
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04.07
G code system C
G24