Siemens Sinumerik 802D sl Programming Manual page 103

04.07
P: Starting block of contour definition
Q: Ending block of contour definition
U: Finishing allowance in X direction ( Δu) (diameter/radius designation)
W: Finishing allowance in Z direction ( Δw)
F: Machining feed
S: Spindle speed
T: Tool selection
F, S, or T functions issued within the NC program block range specified by address
P and Q will be ignored. The relevant F, S, or T functions specified in the G71 block
are effective.
Note
1. Both Δd and Δu are specified by means of the address U. If the addresses P
and Q are present, then Δu is the case.
2. Four cutting sectors are possible. The relevant signs of Δu and Δw vary as
shown in the figure below:
Fig. 4-16
Within the block specified by address P, the contour between points A and A' is
determined (G00 or G01). A move command in the Z axis cannot be specified in
this block.
The contour defined between A' and B must represent a steadily increasing or
decreasing pattern in both X and Z axis.
3. Within the range of NC blocks specified by address P and Q, subprograms can-
not be called.
© SIEMENS AG 2007 All rights reserved
SINUMERIK 802D sl/840D sl840D/840Di sl/840Di/810D ISO Turning -- 04.07 Edition
+X
+Z
B A
U(+)...W(+)
A'
A'
U(--)...W(+)
A
B
Enhanced Level Commands
4.1 Program support functions (1)
B
A
U(+)...W(--)
A'
A'
U(--)...W(--)
A
B
4-103