Siemens Sinumerik 802D sl Programming Manual page 107

04.07
G73 P... Q... U... W F... S... T... ;
P: Starting block of contour definition
Q: Ending block of contour definition
U: Finishing allowance in X axis direction (Δu) (diameter/radius designation)
W: Finishing allowance in Z axic 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 ad-
dress P and Q will be ignored. The relevant F, S, or T functions specified in the
G73 block are effective.
Note
1. The values Δi and Δk, or Δu and Δw are determined by address U and W re-
spectively. However, their meanings are specified by the appearance of addres-
ses P and Q present in the G73 block. Addresses U and W refer to Δi and Δk
respectively whenever P and Q are not specified in the same block. Addreses U
and W refer to Δu and Δw respectively whenever P and Q are specified in the
same block.
2. Four cutting sectors are possible. The relevant signs of Δu and Δw vary as
shown in the figure below:
U(+)...W(+)...
U(--)...W(+)...
Fig. 4-21
The contour between A and A' is determined in the block specified by address P
(G00 or G01). A move command in the X axis cannot be specified in this block.
The contour between A' and B has to show a steadily increasing and decreasing
pattern in both X and Z axes.
© SIEMENS AG 2007 All rights reserved
SINUMERIK 802D sl/840D sl840D/840Di sl/840Di/810D ISO Turning -- 04.07 Edition
A' A
B
A A
A
A
A'
B
B
Signs of numbers specified with U and W in stock removal in facing
Enhanced Level Commands
4.1 Program support functions (1)
+X
A'
U(+)...W(--)...
U(--)...W(--)...
A'
+Z +Z
4-107