Siemens Sinumerik 802D sl Programming Manual page 102

Enhanced Level Commands
4.1 Program support functions (1)
Stock removal cycle, longitudinal axis (G71)
By using the multiple repetitive cycles, programming steps can be considerably
reduced due to the features that both rough and finish cutting cycles can be execu-
ted by simply defining the finishing shape, and the like.
There are two types of stock removal cycles.
Type I
The specified area is removed by Δd (infeed depth for stock removal) with finishing
allowances Δu/2 and Δw left over, whenever a contour of A to A' to B is described
by an NC program.
Fig. 4-15
Format
G71 U... R... ;
U: Infeed depth for stock removal ( Δd), radius designation
This value is modal and can also be preset using GUD7, _ZSFI[30]. The value set
here can be overwritten by the NC program command.
R: Retraction amount (e)
This value is modal and can also be preset using GUD7, _ZSFI[31]. The value set
here can be overwritten by the NC program command.
G71 P... Q... U... W... F... S... T...
4-102
B
(F)
45°
Program command
(F): Cutting feed
(R): Rapid traverse
Cutting path in stock removal in turning (type I)
SINUMERIK 802D sl/840D sl840D/840Di sl/840Di/810D ISO Turning -- 04.07 Edition
C
(R)
A
(R)
e
(F)
A'
Δw
© SIEMENS AG 2007 All rights reserved
04.07
Δd
Δu/2