2.8, 25.2 Stock Removal in Turning (G71)
Stock removal in turning with the finishing allow-
tween
ante remained uncut can be commanded by G71.
caved
Commands for finished contour are different be-
monotonous increase /decrease and con-
shaped path.
(1) Monotonous
shape
G71
Nns . . . . . ;
. . . . . .
F
. . . . .
;
s
. . . . .
;
. . . . .
Nnf . . . . . ;
–x
increase /decrease finishing
ns: Sequence number for cycle start
I
Pns
I--nf ’
—
Sequence number for cycle finish
—
—
1~.,. K*. . . D.. .
F(E) . . . S.. . ;
T_TT__’l==_
Feedrate and spindle-speed
designation for stock removal
in turning
Depth of cut in X-axis direction
(designation without signs)
Rough finishing allowance in Z–axis direction
Rough finishing allowance in X-axis direction
(radius designation)
I
Finishing allowance in the
I
direction of Z-axis
Finishing allowance in the direction of
X-axis (diameter designation)
Note: Feed command F(E)
Finishing shape program (45 blocks maximum)
and spindIe command (S)
Tool path:
A+ A’+B
Sequence number should start with ns and end with nf.
F and S commands are effective only when G 70 finishing
cycle is executed.
are
given for executing
stock removal cycle.
I
(Relractlng)
~-r
E&x
“ --------
A
D
L-,
‘\
Start and f(n!sh
~\
at posjt!on A
\*
-1
~_ ! !~I
1
---
ING AL
I*
““’’N’E’-t-H-H-----
+Z
Flnlshlng shape
program
Stock removal
cycle
Rough fln!sh[ng
cvcle
Fig. 2.42
G 71 starts at point A, executes rough
finish
cycle (—) and the rough finishing
cycle (–--) ,
and returns to point A to be
terminated.
In the case
of I = O and K = O (or no
designation) , the rough finishing cycle is
omitted.
(Retrac:ng)
+x
/
Q
~
B
‘4
3
D
x
FINISHING
ALLOWANCE
3;
‘
I
!-4
w
+2
Fig. 2.43
Retracting is performed by rapid traverse
GOO.
Thrust motion depends on the speed
(GOO or GO1) specified by the program of
AA’.
Each depth of cut D along X-axis can
be overrided by 10% step within the range
of O to 200%, by G711G72 cut depth over–
ride selection or setting .
See item (3) , g.
95
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