2.8.25.3 Stock Removal in Facing (G 72) (Cent’d)
(2) Concaved finishing shape
r
ns:
Cycle start sequence number
r
nf:
Cycle finish sequence number
G72 Pns Qnf W~...
Kf. .. D.. .
F(E) ... S.. . R1. .. ;
Nns ........ .
;~ ~T
T
(See Note 1.)
........
Depth of cut in Z–axis direction
;
F
(without signs )
...... .
s
......
Rough finishing allowance
in Z-axis direction
........
;
Nnf ........ .
Finishing allowance in Z–axis direction
Finishing shape program (45 blocks maximum)
Tool pat~ :
A- +- AI-+ B
Note 1:
If “R1” is specified,
cutting path is com-
puted for the- concaved finishing shape program.
A
FINISHED SHAPE
— PROGRAM
A’
‘— ROUGH CUTTING
_---- ROUGH FINISH
CYCLE
FINISH ALLOWANCE
ROUGH CUTTING
ALLOWANCE
-x
L.:
I
L1l-1
,
‘\ +
~.
‘4
-z
‘~M
R
K
D
RETRACT
MOTION
G 72 starts at point A , performs stock re–
) and rough finishing cycle
moval cycle (-
(---), and returns to point A when com-
pleted.
If K is not specified, rough finish-
ing cycle is skipped. Retracting is per-
formed by rapid traverse GOO. Cutting
rate depends on the speed (GOO or GO1)
specified by the program of AA’.
b. Cautions of concaved finishing shape pro-
gram
G 72 only performs the operations which are
parallel to Z axis.
The same cautions as
with G71 are applied to G72 except that the
retracting amount of G72 may be set by
setting #6203.
(3) Cautions for G 72 command
The same cautions as with G71 are applied
to G72.
EXAMPLE :
In case of I = K = O, tool nose radius
compensation is not applied.
–x
i
mm (1))
I
m
160.
LMA
I
I 1
I
-,.
I
t-l
E-ach depth-of cut D along X-axis can be
overrided by 10% step within the range of
O to 200%, by G71/G72 cut depth override
selection or setting.
102
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