(3)
a.
b.
c.
d.
e.
Cautions for G68 and G69 commands
G68 and G69 are modal G commands which
belong to “ 10” group. They must be speci-
fied on a single block basis, in principle.
G69 (program mirror image off) is used at
the time of power-on, reset operation, and
program reset.
These commands must be specified in the
tool nose radius compensation cancelled
state.
These commands may not be specified in the
finishing shape program of the special canned
cycle.
If automatic origin return “G28 X. . . Z. . . ; “
is specified whe–n the X–axis mirror image
feature is on,
the positioning of the inter-
mediate point specified in X and Z is affect–
ed by the mirror image, but the machine
origin, which is an absolute position, is not
affected by this feature.
+x
G28X...:...:
7
,-----\
/
t
ABSOLUTE
\___
/’
—---
ZERO
/’
POINT
/’
PROGRAMMED iNTER-
MEDIATE POINT
u
INTERMEDIATE POINT PRODUCED
BY X-AXIS MIRROR IMAGE FEATURE
Fig. 2.41
EXAMPLE :
Described below is a sample program which
uses G68 and G69 for the opposed tool rest
shown in the diagram on the following page,
and the X-axis movements.
Power on
+
Manual reference point return
+
Program execution
NOOO1 G50 x240. Z220. ;
N0002 X40. Z120. TO1O1
— 240.000 1
; —96.000 u-144.000
NO003 G68 ;
-96.000
NOO04 G50 U480. ;
+384. 000
NOO05 x80. z80. Tllll ;— +144.000
u240. 000
NOO06 G69 : — -144.000
N0007 G50 u480. ;
336.000
NOO08 x120. z40. TO1O1 ;—176.000
u-160.000
x
L
220
OFFSET 01 X56.
28
A TURRET
F
T 01
4
B TURRET
OFFSET 11 X64
Z 8.
—+Z
93
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