2.8.24 PROGRAM MIRROR IMAGE (G 68, G 69~
Program
mirror image is the feature to reverse
the NC program operation in all directions
around the work center line (Z-axis) by the use
of G command.
(1)
(2)
a.
b.
c.
d.
e.
f.
!3.
G68; . . .
G69; “-”
Program mirror image on.
The program mirror image on
state is held until G 69 is speci–
fied.
Program mirror image off.
The program mirror image off
state is held until G68 is speci–
fied.
When program mirror image is on, the X-
axis operation by the NC program IS in-
verted with Z-axis being the center line.
The manual operations (manual continuous
feed and handle /step feed) are not affected
by this feature.
Details of program mirror image
When the PROGRAM mirror image feature is
on, the movement by the NC program is
inverted with Z-axis ‘being the center line.
The following inversion is processed in the
NC unit:
X command for X-axis coordinate value is
inverted.
U command for X-axis incremental coordinate
value is inverted.
I command for x -axis coordinate value of
arc center is inverted.
Circular motion direction inverted.
{ PROGRAMMED CIRCULAR ARC
DIRECTION OF ROTATION
G 02”.
‘..-
CHANGED
TO G 03
f
CIRCULAR ARC ROTATIONAL
OIRECTION OF ROTATION
WITH PROGRAM MIRROR IMAGE
FEATURE ON
Fig. 2.39
I command for X-axis beveling/rounding
volume and direction is inverted.
I command for canned cycle taper X–axis
distance is inverted.
U and I commands for special canned cycles
finishing allowance, etc. are inverted.
h. The operational direction after X-axis tool
position compensation is inverted.
i. T command for tool nose radius compensa–
tion tool nose center is inverted in the sign.
~.
G command for tool nose radius compensa-
tion virtual tool nose position is inverted.
1
tilRTUAL TOOL NOS’?
?rogrammeo !00
rad]us com~en sation
Tool center
,, .,,,
T-, ..,..
Wrtual 1001 r ose
G 41
.
VIRTUAL TOGL NOSE
P
‘OOL
COm PellSatlOfl T.
CENTER
and tool center
u
.
G44 when PROGRAM
m,rr Or Image fumt,o”
m 0.
Fig. 2,40
92
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