Mitsubishi Electric MELDAS 600M Series Instruction Manual page 362

< Example of a machining program in which the mirror image center shifts >
(b) Incremental commands after the mirror image is canceled
When the mirror image is canceled at a point other than the mirror image center, the current
position and machine position will be in a shifted state as shown in the following drawing. To
return this state to normal, carry out a return process to the external switch mirror image or
parameter OFF position.
Because of this, the current position counter (2) in the cycle start may change greatly.
Cancel the mirror image at the mirror image center, or issue an absolute value positioning or
zero point return command (G28, G30) once after canceling the mirror image.
The mirror state in the NC can be confirmed with the "MR" display.
Axes displayed with a "MR" are handled in the NC as having the mirror image applied. This is so
the MIRROR IMAGE switch ON/OFF can be monitored.
The "MR" display disappears when the MIRROR IMAGE switch is turned OFF and the CYCLE
START is pressed.
< Movement to the mirror center >
X axis mirror
image ON
X axis mirror
image OFF
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CHAPTER 2 MACHINE OPERATIONS
6. Operation Switch Functions and Other Functions
G90 G0 X0 Y0 ;
G1 X___ Y___ ;
:
X−100. Y0 ;
M02 ;
Mirror image OFF
Path with the mirror image
N2'
applied
N1 G91 G00 X250. Y50. ;
N2
G01 X−100. Y100. ;
N3
N4 X100. Y100. ;
M02 ;
search engine
................................... A positioning point
................................... B end point
................................... NC reset
N4'
N4
N3'
N3
N2
N1
N1'
Mirror image OFF
Current position
X axis
−250. MR
−150. MR
−150. MR
Y200. ;
−50
II – 29
Change in the current position
(2) counter
Program path
Current position (2)
Y axis X axis
50. 250.
150. 150.
350. 150.
450. 50.
Y axis
50.
150.
350.
450.