Mitsubishi Electric MELDAS 600M Series Instruction Manual page 361

(4) Precautions
(a) Reset and mirror image cancel
The mirror image center is canceled by the NC reset (including M02, M30 internal resets). The
next time the mirror image center will be established is when an automatic start is carried out.
This operation enables the mirror image center to be changed with the mirror image ON using a
simple operation, so that another shape can be machined after the machining finishes.
Be sure to move the axis to the mirror image center with the manual handle, etc. before carrying
out an automatic start when restarting the same machining program.
Be sure the final command M02 (or M30) position is at the mirror image center (program start
position) when repeating the same machining program.
< Program example when repeating the program >
If the NC is reset at a point other than the mirror image center, and the same machining program
is restarted, the mirror image center will move to that location. The coordinate system will shift.
If the machining program is repeated without returning to the mirror image center (program start
position), the positioning point shifts from A1 → A2 → A3 as shown in the following drawing, and
does not go to the desired position. This means the end point shifts from B1 → B2 → B3. At this
point the M02 reset and automatic start is carried out, because the mirror image center moves
from MR1 → MR2 → MR3.
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CHAPTER 2 MACHINE OPERATIONS
6. Operation Switch Functions and Other Functions
Program shape
NC reset during operation
G90 G0 X0 Y0 ;
X___ Y___ ;
:
G0 X0 Y0 ;
M02 ;
1st time
Machining program
A1
B
A
M
MR1
search engine
NC reset
Re tur n t o the mi rro r c ent er.
Mirror image center
................................... Program start position
................................... Return to program start position.
................................... NC reset
2nd time
B2
B1 A2
MR2
MR3
II – 28
3rd time
A3 B3