CHAPTER 2 MACHINE OPERATIONS
6. Operation Switch Functions and Other Functions
II
– 29
< Example of a machining program in which the mirror image center shifts >
G90 G0 X0 Y0 ;
................................... A positioning point
G1 X___ Y___ ;
:
X
−
100. Y0 ; ................................... B end point
M02 ;
................................... NC reset
(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.
N4
N3
N2
N1
N4'
N3'
N2'
N1'
Mirror image OFF
Change in the current position
(2) counter
Path with the mirror image
applied
Program path
Mirror image OFF
< Movement to the mirror center >
Current position
Current position (2)
X axis
Y axis
X axis
Y axis
X axis mirror
image ON
N1
N2
N3
G91 G00 X250. Y50. ;
G01 X
−
100. Y100. ;
Y200. ;
−
250. MR
−
150. MR
−
150. MR
50.
150.
350.
250.
150.
150.
50.
150.
350.
X axis mirror
image OFF
N4 X100. Y100. ;
M02 ;
−
50
450.
50.
450.
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Содержание MELDAS 600M Series
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