Siemens SINUMERIK 840DE Programming Manual page 238

Frames
6.7 Programmable mirroring (MIRROR, AMIRROR)
N10 G17 G54
N20 L10
N30 MIRROR X0
N40 L10
N50 AMIRROR Y0
N60 L10
N70 MIRROR Y0
N80 L10
N90 MIRROR
N100 G0 X300 Y100 M30
Example of rotating mirroring
The actual machining is stored as a subprogram and the execution at the respective spindles
is done by means of mirrorings and offsets.
6-30
;Working plane X/Y, workpiece zero
;Machine first contour, top right
;Mirror X axis (the direction is changed in
;X)
;Machine second contour, top left
;Mirror Y axis (the direction is changed in
;Y)
;Machine third contour, bottom left
;MIRROR cancels previous frames. Mirror
;Y axis (the direction is changed in Y)
;Machine fourth contour, bottom right
;Deactivate mirroring
;Retraction, end of program
Programming Manual, 10.2004 Edition, 6FC5 298-7AB00-0BP1
Fundamentals