Siemens Sinumerik 840D sl Programming Manual page 49

Scaling along each individual axis with different scaling factors
G51 X... Y... Z... I... J... K... ; Start scaling
G50; Deselection of scaling
X, Y, Z: Reference point of scaling (absolute command)
I, J, K: Scaling factor for the X-, Y- and Z-axis
The type of the scaling factor depends on MD22914 $MC_AXES_SCALE_ENABLE.
$MC_AXES_SCALE_ENABLE = 0:
The scaling factor is specified with "P". If "I,J,K" is programmed in this setting, the setting
data 42140 $SC_DEFAULT_SCALE_FACTOR_P is used for the scaling factor.
$MC_AXES_SCALE_ENABLE = 1:
The scaling factor is specified with "I,J,K". If only "P" is programmed in this MD setting, the
setting data 43120 $SA_DEFAULT_SCALE_FACTOR_AXIS is used for the scaling factors.
Weighting of scaling factors
The scaling factors are multiplied either with 0.001 or 0.00001. The factors are selected with
MD22910 $MC_WEIGHTING_FACTOR_FOR_SCALE=0, scaling factor 0.001,
$MC_WEIGHTING_FACTOR_FOR_SCALE=1, scaling factor 0.00001.
The workpiece zero is always the reference point for the scaling. A reference point cannot be
programmed.
Programmable mirroring (negative scaling)
A mirror image can be created with a negative value of the axial scaling factor.
To do this, MD22914 $MC_AXES_SCALE_ENABLE = 1 must be active. If I, J or. K is
omitted from the blocks with G51, the values preset in the setting data 43120
$SA_DEFAULT_SCALE_FACTOR_AXIS are activated.
Example
_N_0512_MPF
N01 G291
N10 G17 G90 G00 X0 Y0
N30 G90 G01 G94 F6000
N32 M98 P0513
N34 G51 X0. Y0. I-1000 J1000
N36 M98 P0513
N38 G51 X0. Y0. I-1000 J-1000
N40 M98 P0513
N42 G51 X0. Y0. I1000 J-1000
N44 M98 P0513
N46 G50
N50 G00 X0 Y0
N60 M30
ISO Milling
Programming Manual, 06/09, 6FC5398-7BP10-1BA0
3.2 Defining the input modes of the coordinate values
;(Part program)
;Start position for the approach motion
;1) Contour programmed as in the subroutine
;2) Contour, mirrored on X
;3) Contour, mirrored on X and Y
;4) Contour, mirrored on Y
;Deselection of scaling and mirroring
Motion commands
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