Siemens Sinumerik 840D Operating Turning page 136

Section 4
Notes
B510
B510
Scaling of the coordinate system
In certain cases it may be important to alter the scale of the coordinate
system.
With this feature geometrically similar shapes of work piece can be pro-
grammed in various sizes, e. g. groups of parts or pattern construction with
different contraction allowances.
Scaling of the coordinate system
absolute, as referred to the active
work piece zero point
Here the values of "X" and "Z" are factors by which the coordinate system
is to enlarge or diminish.
If the scaling factors are entered differently for each axis a distorted co-
ordinate system will result.
Note:
Please note that the turning of tolerance dimensions after the scaling can
create difficulties since the tool wear correction vales are not any longer
operative 1:1.
Programming example:
N10 G18 G54
N20 G00 X200 Z300
...
N40 SCALE X0.5 Z0.5
N50 G00 X44 Z0
Z0, ...
Caution!
Physically the tool moves to X22!!!
Scaling of the coordinate system additive,
as referred to the active work piece zero point,
or to the currently valid coordinate system
selected with Frames
Programming example:
N10 G18 G54
N20 G00 X200 Z300
N30 TRANS Z-10
...
N40 ASCALE X0.5 Z0.5
Page 6
Code SCALE X... Z...
Explanation:
Turning plane G18 and zero point G54
activated,
The scale is halved for both axes,
Rapid traverse motion to contour point X44
Code ASCALE X... Z...
Explanation:
Zero point offset to Z-10
The scale halving in both axes from N30
remains operative
840D/828D SINUMERIK Operate