Siemens SINUMERIK 840D sl Programming Manual page 321

Prerequisites and restrictions
1. It is not possible to switch the geometry axes over during:
2. If the geometry axis and the channel axis have the same name, it is not possible to
3. None of the axes involved in the switchover can be involved in an action that might
4. The GEOAX command can only be used to replace geometry axes that already existed at
5. Using GEOAX for axis replacement while preparing the contour table (CONTPRON,
Description
Geometry axis number
In the command GEOAX(n,channel axis...) the number n designates the geometry
axis to which the subsequently specified channel axis is to be assigned.
Geometry axis numbers 1 to 3 (X, Y, Z axis) are permissible for loading a channel axis.
n = 0 removes an assigned channel axis from the geometry axis grouping without
reassigning the geometry axis.
After the transition, an axis replaced by switching in the geometry axis grouping is
programmable as a special axis via its channel name.
Switching over the geometry axes deletes all the frames, protection zones and operating
range limits.
Polar coordinates
As with a change of plane (G17-G19), replacing geometry axes with GEOAX sets the modal
polar coordinates to the value 0.
DRF, NPV
Any existing handwheel offset (DRF) or an external zero offset, will stay active after the
switchover.
Job planning
Programming Manual, 03/2006 Edition, 6FC5398-2BP10-1BA0
– an active transformation,
– an active spline interpolation,
– active tool radius compensation (see PG Fundamentals, section "Tool compensation")
– active fine tool compensation (see PG Fundamentals, section "Tool compensation")
change the particular geometry axis.
persist beyond the block limits, as is the case, for example, with positioning axes of type
A or with following axes.
power ON (i.e. no newly defined ones).
CONTDCON) produces an alarm.
7.13 Replaceable geometry axes (GEOAX)
Transformations
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